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Assembly Source File | 1990-01-04 | 64KB | 1,756 lines

TITLE PCREMOTE - Unattended Computer Access - 1989 by Terry Lahman PAGE 60,132 ;====================================================================== ; ; PCREMOTE - An unattended computer access utility. Allows access to an ; unattended computer from a manned computer. The unattended computer ; executes the TSR portion of the program and waits for the manned ; computer to call. For use with text only programs. Like using the ; phone lines and modems as a long extension cord for your keyboard ; and monitor. ; ; Usage: PCREMOTE [ /M ] [ /2 ] [ /F ] [ /D ] ; ;====================================================================== CSEG SEGMENT PARA PUBLIC 'CODE' ASSUME CS:CSEG,DS:NOTHING,ES:NOTHING,SS:NOTHING BS EQU 8 CR EQU 13 LF EQU 10 SPACE EQU 32 ;---------------------------------------------------------------------- ; Start of code ;---------------------------------------------------------------------- ORG 100H ;Starting offset for .com START: JMP INITIALIZE ;Jump over resident code ;---------------------------------------------------------------------- ; Data storage ;---------------------------------------------------------------------- COPYRIGHT DB "PCREMOTE Version 1.0 (c) 1989 Ziff Communications Co." DB CR,LF,"PC Magazine ",254," by Terry Lahman",CR,LF,"$",26 CONNECT_FLAG DB 0 ;0=not connected ;1=connected to manned system ACT_FLAG DB 0 ;0=unattended prog not active ;1=unattended program is active ; do not run again OLDINT_8 DW 0,0 ;Old timer vector MANNED_FLAG DB 0 ;0=Operate in unattended mode ;1=Operate in manned mode COMM_FLAG DB 0 ;0=Use COM1 ;1=Use COM2 COMM_PORT DW 0 ;Comm port address COMM_INT_STA DB 0 ;Comm port interrupt status ;0=not transmitting data ;1=transmitting data SPEED_FLAG DB 0 ;0=Use 1200 baud ;1=Use 2400 baud DESNOW_FLAG DB 0 ;0=Do not use desnow code ;1=Use desnow code VIDEO_COPY DW 0 ;Address of video ram copy VIDEO_SEGMENT DW 0 ;Segment register for vid ram SHIFT_STATUS DB 0 ;Current status of shift byte STACK_TOP DW INITIALIZE+256D ;Top of stack for unattended OLD_SS DW 0 ;Old stack segment OLD_SP DW 0 ;Old stack pointer TEMP_REG DW 0 ;Temp storage for register CURSOR_POSITION DW 0 ;Old cursor position VID_RAM_OFFSET DW 0 ;Current compare offset ASCII_FLAG DB 0 ;0=no data is pending ;1=received a FE ;2=received ASCII char ;4=received scan code SHIFT_FLAG DB 0 ;0=no data is pending ;1=received a FD KEY_ONE DB 0 ;ASCII char received KEY_TWO DB 0 ;Scan code received BAUD_RATE DB 0,60H ;1200 BAUD divisor MSB LSB DB 0,30H ;2400 BAUD divisor MSB LSB IN_BUFF_SIZE EQU 512D ;Size for input buffer OUT_BUFF_SIZE EQU 512D ;Size for output buffer IN_BUFF_HEAD DW ? ;Pointer to input buffer head IN_BUFF_TAIL DW ? ;Pointer to input buffer tail IN_BUFF_BEGIN DW ? ;Pointer to input buffer begin IN_BUFF_END DW ? ;Pointer to input buffer end OUT_BUFF_HEAD DW ? ;Pointer to output buffer head OUT_BUFF_TAIL DW ? ;Pointer to output buffer tail OUT_BUFF_BEGIN DW ? ;Pointer to output buffer begin OUT_BUFF_END DW ? ;Pointer to output buffer end BLOCK_SIZE EQU 16D ;Block transfer size in words BLOCK_SIZEX2 EQU BLOCK_SIZE*2 ;Block transfer size in bytes BLOCK_COUNT DB ? ;Block number being processed BLOCK_POINTER DW 0 ;Points to current video block TEMP_VIDEO_PTR DW ? ;Pointer to temp video storage CR_COUNT DB ? ;Number of CRs for speed sync MODEM_ATTENTION DB CR,"AT",CR,0 MODEM_SETUP1 DB "ATE0 S12=40 Q0 V0 X1 S0=0",CR,0 ;Manned MODEM_SETUP2 DB "ATE0 S12=40 Q1 S0=2",CR,0 ;Unattended MODEM_SETUP3 DB "AT&C1",CR,0 ;Enable DCD on 2400 baud modem MODEM_HANGUP DB "ATH0",CR,0 MODEM_ESCAPE DB "+++",0 TONE_DIAL DB "ATDT",0 ;Tone dial command PASS_MESSAGE DB "Enter password:",0 ;Enter password message PASSWORD_SIZE DW EXTRA_PW_SPACE-PASSWORD PASSWORD DB "PC MAGAZINE" EXTRA_PW_SPACE DB 20-(EXTRA_PW_SPACE-PASSWORD) DUP(?) PASSWORD_BUFFER DB 20 DUP(?) EXIT_CODE DB 0,45D ;alt-x, code to exit program ;====================================================================== ; Interrupt handlers. Interrupt 8 is used in unattended mode only. ; The communications interrupt is used in both modes. ;====================================================================== ;---------------------------------------------------------------------- ; Interrupt 8 handling routine. If program is already active do not run. ; Run connect unattended if not connected, otherwise run unattended. ;---------------------------------------------------------------------- INT8 PROC NEAR ASSUME CS:CSEG,DS:CSEG,ES:NOTHING,SS:NOTHING PUSH DS ;Save data segment PUSH CS ;Set data segment to code seg POP DS PUSHF ;Call old int 8 CALL DWORD PTR OLDINT_8 I8_10: CLI ;Disable interrupts CMP BYTE PTR ACT_FLAG,0 ;Check for program active JNZ I8_EXIT ;Exit if progam is active INC BYTE PTR ACT_FLAG ;Set program active flag STI ;Enable interrupts CALL SET_STACK ;Create stack & save registers CMP BYTE PTR CONNECT_FLAG,0 ;Connected to manned? JNZ I8_20 ;Yes, then run unattended CALL CONNECT_UNATTENDED ;No, check for connection JMP I8_30 I8_20: CALL UNATTENDED ;Run unattended I8_30: CALL RESET_STACK ;Restore registers & stack DEC BYTE PTR ACT_FLAG ;Clear program active flag I8_EXIT: STI ;Enable interrupts POP DS ;Restore data segment IRET INT8 ENDP ;---------------------------------------------------------------------- ; Interrupt handling routine for communications interrupt. Provides ; interrupt driven I/O. Transmit or receive a character. ;---------------------------------------------------------------------- INT_COMM PROC NEAR ASSUME CS:CSEG,DS:CSEG,ES:NOTHING,SS:NOTHING PUSH DS ;Save data segment PUSH DX ;Save registers PUSH BX PUSH AX PUSH CS ;Set data segment to code seg. POP DS MOV DX,COMM_PORT ;Get port base address INC DX ;Point to int. id reg. INC DX IN AL,DX ;Get the interrupt id byte IC_10: CMP AL,2 ;Transmit empty int? JZ IC_40 ;Yes transmit a byte ; ; received data, get it and store in buffer ; DEC DX ;Port base address DEC DX IN AL,DX ;Get data from receive register MOV BX,IN_BUFF_TAIL ;Get the buffer tail pointer MOV [BX],AL ;Store the data in buffer INC BX ;Point to next data storage CMP IN_BUFF_END,BX ;Beyond end of buffer area? JNE IC_20 ;No, then don't reset MOV BX,IN_BUFF_BEGIN ;Yes, reset to buffer begin IC_20: CMP BX,IN_BUFF_HEAD ;Test for buffer full JE IC_30 ;If so,don't change ptr ,sorry MOV IN_BUFF_TAIL,BX ;Save new tail pointer IC_30: JMP IC_70 ; ; transmit buffer empty, send a byte ; IC_40: DEC DX ;Port base address DEC DX MOV BX,OUT_BUFF_HEAD ;Get the buffer head pointer CMP BX,OUT_BUFF_TAIL ;Test for data in buffer JE IC_60 ;If the same, no data so exit MOV AL,[BX] ;Get the data INC BX ;Point to