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ZMO-MIC5.Z80
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2000-06-30
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; PROGRAM: ZMO-MIC5.Z80
; AUTHOR: Ian Justman
; VERSION: 1.5
; DATE: 14 Sept, 1988
;-----------------------------------------------------------------------
; This overlay is set up for a Multitech MIC-500 computer
; Uses a Z80 DART and Z80 CTC baudrate generator
;-----------------------------------------------------------------------
; 89/04/12 - Modified to ZMP v1.5 - George Conover
; 89/03/15 - Removed the beginning remarks to make the file
; smaller. If you need the remarks there are in the
; file ZMP-BLNK.Z80 - George Conover
; 89/03/14 - Modified to ZMP v1.4 - George Conover
; 89/00914 - First version of this file - Ian Justman
;
; Written by -
; Ron Murray, c/o Z-Node 62, 061-9-450-0200, Perth, Western Australia.
;-----------------------------------------------------------------------
NO EQU 0
YES EQU NOT NO
;
;------------------------------------------------------------------------------
; User-set variables
;
CLKSPD EQU 4 ; Processor clock speed in MHz
;
;Set the following two equates to the drive and user area which will contain
; ZMP's .OVR files, .CFG file, .FON file and .HLP file. Set both to zero
; (null) to locate them on the drive from which ZMP was invoked.
OVERDRIVE EQU 'A' ; Drive to find overlay files on ('A'-'P')
OVERUSER EQU 0 ; User area to find files
;
DPORT EQU 88H ; DART data port
SPORT EQU DPORT+2 ; DART status port
;
;The following are used in setting up the Z80 DART.
;
RSTINS EQU 18H ; Reset DART - register 0
;
RSTERR EQU 30H ; Reset parity and overrun flags - register 0
REG1INS EQU 0 ; No interrupts - register 1
REG3INS EQU 0C1H ; 8 Rx bits, Rx enable
REG4INS EQU 44H ; 16X baud rate, 1 stop bit, no parity
REG5INS EQU 0E8H ; 8 Tx bits, Tx enable, no RTS, DTR
;
; Baud rate
;
BAUDA EQU 85H ; Baud rate generator for serial chan a
;
; NOT user-set variables
;
USERDEF EQU 00145H ; Origin of this overlay: get this value
; ; From the .SYM file produced when
; ; ZMP.COM is linked
MSPEED EQU 003CH ; Current baud rate: as used by BYE etc
; ; ZMP.H
OVSIZE EQU 0400H ; Max size of this overlay
;
.Z80 ; Use Z80 code
ASEG ; Absolute
;
ORG USERDEF
;
ESC EQU 1BH
CTRLQ EQU 11H
CR EQU 0DH
LF EQU 0AH
BDOS EQU 5
;
; Jump table for the overlay: do NOT change this
;
CODEBGN EQU $
;
JUMPTAB:
JP SCRNPR ; Screen print
JP MRD ; Modem read with timeout
JP MCHIN ; Get a character from modem
JP MCHOUT ; Send a character to the modem
JP MORDY ; Test for tx buffer empty
JP MIRDY ; Test for character received
JP SNDBRK ; Send break
JP CURSADD ; Cursor addressing
JP CLS ; Clear screen
JP INVON ; Inverse video on
JP INVOFF ; Inverse video off
JP HIDE ; Hide cursor
JP SHOW ; Show cursor
JP SAVECU ; Save cursor position
JP RESCU ; Restore cursor position
JP MINT ; Service modem interrupt
JP INVEC ; Initialise interrupt vectors
JP DINVEC ; De-initialise interrupt vectors
JP MDMERR ; Test uart flags for error
JP DTRON ; Turn DTR on
JP DTROFF ; Turn DTR OFF
JP INIT ; Initialise uart
JP WAIT ; Wait seconds
JP MSWAIT ; Wait milliseconds
JP USERIN ; User-defined entry routine
JP USEROUT ; User-defined exit routine
JP GETVARS ; get system variables
JP SETPORT ; Set port (0 or 1)
;
; Spare jumps for compatibility with future versions
;
JP SPARE ; spare for later use
JP SPARE ; Spare for later use
JP SPARE ; Spare for later use
JP SPARE ; Spare for later use
JP SPARE ; Spare for later use
JP SPARE ; Spare for later use
;
; Screen print function
;
SCRNPR: DS 0
;
; <== Insert your own code here
;
CALL PRINT
DB 'This function not supported.',CR,LF,0
;
; <== End of your own code
;
SPARE: RET
;
; User-defined entry routine
;
USERIN: RET
;
; User-defined exit routine
;
USEROUT:RET
;
; Get a character from the modem: return in HL
; It is not necessary to test for status
;
MCHIN: PUSH BC
;
; <== Insert your own code here, to get the character in A
;
IN A,(DPORT) ; Get the character from the serial port
LD L,A ; Put in HL
LD A,(PARITY) ; Strip hi bit if parity odd or even
CP 'N' ; No parity?
