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- ; ZMP-EP05.Z80 - Epson QX-10 overlay file for ZMP - 11-21-88
- ;
- ; Adapted by Larry Davis - Glendale Litera QBBS - 818/956-6164
- ;
- ; This file adapts ZMP version 1.5 to Epson QX-10 computers.
- ;
- ; Z80 SIO and 8253 baudrate generator
- ;
- ; System-dependent installation overlay for ZMP
- ; Author: Ron Murray
- ;
- ; 89/04/12 - Modified to ZMP v1.5 - George Conover
- ; Modified to v1.4 standard
- ; Modified to v1.3 standard rjm 12/10/88
- ;
- ; Insert your own code as necessary in this file. Code contained herein
- ; has been written in Z80 code for use with M80. Once assembled,
- ; convert to hex with RELHEX and use MLOAD to overlay it over the main
- ; ZMPX.COM file to produce your very own ZMP.COM.
- ;
- ; Notes on modifying this file:
- ; Hi-Tech C requires that functions do not change either index register
- ; (IX or IY). If your overlay requires either of these to be changed, ensure
- ; they are restored to their original values on return.
- ; Since collecting parameters from C functions can be tricky, only change
- ; the parts marked 'Insert your own code here'. Do NOT modify the jump
- ; table at the start. Do NOT modify the entry/exit sections of each
- ; function. Do NOT pass 'GO'. Do NOT collect $200.
- ; Apart from defining modem functions, this file also defines terminal
- ; characteristics. Most have been set up for ADM-3A (with a few of my own
- ; additions). Modify to suit your own terminal. An inline print routine
- ; is provided for printing strings in the usual way: usage is
- ;
- ; call print
- ; db 'required string',0
- ;
- ; Don't forget to set your clock speed at the clkspd variable.
- ;
- ; If you find your overlay exceeds the maximum size (currently 0400h),
- ; you will have to re-compile the whole thing. Good luck. You might try
- ; informing us if you need to do this: if too many people need to do it, we
- ; haven't allowed enough room.
- ;
- ; Ron Murray 15/8/88
- ;
-
- ;User-set variables:
- dport equ 11h ; data port
- sport equ dport+2 ; status port
- ;
- ;The following are used in setting up the Z80 SIO.
- ;
- rstins equ 18h ; Reset SIO - 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
- ;
- baud1 equ 06h ;8253 baudrate generator port
- baud2 equ baud1+1 ; Timer port
- ;
- clkspd equ 4 ; Processor clock speed in MHz
- mspeed equ 003ch ; Current baud rate: as used by BYE etc
- overdrive equ 'A' ; Drive to find overlay files on
- overuser equ 0 ; User area to find files
- ;
- userdef equ 00145h ; origin of this overlay: get this value
- ; from the .SYM file produced when ZMP.COM
- ; is linked
- 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
- jump_tab:
- 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)
- ;
- 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
-
- ;
- ; Main code starts here
- ;
- codebgn equ $
- ;
- ;Screen print function
- scrnpr:
- ; <== 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 TRUE (1) in HL if ok
- mordy:
- ; <== 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:
- ; <== End of your own code
- ld a,l ; set/clear Z
- or a
- ret
-
- ;Test for character at modem: return TRUE (1) in HL if so
- mirdy:
- ; <== 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:
- ; <== 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:
- ; <== 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 mS
-
- ; <== 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 TRUE (1) in HL if error
- mdmerr:
- ; <== 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:
- ; <== 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:
- ; <== 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 SIO - 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
- ;
- push ix
- ld de,(brate) ; set baud rate: get index
- ld ix,brval
- add ix,de
- add ix,de
- ld a,(ix)
- or (ix+1)
- jr z,setbrx
- ld a,0b6h
- out (baud2),a
- ld a,(ix)
- out (baud1),a
- ld a,(ix+1)
- out (baud1),a
- ld a,(brate) ; tell zmp it's ok
- ld (mspeed),a
- setbrx:
- pop ix
- ; <== End of your own code
- ret
- ;
- ;Baud rate factors, output to bauda to select baud rate
- ;
- brval:
- dw 0 ; 110 baud rate 0
- dw 416 ; 300 baud rate 1
- dw 0 ; 450 2
- dw 0 ; 600 3
- dw 0 ; 710 4
- dw 104 ; 1200 baud rate 5
- dw 52 ; 2400 baud rate 6
- dw 26 ; 4800 baud rate 7
- dw 13 ; 9600 baud rate 8
- dw 0 ; 19200 9
- dw 0 ; 38400 10
- dw 0 ; 11
- ;
- brate: dw 6 ; baud rate:
- parity: dw 'N'
- data: dw 8 ; data bits (will be 7 or 8)
- stop: dw 1 ; 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
- ; Highlighting/Reverse video not enabled for QX-10 since it differs from
- ; CP/M to TPM.
- ;
- ;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 col
- 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:
- RET
- call print
- db esc,')',0
- ret
-
- ;Inverse video off:
- invoff:
- RET
- call print
- db esc,'(',0
- ret
-
- ;Turn off cursor:
- hide:
- RET
- call print
- db esc,'z',0
- ret
-
- ;Turn on cursor:
- show:
- RET
- 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 ********************************
- ; Don't change anything below this point. We needed some assembly language
- ; stuff for speed, and this seemed like a good place to put it.
-
- ;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 1ms
- 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 regs
- 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
- ; fall thru to..
- ;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 lo
- inc hl
- ld d,(hl) ; then hi
- inc hl ; bump for next
- ex de,hl ; result in hl, address still in de
- ret
- ;
- getvars:
- ld hl,uservars
- ret
- ;
- uservars:
- dw overdrive
- dw uservars
- ;
- if ($ - codebgn) gt ovsize
- toobig: jp errval ; Overlay too large!
- endif
-
- end