next data in buffer CMP OUT_BUFF_END,BX ;Beyond end of buffer area? JNE IC_50 ;No, then don't reset MOV BX,OUT_BUFF_BEGIN ;Yes, reset to buffer begin IC_50: MOV OUT_BUFF_HEAD,BX ;Save new head pointer OUT DX,AL ;Send the data out the port JMP IC_70 ;Check for request pending IC_60: MOV BYTE PTR COMM_INT_STA,0 ;Reset transmitting data flag IC_70: INC DX ;Point to int. id reg. INC DX IN AL,DX ;Get the interrupt id byte TEST AL,1 ;Request pending? JZ IC_10 ;Yes, then process IC_EXIT: MOV AL,20H ;Reset 8259 OUT 20H,AL STI ;Enable interrupts POP AX ;Restore registers POP BX POP DX POP DS ;Restore data segment IRET INT_COMM ENDP ;---------------------------------------------------------------------- ; Create stack area and save all registers. ;---------------------------------------------------------------------- SET_STACK PROC NEAR ASSUME CS:CSEG,DS:NOTHING,ES:NOTHING,SS:NOTHING MOV TEMP_REG,BX ;Save BX POP BX ;Save the return address PUSH AX ;Save AX ; ; make my own stack ; CLI ;Disable interrupts MOV AX,SS ;Put old stack segment in AX MOV OLD_SS,AX ;And save it MOV AX,SP ;Put old stack pointer in AX MOV OLD_SP,AX ;And save it MOV AX,CS ;Get current segment MOV SS,AX ;And put into stack segment MOV AX,STACK_TOP ;Get top of stack address MOV SP,AX ;And put into stack pointer STI ;Enable interrupts ; ; save all the registers on the stack ; PUSH CX PUSH DX PUSH SI PUSH DI PUSH DS PUSH ES PUSH BP MOV AX,CS ;Get code segment MOV DS,AX ;Set data segment to code seg MOV ES,AX ;Set extra seg to code seg PUSH BX ;Restore return address RET SET_STACK ENDP ;---------------------------------------------------------------------- ; Restore all registers and reset stack ;---------------------------------------------------------------------- RESET_STACK PROC NEAR ASSUME CS:CSEG,DS:NOTHING,ES:NOTHING,SS:NOTHING POP BX ;Save return address ; ; restore the registers ; POP BP ;Restore the registers POP ES POP DS POP DI POP SI POP DX POP CX ; ; restore the original stack ; CLI ;Disable interrupts MOV AX,OLD_SP ;Get old stack pointer MOV SP,AX ;And restore it MOV AX,OLD_SS ;Get old stack segment MOV SS,AX ;And restore it STI ;Enable interrupts POP AX ;Restore AX PUSH BX ;Put return add back on stack MOV BX,TEMP_REG ;Restore BX RET RESET_STACK ENDP ;====================================================================== ; The unattended routine will execute the connect routine to establish ; a connection with the manned system. Once connected it will execute ; the unattended routine to process incoming data and send any changed ; video data to the manned system. ;====================================================================== ;---------------------------------------------------------------------- ; CONNECT_UNATTENDED - Check for ring codes, answer the phone and check ; the password. If correct, set connected flag. ;---------------------------------------------------------------------- CONNECT_UNATTENDED PROC NEAR ASSUME CS:CSEG,DS:CSEG,ES:CSEG,SS:NOTHING MOV BP,SP ;Save stack pointer for exit CALL CHECK_CARRIER ;Test for carrier present JNZ CU_10 ;Yes then check baud rate JMP CU_EXIT ;No, then exit routine CU_10: CALL CLEAR_INBUFF ;Clear the input buffer XOR AH,AH ;Use input buffer MOV CX,10D ;Number of char to check for CR MOV BYTE PTR CR_COUNT,5 ;Number of matches required CU_20: CALL CHECK_CARRIER ;Check for carrier loss JNZ CU_30 JMP IP_50 ;Carrier loss, reset and exit CU_30: CALL GET_BUFF_DATA ;Try to get data from buffer JNC CU_20 ;Wait till their is data CMP AL,CR ;Check for CR code JNZ CU_40 ;No so skip over DEC BYTE PTR CR_COUNT ;Found a match dec count JZ CU_50 ;5 out of ten then 2400 baud CU_40: LOOP CU_20 ;Keep trying XOR AL,AL ;No 5 out of 10, try 1200 baud CALL SET_BAUD_RATE JMP CU_10 ;Now wait for CR at 1200 baud CU_50: MOV BYTE PTR CONNECT_FLAG,1 ;Set connect flag MOV CX,3 ;3 tries to enter password CU_60: MOV SI,OFFSET PASS_MESSAGE ;Point to enter password mess. CALL LOAD_ZSTRING ;Load it into output buffer CALL GET_PASSWORD ;Get the password CALL CHECK_PASSWORD ;Check the password sent JZ CU_70 ;Jump if correct LOOP CU_60 ;Keep trying MOV AL,1 ;Use setup string 2 CALL RESET_MODEM ;Hangup and reset modem JMP CU_EXIT ;Done, so exit CU_70: MOV AH,1 ;Use output buffer XOR AL,AL ;Sync byte to send MOV CX,5 ;Send 5 of them CU_80: CALL PUT_BUFF_DATA ;Send them LOOP CU_80 CU_EXIT: RET CONNECT_UNATTENDED ENDP ;---------------------------------------------------------------------- ; Get the password from the manned system ; Input - Nothing ; Output - Password buffer contains password from manned system ; Changes - DI, AX ;---------------------------------------------------------------------- GET_PASSWORD PROC NEAR ASSUME CS:CSEG,DS:CSEG,ES:CSEG,SS:NOTHING PUSH CX ;Save register MOV DI,OFFSET PASSWORD_BUFFER ;Point to password buffer MOV CX,20D ;Zero buffer to clear previous XOR AL,AL ; password CLD REP STOSB MOV DI,OFFSET PASSWORD_BUFFER ;Pointer to buffer MOV CX,20D ;Maximum password size GP_10: CALL CHECK_CARRIER ;Check for carrier loss JNZ GP_20 JMP IP_50 ;Carrier loss, reset and exit GP_20: CALL INPUT_PROCESSING ;Get data & put in keybd buffer CALL GET_KEYSTROKE ;Check for keystroke JZ GP_10 ;None, so wait CMP AL,60H ;Check for lower case JL GP_30 ;No then leave it alone AND AL,5FH ;Convert to upper case GP_30: CMP AL,CR ;If it is a CR then exit JZ GP_EXIT CMP AL,BS ;Is it a back space? JNZ GP_40 ;No, so save it INC CX ;Resetcounter for BS CMP DI,OFFSET PASSWORD_BUFFER ;Already at start of buffer? JZ GP_60 ;Yes, then don't backspace DEC DI ;Backspace buffer pointer MOV BYTE PTR [DI],0 ; and null the data JMP GP_50 GP_40: CLD ;Forward STOSB ;Save the character MOV AL,'*' ;Echo character GP_50: MOV AH,1 ;Use output buffer CALL PUT_BUFF_DATA ; and store the character GP_60: LOOP GP_10 ;Receive up to CX characters GP_EXIT: POP CX ;Restore register RET GET_PASSWORD ENDP ;---------------------------------------------------------------------- ; Check the password in the buffer with correct password ; Input - Nothing ; Output - Zero set - correct password ; Zero reset - Wrong password ; Changes - SI, DI ;---------------------------------------------------------------------- CHECK_PASSWORD PROC NEAR ASSUME CS:CSEG,DS:CSEG,ES:CSEG,SS:NOTHING PUSH CX ;Save register MOV SI,OFFSET PASSWORD_BUFFER ;Pointer to buffer MOV DI,OFFSET PASSWORD ;Pointer to password MOV CX,PASSWORD_SIZE ;Number of compares to make CLD ;Compare forward REPZ CMPSB ;Repeat while passwords match POP CX ;Restore register RET CHECK_PASSWORD ENDP ;---------------------------------------------------------------------- ; UNATTENDED - Process incoming data and check for changes in video ; data, format and send to manned system. Maintains 