JR Z,SKIPPAR ; Yes, skip
LD A,L
AND 07FH ; Strip parity bit
LD L,A ; Put the character in HL
;
SKIPPAR:LD A,L ; Put the character back in A
;
; <== End of your own code
;
LD H,0
OR A ; Set/clear Z
POP BC
RET
;
; Send a character to the modem
;
MCHOUT: LD HL,2 ; Get the character
ADD HL,SP
LD A,(HL) ; In A
;
; <== Insert your own code here
;
OUT (DPORT),A ; Put the character to the serial port
;
; <== End of your own code
;
RET ; Done
;
; Test for output ready: return YES (1) in HL if ok
;
MORDY: DS 0
;
; <== Insert your own code here
;
IN A,(SPORT) ; Read status port
LD HL,0 ; Assume not ready
AND 4 ; Look at bit 0
JR Z,MORDY1
INC HL ; Otherwise set it
;
MORDY1: DS 0
;
; <== End of your own code
;
LD A,L ; Set/clear Z
OR A
RET
;
; Test for character at modem: return YES (1) in HL if so
;
MIRDY: DS 0
;
; <== Insert your own code here
;
IN A,(SPORT) ; Read status of serial port
LD HL,0 ; Assume not ready
AND 1 ; Test bit 1
JR Z,MIRDY1
INC HL ; Otherwise set it
;
MIRDY1: DS 0
;
; <== End of your own code
;
LD A,L ; Set/clear Z
OR A
RET
;
; Send a break to the modem: leave empty if your system can't do it
;
SNDBRK: DS 0
;
; <== Insert your own code here, to go to 'break' level
;
; This routine sets a 300 ms break tone
;
LD A,5
OUT (SPORT),A ; Output to the status port
LD A,0F8H ; DTR normal, send break tone
OUT (SPORT),A ; Output to the status port
;
; <== End of your own code
;
LD HL,300
CALL WAITHLMS ; Wait 300 milliseconds
;
; <== Insert your own code here, to restore
;
LD A,5
OUT (SPORT),A ; Output to the status port
LD A,0E8H ; Restore normal, 8 bits, DTR on, etc.
OUT (SPORT),A ; Output to the status port
;
; <== End of your own code
;
RET
;
; Test UART flags for error: return YES (1) in HL if error
;
MDMERR: DS 0
;
; <== Insert your own code here
;
XOR A ; Currently not implemented
;
; <== End of your own code
;
LD A,L ; Set/clear Z
OR A
RET
;
; Turn DTR (and optionally RTS) ON.
;
DTRON: DS 0
;
; <== Insert your own code here
;
LD A,5 ; Select register 5
OUT (SPORT),A
LD A,REG5INS+2 ; 8 Tx bits, Tx enable, RTS, DTR
OUT (SPORT),A
;
; <== End of your own code
;
RET
;
; Turn DTR ( and RTS?) OFF
;
DTROFF: DS 0
;
; <== Insert your own code here
;
LD A,5 ; Select register 5
OUT (SPORT),A
LD A,REG5INS ; 8 Tx bits, Tx enable, no RTS, DTR
OUT (SPORT),A
;
; <== End of your own code
;
RET
;
; Initialise the UART
;
INIT: LD HL,2 ; Get parameters
ADD HL,SP
EX DE,HL
CALL GETPARM ; In HL
LD (BRATE),HL
CALL GETPARM
LD (PARITY),HL ; Parity
CALL GETPARM
LD (DATA),HL ; Data bits
CALL GETPARM
LD (STOP),HL ; Stop bits
;
; <== Insert your own code here
;
; Using values below
LD A,0 ; Select register 0
OUT (SPORT),A
LD A,RSTINS ; Reset DART - 18h
OUT (SPORT),A
LD A,4 ; Select register 4
OUT (SPORT),A
LD A,(PARITY) ; Do parity
LD E,003H ; Assume even
CP 'E' ; Even?