18 or less characters ; in output buffer, ensures maximum throughput. ;---------------------------------------------------------------------- UNATTENDED PROC NEAR ASSUME CS:CSEG,DS:CSEG,ES:CSEG,SS:NOTHING MOV BP,SP ;Save stack pointer for exit CALL INPUT_PROCESSING ;Process any buffered data MOV AX,OUT_BUFF_HEAD ;Get the head pointer MOV BX,OUT_BUFF_TAIL ;Get the tail pointer MOV CX,18D ;Check for bytes in buffer UA_10: CMP AX,BX ;Less than 18 bytes in buffer JZ UA_30 ;Yes, then compare video INC AX ;Increment head pointer CMP OUT_BUFF_END,AX ;Beyond end of buffer area? JNE UA_20 ;No, then don't reset MOV AX,OUT_BUFF_BEGIN ;Yes, reset to buffer begin UA_20: LOOP UA_10 ;Check all 18 bytes JMP UA_EXIT ;More than 18, exit UA_30: MOV VID_RAM_OFFSET,0 ;Start at address 0 MOV BYTE PTR BLOCK_COUNT,0 ;Reset block counter ; ; compare the video copy with the video ram ; UA_40: PUSH DS ;Save data segment MOV SI,VID_RAM_OFFSET ;Get the current offset MOV DI,TEMP_VIDEO_PTR ;Dest. ES:DI temp video buffer MOV AX,VIDEO_SEGMENT ;Get video Segment register MOV DS,AX ;Source DS:SI video RAM ; ; transfer block_size words of data from video RAM to the temp buffer ; MOV CX,BLOCK_SIZE ;Get count of words to transfer CLD CMP BYTE PTR CS:DESNOW_FLAG,0 ;Check desnow flag JZ UA_70 SAL CX,1 ;Convert words to bytes MOV DX,3DAH ;CGA status port UA_50: IN AL,DX ;Get status byte TEST AL,1 ;Test display enable JNZ UA_50 ;If in Hor. sync then wait CLI ;Disable interrupts UA_60: IN AL,DX ;Get status byte TEST AL,1 ;Test display enable JZ UA_60 ;Wait for Hor. sync MOVSB ;Transfer one byte STI ;Enable interrupts LOOP UA_50 ;Transfer block size words JMP UA_80 UA_70: REP MOVSW UA_80: POP DS ;Restore data segment ; ; compare the block from video RAM with the video copy ; MOV CX,BLOCK_SIZEX2 ;Number of words to compare MOV SI,TEMP_VIDEO_PTR ;Point to block of video data MOV DI,VIDEO_COPY ;Point to video copy ADD DI,VID_RAM_OFFSET ;Adjust for current block REPE CMPSB ;Compare while equal JNE UA_90 ;No match, format & send block MOV AX,VID_RAM_OFFSET ;Get current block pointer ADD AX,BLOCK_SIZEX2 ;Point to next block MOV VID_RAM_OFFSET,AX ;And save the pointer INC BYTE PTR BLOCK_COUNT ;Increment current block count CMP AX,4000D ;Check for end of video RAM JNZ UA_40 ;No, keep checking the RAM MOV VID_RAM_OFFSET,0 ;Yes, reset to begin of video JMP UA_100 ;Check for change in cursor ; ; data doesn't match, format and send to manned system ; UA_90: INC CX ;Adjust count AND CX,1 ;LSB indicates char or attr. CALL TRANSFER_BLOCK ;Prepare to send block of data ; ; Check for a change in the cursor position ; UA_100: MOV AX,40H ;Set ES to BIOS data segment MOV ES,AX MOV BX,ES:[50H] ;Get current cursor position CMP BX,CURSOR_POSITION ;Compare with copy JZ UA_EXIT ;No change, skip MOV CURSOR_POSITION,BX ;Save new cursor position MOV AL,0D2H ;Sync bits, set position MOV AH,1 ;Use output buffer CALL PUT_BUFF_DATA ;Send sync byte MOV AL,BL ;Low byte CALL PUT_BUFF_DATA MOV AL,BH ;High byte CALL PUT_BUFF_DATA UA_EXIT: RET UNATTENDED ENDP ;---------------------------------------------------------------------- ; Get data from the unattended input buffer and process ; Input - Nothing ; Output - Keyboard buffer or shift status is updated ; Changes - Nothing ;---------------------------------------------------------------------- INPUT_PROCESSING PROC NEAR PUSH AX ;Save register PUSH DX PUSH ES MOV AX,40H ;Set ES to BIOS data area MOV ES,AX IP_10: CMP BYTE PTR CONNECT_FLAG,0 ;Are we connected JZ IP_20 ;No, don't check carrier CALL CHECK_CARRIER ;Yes check for carrier loss JZ IP_50 ;Carrier loss, reset and exit IP_20: MOV AH,0 ;Use input buffer CALL GET_BUFF_DATA ;Get a byte of data JC IP_30 ;If data then process JMP IP_EXIT ;Otherwise exit ; ; Check to see if expecting ASCII data ; IP_30: CMP ASCII_FLAG,0 ;Check ASCII flag JZ IP_70 ;0=not expecting data here CMP ASCII_FLAG,1 ;Check for received 1st byte JNZ IP_40 ;Jump if second byte MOV KEY_ONE,AL ;Save scan code, byte one INC BYTE PTR ASCII_FLAG ;Indicate receiving one byte JMP IP_10 ;Process next byte IP_40: MOV KEY_TWO,AL ;Save ASCII code, byte two MOV AL,KEY_ONE ;Get ASCII code MOV AH,KEY_TWO ;Get scan code CMP AX,WORD PTR EXIT_CODE ;Check for exit code JNZ IP_60 ;No,then continue processing IP_50: ;Otherwise reset connect & exit CALL CLEAR_INBUFF ;Clear input buffer CALL CLEAR_OUTBUFF ;Clear output buffer MOV BYTE PTR COMM_INT_STA,0 ;Reset transmitting data flag CALL IU_10 ;reinit and reset modem CLI ;Disable interrupts MOV BYTE PTR CONNECT_FLAG,0 ;Reset the connect flag MOV BYTE PTR ASCII_FLAG,0 ;Reset ASCII flag MOV BYTE PTR SHIFT_FLAG,0 ;Reset shift flag MOV BYTE PTR ES:[17H],0 ;Reset any shift status MOV SP,BP ;Clean the stack RET ;And exit unattended routine IP_60: CALL PUT_KEY_DATA ;And stuff in keyboard buffer MOV BYTE PTR ASCII_FLAG,0 ;Reset ASCII flag for next data JMP IP_10 ;Process next byte ; ; Check to see if expecting shift data ; IP_70: CMP BYTE PTR SHIFT_FLAG,0 ;Check shift flag JZ IP_80 ;0=not expecting data here MOV ES:[17H],AL ;And save in shift status MOV BYTE PTR SHIFT_FLAG,0 ;Reset shift flag for next data JMP IP_10 ;Process next byte ; ; Check to see if it's a sync byte ; IP_80: CMP AL,0FEH ;Check for ASCII sync byte JNZ IP_90 ;If not then check for shift INC BYTE PTR ASCII_FLAG ;Indicate received FEh JMP IP_10 ;Process next byte IP_90: CMP AL,0FDH ;Check for shift sync byte JNZ IP_100 ;If not then throw away INC BYTE PTR SHIFT_FLAG ;Indicate received FDh IP_100: JMP IP_10 ;Process till buffer empty IP_EXIT: POP ES ;Restore registers POP DX POP AX RET INPUT_PROCESSING ENDP ;---------------------------------------------------------------------- ; Formats the data in temporary video buffer and puts it into the ; output buffer ; Input - CX=0 Transfer character data to output buffer ; CX=1 Transfer attribute data to output buffer ; Output - Nothing ; Changes - AX, BX, CX, SI, DI ;---------------------------------------------------------------------- TRANSFER_BLOCK PROC NEAR OR CX,CX ;Set flags JZ TB_10 ;Jump if character data MOV AL,0FFH ;Sync byte for attr. data JMP TB_20 TB_10: MOV AL,0FEH ;Sync byte for char. data TB_20: MOV AH,1 ;Use output buffer CALL PUT_BUFF_DATA ;Put sync byte in output buff. MOV AL,BLOCK_COUNT MOV AH,1 ;Use output buffer CALL PUT_BUFF_DATA ;Send the block number MOV SI,TEMP_VIDEO_PTR ;Point to block of video data ADD SI,CX ;Adjust for char. or attr. MOV DI,VIDEO_COPY ;Point to video copy ADD DI,VID_RAM_OFFSET ;Adjust for block offset ADD DI,CX ; and character or attribute MOV CX,BLOCK_SIZE ;Number of bytes to send CLD ;Forward direction TB_30: LODSW ;Get the unmatched data MOV AH,1 ;Use the output buffer CALL PUT_BUFF_DATA ;Put the video data in out buff STOSB ;Save video data in copy INC DI ;Adjust for word offset LOOP TB_30 ;Send block size bytes of data RET TRANSFER_BLOCK ENDP ;---------------------------------------------------------------------- ; Put a byte of data into the unattended keyboard buffer. ; Input - AL contains ASCII to be put into buffer. ; AH contains scan code to be put into buffer. ; Output - Carry Set - Byte placed in buffer successfully ; Carry Reset - Buffer full, byte not stored in buffer ; Changes - Nothing ;---------------------------------------------------------------------- PUT_KEY_DATA PROC NEAR PUSH BX ;Save registers PUSH SI PUSH DI MOV SI,1AH ;Point to keyboard head pointer CLI ;Don't allow interrupts MOV BX,ES:[1CH] ;Get the buffer tail pointer MOV DI,BX ;Save the tail pointer INC BX ;Point to next data storage INC BX CMP BX,3EH ;Beyond end of buffer area? JNE PK_10 ;No, then don't reset MOV BX,1EH ;Yes, reset to buffer begin PK_10: CMP BX,ES:[1AH] ;Test for buffer full JE PK_EXIT ;If the same, don't save it ; exit, carry is already reset MOV ES:[DI],AX ;Store the data in buffer MOV ES:[1CH],BX ;Save new tail pointer STC ;Indicate data stored OK PK_EXIT: POP DI POP SI POP BX STI ;Enable interrupts RET PUT_KEY_DATA ENDP ;====================================================================== ; COMMON ROUTINES - These routines are common to both the unattended ; processing portion of the program and the manned processing portion. ;====================================================================== ;---------------------------------------------------------------------- ; Get a byte of data from a buffer. Byte pointed to by head pointer is ; is next data byte. If head=tail, no data in buffer. ; Input - AH - Buffer to use 0=Input buffer, 1=Output buffer. ; Output - Carry Set - Byte from buffer is in AL ; Carry Reset - No data in buffer ; Changes - AL ;---------------------------------------------------------------------- GET_BUFF_DATA PROC NEAR ASSUME CS:CSEG,DS:CSEG,ES:NOTHING,SS:NOTHING PUSH BX ;Save registers PUSH SI CMP AH,0 ;Check which buffer to use JNZ GD_10 ;Jump for output buffer MOV SI,OFFSET IN_BUFF_HEAD ;Point to input buffer JMP GD_20 ;Skip over out buffer GD_10: MOV SI,OFFSET OUT_BUFF_HEAD ;Point to output buffer GD_20: CLI ;Don't allow interrupts MOV BX,[SI] ;Get the buffer head pointer CMP BX,2[SI] ;Test for data in buffer JE GD_EXIT ;If the same, no data so ; exit, carry is already reset MOV AL,[BX] ;Get the data INC BX ;Point to data in buffer CMP 6[SI],BX ;Beyond end of buffer area? JNE GD_30 ;No, then don't reset MOV BX,4[SI] ;Yes, reset to buffer begin GD_30: MOV [SI],BX ;Save new head pointer STC ;Indicate data is in AL GD_EXIT: POP SI ;Restore registers POP BX STI ;Enable interrupts RET GET_BUFF_DATA ENDP ;---------------------------------------------------------------------- ; Put a byte of data into a buffer. Byte is stored at location ; pointed to by tail pointer. ; Input - AL contains data to be put into buffer. ; AH - Buffer to use 0=Input buffer, 1=Output buffer ; Output - Carry Set - byte placed in buffer successfully ; Carry Reset - Buffer full, byte not stored in buffer ; Changes - Nothing ;---------------------------------------------------------------------- PUT_BUFF_DATA PROC NEAR ASSUME CS:CSEG,DS:CSEG,ES:NOTHING,SS:NOTHING PUSH AX ;Save registers PUSH BX PUSH DX PUSH SI PUSH DI PUSH DS PUSH CS ;Set data segment to CS POP DS CMP AH,0 ;Check which buffer to use JNZ PD_10 ;Jump for output buffer MOV SI,OFFSET IN_BUFF_HEAD ;Point to input buffer JMP PD_20 ;Skip over out buffer PD_10: MOV SI,OFFSET OUT_BUFF_HEAD ;Point to output buffer PD_20: CLI ;Don't allow interrupts MOV BX,2[SI] ;Get the buffer tail pointer MOV DI,BX ;Save the tail pointer INC BX ;Point to next data storage CMP 6[SI],BX ;Beyond end of buffer area? JNE PD_30 ;No, then don't reset MOV BX,4[SI] ;Yes, reset to buffer begin PD_30: CMP BX,[SI] ;Test for buffer full JE PD_40 ;If so, exit carry is reset MOV [DI],AL ;Store the data in buffer MOV 2[SI],BX ;Save new tail pointer STC ;Indicate data stored ok PD_40: PUSHF ;Save the flags CMP BYTE PTR COMM_INT_STA,0 ;Transmit int. running? JNZ PD_50 ;Yes, so exit MOV AX,OUT_BUFF_HEAD ;Is data in output buffer CMP AX,OUT_BUFF_TAIL JZ PD_50 ;No, so exit MOV BYTE PTR COMM_INT_STA,1 ;Set transmitting data flag MOV AH,1 ;Use the output buffer CALL GET_BUFF_DATA ;Get data from output buffer MOV DX,COMM_PORT ;Get port base address OUT DX,AL ;Send the data out the port PD_50: STI ;Enable interrupts POPF ;Restore flags POP DS ;Restore registers POP DI POP SI POP DX POP BX POP AX RET PUT_BUFF_DATA ENDP ;---------------------------------------------------------------------- ; Clear the input buffer ; Input - Nothing ; Output - Nothing ; Changes - Nothing ;---------------------------------------------------------------------- CLEAR_INBUFF PROC NEAR ASSUME CS:CSEG,DS:CSEG,ES:NOTHING,SS:NOTHING PUSH AX ;Save register CLI ;Disable interrupts MOV AX,IN_BUFF_TAIL ;Get buffer tail pointer MOV IN_BUFF_HEAD,AX ;Make head equal tail STI ;Enable interrupts POP AX RET CLEAR_INBUFF ENDP ;---------------------------------------------------------------------- ; Clear the output buffer ; Input - Nothing ; Output - Nothing ; Changes - Nothing ;---------------------------------------------------------------------- CLEAR_OUTBUFF PROC NEAR ASSUME CS:CSEG,DS:CSEG,ES:NOTHING,SS:NOTHING PUSH AX ;Save register CLI ;Disable interrupts MOV AX,OUT_BUFF_TAIL ;Get buffer tail pointer MOV OUT_BUFF_HEAD,AX ;Make head equal tail STI ;Enable interrupts POP AX RET CLEAR_OUTBUFF ENDP ;---------------------------------------------------------------------- ; Reset the modem and send the setup string to initialize ; Input - AL - 0 use setup string 1, 1 use setup string 2 ; Output - Nothing ; Changes - Nothing ;---------------------------------------------------------------------- RESET_MODEM PROC NEAR ASSUME CS:CSEG,DS:CSEG,ES:NOTHING,SS:NOTHING PUSH SI ;Save registers PUSH DX PUSH AX CMP BYTE PTR CONNECT_FLAG,0 ;Is modem connected? JZ RM_20 ;No then send setup only CALL CLEAR_OUTBUFF ;Empty the output buffer MOV BYTE PTR CONNECT_FLAG,0 ;Reset connect flag MOV AL,1 ;Wait a second for guard time CALL DELAY MOV SI,OFFSET MODEM_ESCAPE ;Send modem escape code CALL LOAD_ZSTRING MOV AL,2 ;Wait CALL DELAY MOV SI,OFFSET MODEM_HANGUP ;Send modem hangup code CALL LOAD_ZSTRING MOV AL,1 ;Wait for a second CALL DELAY RM_20: MOV AL,SPEED_FLAG ;Get speed flag CALL SET_BAUD_RATE MOV SI,OFFSET MODEM_ATTENTION ;Point to modem attention CALL LOAD_ZSTRING ;Put it into output buffer MOV AL,1 ;Wait for a second CALL DELAY POP AX ;Get setup string to use CMP AL,0 ;Test for string 1 JNZ RM_30 ;No, then use string 