JR Z,SETSTOP ; Yes
LD E,001H ; Try odd
CP 'O'
JR Z,SETSTOP
LD E,0 ; Indicate no parity
;
SETSTOP:LD A,(STOP) ; Set stop bits
CP 2
LD A,REG4INS ; 16X baud rate, 1 stop bit, no parity
JR NZ,ONESTOP
OR 00CH ; Set bits 2 and 3
;
ONESTOP:OR E ; Put parity bits in the register
OUT (SPORT),A
LD A,3 ; Select register 3
OUT (SPORT),A
LD A,(DATA) ; Get data bits parameter field
CP 7 ; Is 7 required
LD A,REG3INS ; 8 Rx bits, Rx enable
JR NZ,SETBR
AND 07FH
;
SETBR: OUT (SPORT),A ; Set Rx bits
LD A,5 ; Select register 5
OUT (SPORT),A
LD A,(DATA) ; Set data bits
CP 7 ; But 7 if required
LD A,REG5INS ; 8 Tx bits, Tx enable, no RTS, DTR
JR NZ,SETBS
AND 0BFH
;
SETBS: OUT (SPORT),A ; Set tx bits
LD A,1 ; Select register 1
OUT (SPORT),A
LD A,REG1INS ; No interrupts
OUT (SPORT),A
LD A,47H
OUT (BAUDA),A
LD A,(BRATE) ; Set baud rate: get index
LD HL,BRVAL
LD C,A ; Rate to BC
LD B,0
ADD HL,BC
LD A,(HL) ; Get baud rate value
OR A ; 0 = invalid
JR Z,SETBRX
OUT (BAUDA),A
LD A,(BRATE) ; Tell zmp it's ok
LD (MSPEED),A
;
SETBRX: DS 0
;
; <== End of your own code
;
RET
;
; Baud rate factors, output to bauda to select baud rate
;
BD10 EQU 00H ; 110 baud rate 0
BD30 EQU 80H ; 300 baud rate 1
BD12 EQU 20H ; 1200 baud rate 5
BD24 EQU 10H ; 2400 baud rate 6
BD48 EQU 08H ; 4800 baud rate 7
BD96 EQU 04H ; 9600 baud rate 8
BD19K EQU 02H ; 19.2k baud rate 9
;
; Values for control reg for each baud rate: 0 if invalid
;
BRVAL:
;; 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12
DB 00,128,00,00,00,32,16,08,04,02,00,00,00,00
BRATE: DS 2 ; Baud rate:
; 0 = 110 baud 1 = 300 baud 2 = 450 baud
; 3 = 600 baud 4 = 710 baud 5 = 1200 baud
; 6 = 2400 baud 7 = 4800 baud 8 = 9600 baud
; 9 = 19200 baud 10 = 38400 baud 11 = 57600 baud
; 12 = 76800 baud 13 = 115200 baud
;
PARITY: DS 2 ; Parity (will be 'N', 'E' or 'O')
DATA: DS 2 ; Data bits (will be 7 or 8)
STOP: DS 2 ; Stop bits (will be 1 or 2)
;
;-----------------------------------------------------------------------
;
; Set the port. ZMP supplies either 0 or 1 as a parameter.
;
setport:
ld hl,2 ; get port number
add hl,sp
ex de,hl
call getparm ; in HL (values are 0 and 1)
; <== Insert your own code here
; <== End of your own code
ret
;
; Video terminal sequences: these are for ADM-3A: Modify as you wish
;
; Cursor addressing:
;
CURSADD:LD HL,2 ; Get parameters
ADD HL,SP
EX DE,HL
CALL GETPARM ; In HL
LD (ROW),HL ; Row
CALL GETPARM
LD (COL),HL ; Column
;
; <== Insert your own code here, using values in row and column
;
CALL PRINT
DB ESC,'=',0 ; ADM-3A leadin
LD A,(ROW) ; Row first
ADD A,' ' ; Add offset
CALL COUT
LD A,(COL) ; Sane for column
ADD A,' '
CALL COUT
;
; <== end of your own code
;
RET
;
ROW: DS 2 ; Row
COL: DS 2 ; Column
;
; Clear screen
;
CLS: CALL PRINT
DB 01AH,0
RET
;
; Inverse video on
;
INVON: CALL PRINT
DB ESC,')',0
RET
;
; Inverse video off
;
INVOFF: CALL PRINT
DB ESC,'(',0
RET
;
; Turn off cursor
;
HIDE: CALL PRINT
DB ESC,'z',0
RET
;
; Turn on cursor
;
SHOW: CALL PRINT
DB ESC,'v',0
RET
;
; Save cursor position
;
SAVECU: RET
;
; Restore cursor position
;
RESCU: RET
;
;-----------------------------------------------------------------------
;
;Service modem interrupt
;
MINT: RET ; My system doesn't need this
;
; Initialise interrupt vectors
;
INVEC: RET ; Ditto
;
; De-initialise interrupt vectors
;
DINVEC: RET ; Ditto
;
;------------------- End of user-defined code --------------------------
; Do not change anything below here
;
; Modem character test for 100 ms
;
MRD: PUSH BC ; Save BC
LD BC,100 ; Set limit
;
MRD1: CALL MIRDY ; Char at modem?