2 MOV SI,OFFSET MODEM_SETUP1 ;Point to modem setup string 1 JMP RM_40 RM_30: MOV SI,OFFSET MODEM_SETUP2 ;Point to modem setup string 2 RM_40: CALL LOAD_ZSTRING ;Load setup string to modem MOV AL,1 ;Wait a second CALL DELAY MOV SI,OFFSET MODEM_SETUP3 ;Point to modem setup string 3 CALL LOAD_ZSTRING ;Load setup string to modem CALL CLEAR_INBUFF ;Clear the input buffer POP DX ;Restore registers POP SI RET RESET_MODEM ENDP ;---------------------------------------------------------------------- ; Check carrier reads the carrier status signal and sets Z flag to ; indicate status ; Input - Nothing ; Output - Zero flag 0 - Carrier ; Zero flag 1 - No Carrier detected ; Changes - Nothing ;---------------------------------------------------------------------- CHECK_CARRIER PROC NEAR ASSUME CS:CSEG,DS:CSEG,ES:NOTHING,SS:NOTHING PUSH AX ;Save registers PUSH DX MOV DX,COMM_PORT ;Get the comm base address ADD DX,6 ;Modem status register IN AL,DX ;Get the current status TEST AL,10000000B ;Data carrier detect POP DX ;Restore registers POP AX RET CHECK_CARRIER ENDP ;---------------------------------------------------------------------- ; DELAY - delay approximate number of seconds in AL ; Input - AL ; Output - Nothing (just waits till AL is zero) ; Changes - Nothing ;---------------------------------------------------------------------- DELAY PROC NEAR PUSH CX ;Save registers PUSH DX PUSH DI PUSH AX XOR AH,AH ;Read system time INT 1AH MOV DI,DX ;Save low tick count MOV SI,CX ;Save high tick count POP AX ;Get number of seconds to delay PUSH AX XOR CX,CX ;Zero CX MOV CL,AL ;Put seconds into loop counter D_10: ADD DI,19D ;Approximate counts in a second ADC SI,0 ;Add carry to SI LOOP D_10 D_20: XOR AH,AH ;Read system time INT 1AH CMP SI,CX JNE D_20 CMP DI,DX ;End of delay time JGE D_20 ;No, keep checking POP AX ;Restore registers POP DI POP DX POP CX RET DELAY ENDP ;---------------------------------------------------------------------- ; String at SI is placed in output buffer to be sent out serial port ; Input - SI points to zero terminated string ; Output - Nothing ; Changes - SI ;---------------------------------------------------------------------- LOAD_ZSTRING PROC NEAR PUSH AX ;Save register MOV AH,1 ;Use output buffer CLD ;Forward LZ_10: LODSB ;Get a byte of data CMP AL,0 ;Check for zero JZ LZ_EXIT ;Yes, then exit CALL PUT_BUFF_DATA ;No, put in output buffer JMP LZ_10 ;Process next data LZ_EXIT: POP AX ;Restore register RET LOAD_ZSTRING ENDP ;---------------------------------------------------------------------- ; Check for a key in the keyboard buffer, if one is there, get it ; Input - Nothing ; Output - Zero flag = 1 no key in buffer ; Zero flag = 0 key is in AX ; Changes - AX ;---------------------------------------------------------------------- GET_KEYSTROKE PROC NEAR ASSUME CS:CSEG,DS:NOTHING,ES:NOTHING,SS:NOTHING MOV AH,1 ;Check for keystroke INT 16H ;Keyboard BIOS JZ GK_EXIT ;No key so exit PUSHF ;Save the zero flag XOR AH,AH ;Get the keystroke INT 16H POPF ;Restore the zero flag GK_EXIT: RET GET_KEYSTROKE ENDP ;---------------------------------------------------------------------- ; Change the interrupt 8 vector to the interrupt service routine of ; PCREMOTE ; Input - CX points to starting buffer location ; Output - Input and output buffer points are initialized ; Changes - BX, CX ;---------------------------------------------------------------------- INIT_BUFFERS PROC NEAR ASSUME CS:CSEG,DS:CSEG,ES:NOTHING,SS:NOTHING MOV BX,OFFSET IN_BUFF_HEAD ;In buffer will be here MOV WORD PTR [BX],CX ; Set head pointer to buffer MOV WORD PTR 2[BX],CX ;Set tail pointer to buffer MOV WORD PTR 4[BX],CX ;Set begin of buffer ADD CX,IN_BUFF_SIZE ;CX Points to end of in buffer MOV WORD PTR 6[BX],CX ;Set end of buffer MOV BX,OFFSET OUT_BUFF_HEAD ;Out buffer after in buffer MOV WORD PTR [BX],CX ; Set head pointer to buffer MOV WORD PTR 2[BX],CX ;Set tail pointer to buffer MOV WORD PTR 4[BX],CX ;Set begin of buffer ADD CX,OUT_BUFF_SIZE ;CX Points to end of out buffer MOV WORD PTR 6[BX],CX ;Set end of buffer RET INIT_BUFFERS ENDP ;---------------------------------------------------------------------- ; Change the interrupt 8 vector to the interrupt service routine of ; PCREMOTE ; Input - Nothing ; Output - Interrupt vector 8 points to INT8 ; Changes - AX, DX, BX, ES ;---------------------------------------------------------------------- MODIFY_INT8 PROC NEAR ASSUME CS:CSEG,DS:CSEG,ES:NOTHING,SS:NOTHING ; ; Change interrupt 8 vector ; MOV AX,3508H ;Get interrupt 8h vector INT 21H MOV OLDINT_8,BX ;And save it MOV OLDINT_8[2],ES MOV AX,2508H ;Set interrupt 8h vector MOV DX,OFFSET INT8 ; to point to new routine INT 21H RET MODIFY_INT8 ENDP ;---------------------------------------------------------------------- ; Set baud rate to 1200 or 2400 ; Input - AL -0 1200 baud, 1 2400 baud ; Output - Nothing ; Changes - Nothing ;---------------------------------------------------------------------- SET_BAUD_RATE PROC NEAR ASSUME CS:CSEG,DS:CSEG,ES:NOTHING,SS:NOTHING PUSH DX ;Save registers PUSH BX PUSH SI PUSH AX MOV DX,COMM_PORT ;Get port address ADD DX,3 ;Line control register MOV AL,83H ;Toggle port address to OUT DX,AL ; prepare to set baud rate SUB DX,2 ;Baud rate divisor MSB port POP AX ;Restore baud rate PUSH AX XOR AH,AH ;Zero AH MOV SI,AX ;Save in index register SHL SI,1 ;Multiply by 2, word address MOV BX,OFFSET BAUD_RATE ;Point to baud rates MOV AL,[BX+SI] ;Get baud rate MSB OUT DX,AL ; and set it DEC DX ;Baud rate divisor LSB port MOV AL,1[BX+SI] ;Get baud rate LSB OUT DX,AL ; and set it ADD DX,3 ;Line control register MOV AL,3 ;8 data bits,1 stop,no parity OUT DX,AL ;Set data bit pattern ; and toggle port address POP AX ;Restore registers POP SI POP BX POP DX RET SET_BAUD_RATE ENDP ;====================================================================== ; Initialize routines. The initialize routine for unattended is first ; because it must remain resident. ;====================================================================== ;----------------------------------------------------------------------------- ; Initialize the unattended program. ;----------------------------------------------------------------------------- INIT_UNATTENDED PROC NEAR ASSUME CS:CSEG,DS:CSEG,ES:CSEG,SS:NOTHING CALL IU_10 ;Init pointers,clear video copy CALL MODIFY_INT8 ;Change INT 8 vector ; ; Terminate-Stay-Resident ; MOV DX,VIDEO_COPY ;Start of video copy ADD DX,4000D ;Allow room for video copy INT 27H ;Terminate-Stay-Resident ; ; Initialize buffer pointers and video copy pointer ; IU_10: PUSH ES ;Save extra segment MOV CX,OFFSET INITIALIZE ;CX points to begin of buffer ADD CX,256D ;Leave room for TSR stack CALL INIT_BUFFERS ;Initalize the buffer pointers INC CX ;Point to copy of video ram MOV TEMP_VIDEO_PTR,CX ;Save address of temp video buf ADD CX,BLOCK_SIZEX2 ;Save room for temp video data MOV VIDEO_COPY,CX ;Save address of video copy ; ; fill video RAM image with with space code since screen ; of manned system is blanked when connected ; PUSH CS ;Video copy is destination POP ES ;ES:DI points to video copy MOV DI,WORD PTR VIDEO_COPY MOV AX,0720H ;Data to fill buffer CLD ;Move upward MOV CX,2000D ;Move 2000 words REP STOSW ;Fill to force screen dump MOV CURSOR_POSITION,0FFFFH ;Force cursor position update MOV AL,1 ;Use setup string 2 CALL RESET_MODEM ;Reset the modem POP ES ;Restore extra segment RET INIT_UNATTENDED ENDP ;----------------------------------------------------------------------------- ; INITIALIZE - Initialize the program. Determine whether it is manned ; or unattended by processing the command line. Initialize the serial ; port. ;----------------------------------------------------------------------------- INITIALIZE PROC NEAR ASSUME CS:CSEG,DS:CSEG,ES:NOTHING,SS:NOTHING ; ; Display copyright notice. ; MOV DX,OFFSET COPYRIGHT ;Display copyright notice MOV AH,9 ;Display string INT 21H ; ; check to see if the program is already in memory ; MOV BYTE PTR START,0 ;Zero word to avoid false match XOR BX,BX ;Initialize search segment MOV AX,CS ;Save current segment in AX CLD ;Clear direction flag I_10: INC BX ;Increment search segment CMP AX,BX ;Reached current segment? JE I_20 ;Yes, PCREMOTE not resident MOV ES,BX ;Point ES to search segment MOV SI,OFFSET START ;Start of compare area MOV DI,SI ;Make offsets equal MOV CX,16D ;Check 16 characters REPE CMPSB ;Compare the strings JNE I_10 ;Compare failed MOV AH,09H ;Print string MOV DX,OFFSET PROG_RES ;Display program resident mess. INT 21H INT 20H ;Terminate ; ; Process command line for switches. ; I_20: PUSH CS ;Restore ES POP ES MOV BX,80H ;Point to command line length MOV AH,[BX] ;Get command line length I_30: OR AH,AH ;Check for commands JZ I_70 ;None, so don't look INC BX ;Point to next data MOV AL,[BX] ;Get data DEC AH ;Decrement counter CMP AL,"/" ;Check for slash JNE I_30 ;No, jump to check next data OR AH,AH ;Check for data after slash JZ I_70 ;No, so don't process INC BX ;Point to next data MOV AL,[BX] ;Get data DEC AH ;Decrement counter CMP AL,"2" ;Check for COM2 JNE I_40 ;No, check for another switch INC BYTE PTR COMM_FLAG ;Set COM2 flag JMP I_30 ;Process next switch I_40: OR AL,20H ;Force data to lower case CMP AL,"m" ;Check for manned switch JNE I_50 ;No, check for another switch INC BYTE PTR MANNED_FLAG ;Set manned flag JMP I_30 ;Process next switch I_50: CMP AL,"f" ;Check for fast speed JNE I_60 ;No, check for another switch INC BYTE PTR SPEED_FLAG ;Set high speed flag JMP I_30 ;Process next switch I_60: CMP AL,"d" ;Check for desnow JNE I_30 ;No, process next switch INC BYTE PTR DESNOW_FLAG ;Set desnow flag JMP I_30 ;Process next switch ;---------------------------------------------------------------------- ; Initialize the serial port ;---------------------------------------------------------------------- I_70: ; ; get the comm port base address using 2* comm port flag as offset ; PUSH DS ;Save data segment XOR BX,BX ;Zero BX MOV BL,COMM_FLAG ;Get comm port flag MOV SI,BX ;Save in index register SHL SI,1 ;Multiply by 2, word address MOV AX,40H ;Point DS to BIOS data area MOV DS,AX XOR BX,BX ;Point to comm port address MOV AX,[BX+SI] ;Get comm port address POP DS ;Restore data segment MOV COMM_PORT,AX ;Save comm port address ; ; disable the interrupts on the 8250 and initialize DTR and RTS ; CLI ;Disable interrupts MOV DX,COMM_PORT ;Get UART base address ADD DX,4 ;Modem control register MOV AL,00001011B ;Set DTR, RTS, and OUT2 OUT DX,AL ; ; set the baud rate of the UART and initialize line control register ; MOV AL,SPEED_FLAG ;Get speed flag CALL SET_BAUD_RATE ; ; modify the interrupt vector for the comm port and set 8259 mask ; CMP BYTE PTR COMM_FLAG,0 ;Determine INT vector to change JZ I_80 MOV AL,11D ;Vector for COM2 MOV BL,0F7H ;Mask for 8259 COM2 JMP I_90 I_80: MOV AL,12D ;Vector for COM1 MOV BL,0EFH ;Mask for 8259 COM1 I_90: MOV AH,25H ;Set interrupt for comm vector MOV DX,OFFSET INT_COMM ; to point to routine INT 21H IN AL,21H ;Get current 8259 int mask AND AL,BL ;Mask appropriate int bit OUT 21H,AL ;And set new 8259 mask ; ; enable the data received interrupt and reset the 8250 ; MOV DX,COMM_PORT ;Point to comm port INC DX ;Point to int enable reg MOV AL,3 ;Enable data received int OUT DX,AL DEC DX ;Point to base address MOV CX,7 ;Reset the serial port I_100: IN AL,DX ;Read registers to reset INC DX LOOP I_100 ; ; determine color or monochrome and save appropriate video segment ; MOV AH,0FH ;Determine video mode INT 10H ;By using BIOS int 10 CMP AL,7 ;Check for monochrome JZ MONOCHROME ;Jump if it is MOV WORD PTR VIDEO_SEGMENT,0B800H ;Nope, it's CGA or EGA JMP I_110 ;Skip over MONOCHROME: MOV WORD PTR VIDEO_SEGMENT,0B000H ;It's a monochrome I_110: ; ; If manned then execute manned initialization, otherwise execute ; unattended initialization. ; CMP BYTE PTR MANNED_FLAG,0 ;Manned or unattended JNZ INIT_MANNED ;Init the manned routines JMP INIT_UNATTENDED ;Init the unattended routines INITIALIZE ENDP ;---------------------------------------------------------------------- ; Initialize the manned program. Initialize buffers, and change INT 8 ; vector. ;---------------------------------------------------------------------- INIT_MANNED PROC NEAR ASSUME CS:CSEG,DS:CSEG,ES:NOTHING,SS:NOTHING MOV CX,OFFSET LAST_BYTE ;CX points to begin of buffer CALL INIT_BUFFERS ;Initalize the buffer pointers MOV AX,VIDEO_SEGMENT ;Set ES to point to video RAM MOV ES,AX JMP CONNECT_MANNED ;Run manned portion of program INIT_MANNED ENDP ;====================================================================== ; Data used by manned portion of program only. Not required to be ; resident for unattended mode. ;====================================================================== BLOCK_DATA_COUNT DB 0 ;Number of bytes left to rec. TYPE_TRANSFER DB 0FFH ;FF - No data transfer in prog. ;00 - Received FE, char. data ;01 - Received FF, attr. data CUR_STATUS DB 0 ;0=No cursor data being rec. ; otherwise, byte count CUR_LOW DB 0 ;Low byte of cursor data CUR_HIGH DB 0 ;High byte of cursor data ENTER_NUMBER DB CR,LF,CR,LF,"Enter phone number:$" NO_CARRIER DB CR,LF,"No carrier.$" MODEM_ERROR DB CR,LF,"Error.$" TERMINATE_MESS DB CR,LF,"Returning to DOS.$" PROG_RES DB CR,LF,"PCREMOTE is already resident.