JR NZ,MRD2 ; Yes, exit
LD HL,1 ; Else wait 1 ms
CALL WAITHLMS
DEC BC ; Loop till done
LD A,B
OR C
JR NZ,MRD1
LD HL,0 ; None there, result=0
XOR A
;
MRD2: POP BC
RET
;
; Inline print routine: destroys A and HL
;
PRINT: EX (SP),HL ; Get address of string
;
PLOOP: LD A,(HL) ; Get next
INC HL ; Bump pointer
OR A ; Done if zero
JR Z,PDONE
CALL COUT ; Else print
JR PLOOP ; And loop
;
PDONE: EX (SP),HL ; Restore return address
RET ; And quit
;
; Output a character in A to the console
;
COUT: PUSH BC ; Save registers
PUSH DE
PUSH HL
LD E,A ; Character to E
LD C,2
CALL BDOS ; Print it
POP HL
POP DE
POP BC
RET
;
; Wait(seconds)
;
WAIT: LD HL,2
ADD HL,SP
EX DE,HL ; Get delay size
CALL GETPARM
; ; Fall thru to...
; Wait seconds in HL
;
WAITHLS:PUSH BC ; Save BC
PUSH DE ; DE
PUSH IX ; And IX
LD IX,0 ; Then point IX to 0
; ; so we don't upset memory-mapped I/O
;
; Calculate values for loop constants. Need to have two loops to avoid
; 16-bit overflow with clock speeds above 9 MHz.
;
OUTERVAL EQU (CLKSPD / 10) + 1
;
INNERVAL EQU (6667 / OUTERVAL) * CLKSPD
;
WAIT10: LD B,OUTERVAL
;
WAIT11: LD DE,INNERVAL
;
WAIT12: BIT 0,(IX) ; Time-wasters
BIT 0,(IX)
BIT 0,(IX) ; 20 T-states each
BIT 0,(IX)
BIT 0,(IX)
BIT 0,(IX)
DEC DE
LD A,E
LD A,D
OR E
JR NZ,WAIT12 ; 150 T-states per inner loop
DJNZ WAIT11 ; Decrement outer loop
DEC HL ; Ok, decrement count in HL
LD A,H
OR L
JR NZ,WAIT10
POP IX ; Done -- restore IX
POP DE ; DE
POP BC ; And BC
RET
;
; Wait milliseconds
;
MSWAIT: LD HL,2
ADD HL,SP
EX DE,HL ; Get delay size
CALL GETPARM
;
; Wait milliseconds in HL
;
WAITHLMS:
PUSH DE
;
W1MS0: LD DE,39 * CLKSPD
;
W1MS1: DEC DE
LD A,D
OR E
JR NZ,W1MS1
DEC HL
LD A,H
OR L
JR NZ,W1MS0
POP DE
RET
;
; Get next parameter from (DE) into HL
;
GETPARM:EX DE,HL ; Get address into HL
LD E,(HL) ; Get low
INC HL
LD D,(HL) ; Then hihi
INC HL ; Bump for next
EX DE,HL ; Result in HL, address still in DE
RET
;
;Get address of user-defined variables
;
GETVARS:
LD HL,USERVARS
RET
USERVARS:
DW OVERDRIVE ; .OVR etc. drive/user
DW OVERUSER
;
IF ($ - CODEBGN) GT OVSIZE
TOOBIG: JP ERRVAL ; Overlay is too large
ENDIF
;
END