$" EXIT_MESSAGE DB "╔══════════════════╗" DB "║ OK to EXIT? (Y/N)║" DB "╚══════════════════╝" ;====================================================================== ; The manned routine will execute the connect manned routine to call the ; unattended system. These routines are only used in the manned mode. ;====================================================================== ;---------------------------------------------------------------------- ; Connect manned asks for the phone number to call, dials the number ; and waits for connect. Once connected it sends bursts of 20 CRs at ; one second intervals. When it receives alpha data it processes video ; data and waits for sync byte (00), then transfers control to the ; manned routine. ;---------------------------------------------------------------------- CONNECT_MANNED PROC NEAR ASSUME CS:CSEG,DS:CSEG,ES:NOTHING,SS:NOTHING XOR AL,AL ;Use setup string 1 CALL RESET_MODEM ;Reset the modem first MOV DX,OFFSET ENTER_NUMBER ;Point to enter number mess. MOV AH,9 ;Display message INT 21H MOV DX,OFFSET UNATTENDED ;Unused area as keyboard buffer MOV BX,DX ;Enter max characters for input MOV BYTE PTR [BX],40D MOV AH,0AH ;Buffered keyboard input INT 21H ;Get the phone number MOV AL,1 ;Wait a second CALL DELAY MOV SI,OFFSET UNATTENDED ;Point to phone number INC SI ;Amount of data in key buffer XOR AX,AX ;Zero AX CLD ;Forward LODSB ;Get count OR AL,AL ;Check for no input JNZ CM_10 ;If there is then continue JMP EXIT_MANNED ;No, then exit program CM_10: PUSH SI ;Save pointer MOV SI,OFFSET TONE_DIAL ;Send the tone dial command CALL LOAD_ZSTRING POP SI ;Restore pointer ADD SI,AX ;Point to end of buffer INC SI ;Include CR code MOV BYTE PTR [SI],0 ;And put a zero on end DEC SI ;Adjust for previous INC SUB SI,AX ;Back to begin of buffer CALL LOAD_ZSTRING ;Dial the phone number MOV AL,1 ;Wait a second CALL DELAY CALL CLEAR_INBUFF ;Clear input buffer CM_20: CALL CHECK_CARRIER ;Check for a connect signal JZ CM_30 ;No, then check for err codes CALL CLEAR_SCREEN ;Yes, blank the screen MOV BYTE PTR CONNECT_FLAG,1 ;Set the connect flag JMP CM_60 ;Execute manned CM_30: MOV AH,0 ;Use input buffer CALL GET_BUFF_DATA ;Get data from buffer JNC CM_20 ;No data, try again CMP AL,"3" ;No carrier code? JNZ CM_50 ;No, check for other code CM_40: MOV DX,OFFSET NO_CARRIER ;Send no carrier message MOV AH,09H INT 21H JMP CONNECT_MANNED ;Yes, reset modem and try again CM_50: CMP AL,"8" ;2400 no answer code JZ CM_40 ;Yes, display no carrier mess CMP AL,"4" ;Error code? JNZ CM_20 ;No, check for other code MOV DX,OFFSET MODEM_ERROR ;Send modem command error mess MOV AH,09H INT 21H JMP CONNECT_MANNED ;Yes, reset modem and try again CM_60: MOV AL,1 ;Wait for a second CALL DELAY MOV BYTE PTR CR_COUNT,20D ;Send 20 CRs at a time CM_70: CALL CHECK_CARRIER ;Check for carrier loss JNZ CM_80 ;No, then continue JMP EXIT_MANNED ;Yes, then exit CM_80: MOV AX,OUT_BUFF_TAIL ;Is output buffer empty? CMP AX,OUT_BUFF_HEAD JNZ CM_90 ;No, skip CR MOV AL,CR ;Send a CR for speed sync MOV AH,1 ;Use output buffer CALL PUT_BUFF_DATA DEC BYTE PTR CR_COUNT ;Decrement CR counter JZ CM_60 CM_90: MOV AH,0 ;Use input buffer CALL GET_BUFF_DATA ; and check for data JNC CM_70 ;No data so keep checking CMP AL,'@' ;Alpha message? JL CM_70 ;No, then wait for it CM_100: CMP AL,0 ;Is data a sync byte JNE CM_110 ;No, then put data on screen CALL CLEAR_SCREEN ;Blank the screen JMP MANNED ;We're in, let's run program CM_110: MOV DL,AL ;Prepare to display character MOV AH,2 ; using DOS INT 21H ;Display it CM_120: CALL CHECK_CARRIER ;Check for carrier loss JNZ CM_130 ;No, then continue JMP EXIT_MANNED ;Yes, then exit CM_130: CALL GET_KEYSTROKE ;Check for a keystroke JZ CM_150 ;If none, skip next routine ; ; Check for exit code, if it is then exit ; CMP AX,WORD PTR EXIT_CODE ;Check for exit code JNZ CM_140 ;No, so continue CALL CONFIRM_EXIT ;Yes, confirm exit JNZ CM_150 ;No, so continue, don't send JMP EXIT_MANNED ;Otherwise reset and exit CM_140: CALL SEND_KEYSTROKE ;Send to unattended system CM_150: MOV AH,0 ;Use input buffer CALL GET_BUFF_DATA ; and check for data JNC CM_120 ;No data, check for keys JMP CM_100 ;Check for sync byte CONNECT_MANNED ENDP ;---------------------------------------------------------------------- ; Manned portion of the program. Not RAM resident. Sends keystrokes ; to the unattended computer. Data from unattended computer is ; decoded and processed. ;---------------------------------------------------------------------- MANNED PROC NEAR ASSUME CS:CSEG,DS:CSEG,ES:NOTHING,SS:NOTHING ; ; Check for loss of carrier ; CALL CHECK_CARRIER ;No, check for carrier loss JNZ M_10 ;No loss so continue JMP EXIT_MANNED ;Otherwise reset and exit ; ; Check to see if shift status has changed, if so, put new status ; in the output buffer ; M_10: MOV AH,2 ;Prepare to get shift status INT 16H ;Get shift status CMP SHIFT_STATUS,AL ;See if the same JE M_20 ;If so then next routine MOV SHIFT_STATUS,AL ;Save new status MOV AL,0FDH ;Sync byte, to expect shift MOV AH,1 ;Put into output buffer CALL PUT_BUFF_DATA MOV AL,SHIFT_STATUS ;Get the shift status CALL PUT_BUFF_DATA ;Send to unattended computer ; ; Check for keystoke, if so, put the ASCII code and scan code ; into the output buffer, check it for exit code ; M_20: CALL GET_KEYSTROKE ;Check for keystroke JZ M_50 ;If none skip this routine ; ; Check for exit code, if it is then exit ; CMP AX,WORD PTR EXIT_CODE ;Check for exit code JNZ M_40 ;No, so continue CALL CONFIRM_EXIT ;Yes, confirm exit JNZ M_50 ;No, so continue, don't send JMP EXIT_MANNED ;Otherwise reset and exit M_40: CALL SEND_KEYSTROKE ;Send keystroke ; ; Check for receive data, if available, get data and decode ; M_50: MOV AH,0 ;Get data from input buffer CALL GET_BUFF_DATA JC M_60 ;Data is there, so process JMP M_EXIT ;No data,so loop again M_60: CMP BYTE PTR TYPE_TRANSFER,0FFH ;Check transfer type JZ M_100 ;If ff, check for sync byte M_70: CMP VID_RAM_OFFSET,0FFFFH ;Received block no. yet? JNZ M_80 ;Yes, then process as data MOV BYTE PTR BLOCK_DATA_COUNT,BLOCK_SIZE ;Data counter MOV BX,BLOCK_SIZEX2 ;Get block size in bytes MUL BX ;Block number X block size ADD AL,TYPE_TRANSFER ;Adjust for char. or attr. MOV VID_RAM_OFFSET,AX ;Save pointer to video RAM JMP M_EXIT M_80: MOV DI,VID_RAM_OFFSET ;Point to video RAM CALL PUT_VIDEO_DATA ;Store the data in video RAM INC DI ;Point to next video RAM loc. MOV VID_RAM_OFFSET,DI ;And save pointer DEC BYTE PTR BLOCK_DATA_COUNT ;Dec. data counter JZ M_90 ;End of data, reset variables JMP M_EXIT ;Otherwise continue M_90: MOV BYTE PTR TYPE_TRANSFER,0FFH ;Reset type transfer flag JMP M_EXIT M_100: CMP BYTE PTR CUR_STATUS,0 ;Check cursor status JZ M_110 ;If 0, check for sync byte XOR BX,BX ;Zero BX for index MOV BL,BYTE PTR CUR_STATUS ;Use as index for cursor data MOV DI,OFFSET CUR_STATUS ;Base address for cursor data MOV [DI+BX],AL ;Save the register data INC BL ;Increment count MOV BYTE PTR CUR_STATUS,BL ;And save it CMP BL,3 ;Check to see if we have 3 byte JNZ M_EXIT ;No, so wait till enough data MOV BH,0 ;Always use page one MOV DX,WORD PTR CUR_LOW ;Get cursor position MOV AH,2 ;Set cursor function INT 10H MOV BYTE PTR CUR_STATUS,0 ;Reset cursor status JMP M_EXIT M_110: PUSH AX ;Save the data AND AL,0FEH ;Mask out LSB CMP AL,0FEH ;Video data sync? JNZ M_120 ;No, check for cursor sync POP AX ;Yes, restore data AND AL,1 ;Save LSB MOV TYPE_TRANSFER,AL ;Set transfer type flag MOV VID_RAM_OFFSET,0FFFFH ;Prepare to receive block no. JMP M_EXIT M_120: CMP AL,0D2H ;Check for cursor data sync JNZ M_130 ;If not, then throw away POP AX ;Restore data MOV BYTE PTR CUR_STATUS,1 ;Set cursor status byte JMP M_EXIT M_130: POP AX ;Clean up stack M_EXIT: JMP MANNED ;Do it again MANNED ENDP ;---------------------------------------------------------------------- ; Exit manned. The exit code is sent, interrupt vector reset, and ; the modem is hung up and reset ; Input - Nothing ; Output - DOS ; Changes - everything ;---------------------------------------------------------------------- EXIT_MANNED PROC NEAR ASSUME CS:CSEG,DS:CSEG,ES:NOTHING,SS:NOTHING MOV AX,WORD PTR EXIT_CODE ;Get the exit code CALL SEND_KEYSTROKE ;Send the exit code CALL CLEAR_SCREEN ;Blank the screen MOV DX,OFFSET TERMINATE_MESS;Display terminate call msg MOV AH,09H INT 21H XOR AL,AL ;Reset modem and exit CALL RESET_MODEM MOV AL,1 ;Wait a second CALL DELAY ; ; Disable the serial port interrupts and reset the 8259 mask ; MOV DX,COMM_PORT ;Get port address INC DX ;Interrupt enable reg. XOR AL,AL OUT DX,AL ;Disable all interrupts CMP BYTE PTR COMM_FLAG,0 ;Determine mask bit to change JZ EM_10 MOV BL,00001000B ;Mask for 8259 COM2 JMP EM_20 EM_10: MOV BL,00010000B ;Mask for 8259 COM1 EM_20: IN AL,21H ;Get current 8259 int mask OR AL,BL ;Set appropriate int bit OUT 21H,AL ;And set new 8259 mask INT 20H ;Terminate program EXIT_MANNED ENDP ;---------------------------------------------------------------------- ; Clear screen. This routine will blank the video display ; Input - Nothing ; Output - Screen is cleared ; Changes - AX, BX, CX, DX ;---------------------------------------------------------------------- CLEAR_SCREEN PROC NEAR ASSUME CS:CSEG,DS:CSEG,ES:NOTHING,SS:NOTHING MOV BX,0 ;Use video page one MOV DX,0 ;Position cursor at row 0 col 0 MOV AH,2 ;Set cursor function INT 10H MOV AX,0700H ;Scroll down, clear screen MOV BH,07H ;White on black MOV CX,0 ;Upper left corner MOV DH,24D ;Lower right corner MOV DL,79D INT 10H ;Video BIOS call RET CLEAR_SCREEN ENDP ;---------------------------------------------------------------------- ; Store the video data in AL in the memory location pointed to by DI ; Input - AL video data, ES:DI video RAM destination ; Output - Nothing ; Changes - DI is incremented ;---------------------------------------------------------------------- PUT_VIDEO_DATA PROC NEAR ASSUME CS:CSEG,DS:CSEG,ES:NOTHING,SS:NOTHING ; ; Check desnow flag, if set wait for horizontal sync to put in video RAM ; PUSH BX ;Save registers PUSH DX CMP BYTE PTR DESNOW_FLAG,0 ;Check desnow flag JZ PV_30 ;No, skip over CLD ;Forward MOV BL,AL ;Save video data MOV DX,3DAH ;CGA status port CLI ;Disable interrupts PV_10: IN AL,DX ;Get status byte TEST AL,1 ;Test display enable JNZ PV_10 ;If in Hor. sync then wait PV_20: IN AL,DX ;Get status byte TEST AL,1 ;Test display enable JZ PV_20 ;Wait for Hor. sync XCHG AX,BX ;Get video data PV_30: STOSB ;And put into video RAM STI ;Enable interrupts POP DX ;Restore registers POP BX RET PUT_VIDEO_DATA ENDP ;---------------------------------------------------------------------- ; Display OK to exit message and wait for response ; Input - Nothing ; Output - Zero flag set - exit, zero flag reset - do not exit ; Changes - CX, SI, DI ;---------------------------------------------------------------------- CONFIRM_EXIT PROC NEAR ASSUME CS:CSEG,DS:CSEG,ES:NOTHING,SS:NOTHING PUSH AX ;Save the exit code CE_10: MOV AX,OUT_BUFF_HEAD ;Wait until the out buffer CMP AX,OUT_BUFF_TAIL ; is empty JNZ CE_10 ; ; Save the existing video data in the output buffer ; CALL SWITCH_DS_ES MOV DI,ES:OUT_BUFF_BEGIN ;Use output buffer as temp stor. MOV SI,0 ;Upper left corner of video MOV CX,3 ;Transfer 3 lines CE_20: PUSH CX ;Save line counter MOV CX,20D ;Transfer 20 char. per line REPNZ MOVSW ADD SI,120D ;Next line POP CX ;Restore line counter LOOP CE_20 ; ; Display the ok to exit message ; CALL SWITCH_DS_ES MOV DI,0 ;Upper left corner of video MOV SI,OFFSET EXIT_MESSAGE ;Exit message MOV CX,3 ;Display three lines CE_30: PUSH CX ;Save line counter MOV CX,20D ;Display 20 characters per line CE_40: LODSB CALL PUT_VIDEO_DATA ;Display the character MOV AL,7 ;White on black attribute CALL PUT_VIDEO_DATA ;Store attribute LOOP CE_40 ADD DI,120D ;Next line POP CX ;Restore line counter LOOP CE_30 ; ; Wait for keystroke and convert to lower case ; CE_50: CALL GET_KEYSTROKE ;Check for keystroke JZ CE_50 ;None there, try again OR AL,20H ;Convert to lower case ; ; Restore the saved video data ; MOV SI,OUT_BUFF_BEGIN ;Old video is in output buffer MOV DI,0 ;Upper left corner of video MOV CX,3 ;Transfer 3 lines CE_60: PUSH CX ;Save line counter MOV CX,20D ;Transfer 20 char. per line REPNZ MOVSW ADD DI,120D ;Next line POP CX ;Restore line counter LOOP CE_60 CMP AL,'y' ;Check for yes, all others no POP AX ;Restore exit code RET CONFIRM_EXIT ENDP ;---------------------------------------------------------------------- ; Switch ES and DS ; Input - Nothing ; Output - ES is in DS and DS is in ES ; Changes - ES, DS ;---------------------------------------------------------------------- SWITCH_DS_ES PROC NEAR PUSH ES PUSH DS POP ES POP DS RET SWITCH_DS_ES ENDP ;---------------------------------------------------------------------- ; Put the keystroke data into the output buffer to be sent to unattended ; system ; Input - AX - keystroke data ; Output - Nothing ; Changes - Nothing ;---------------------------------------------------------------------- SEND_KEYSTROKE PROC NEAR ASSUME CS:CSEG,DS:CSEG,ES:NOTHING,SS:NOTHING PUSH AX ;Save it MOV AH,1 ;Use the output buffer MOV AL,0FEH ;Sync byte, to expect key data CALL PUT_BUFF_DATA ;Put AL into the output buffer POP AX ;Get AL back PUSH AX ;Save AH MOV AH,1 ;Use the output buffer CALL PUT_BUFF_DATA ;Put ASCII code in out buffer POP AX ;Get AH back PUSH AX ;Save keystroke MOV AL,AH ;Move it to AL MOV AH,1 ;Use the output buffer CALL PUT_BUFF_DATA ;Put scan code in out buffer POP AX ;Restore keystroke RET SEND_KEYSTROKE ENDP ;====================================================================== LAST_BYTE EQU $ CSEG ENDS END START