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walnut-creek-CDROM
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CPM
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MODEMS
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ZMODEM
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ZMP-SRC.LBR
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ZMPOVL.MZC
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ZMPOVL.MAC
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Text File
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2000-06-30
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13KB
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583 lines
;
; System-dependent installation overlay for ZMP
;
; 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:
clkspd equ 2 ; Processor clock speed in MHz
mspeed equ 003ch ; Current baud rate: as used by BYE etc
; This MUST be the same as Mspeed in
; ZMP.H
;Set the following two equates to the drive and user area which will
; contain zmp's .OVR files, .CFG file and .FON file. Set both to zero
; to locate them on the drive from which zmp is invoked.
overdrive equ 'A' ; Drive to find overlays on. Range is 'A'-'P'
overuser equ 0 ; User area to find overlays
userdef equ 0145h ; 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
codebgn equ $
;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 variables
;Spare jumps for compatibility with future versions
jp spare ; spares for later use
jp spare ; spares for later use
jp spare ; spares for later use
jp spare ; spares for later use
jp spare ; spares for later use
;
; Main code starts here
;
;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: leave empty if not needed
userin:
ret
;User-defined exit routine: leave empty if not needed
userout:
ret
;Get a character from the modem: return in HL
mchin:
push bc
; <== Insert your own code here
ld b,0 ; get input character
call calmod ; in A
; <== End of your own code
ld l,a ; put in HL
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)
; <== Insert your own code here
push bc
ld b,2 ; output to modem
call calmod
pop bc
; <== End of your own code
ret ; done
;Test for output ready: return TRUE (1) in HL if ok
mordy:
; <== Insert your own code here
push bc
ld b,4
call calmod ; get status reg
pop bc
ld e,a ; save for test
and 010h ; get tx buffer empty flag in A
ld hl,1 ; assume ready
jr nz,mordy1
ld a,e ; ok, not ready. Is carrier there?
and 020h
jr nz,mordy1 ; no, fake it so we don't hang
dec hl ; otherwise say not ready
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
push bc
ld b,4 ; get status reg
call calmod
pop bc
and 08h ; 6551 bit 3
ld hl,0 ; assume not ready
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
push bc
ld b,8
call calmod ; get current ctl reg
push af ; save it
or 0ch ; set to send break
ld b,10
call calmod
; <== End of your own code
ld hl,300
call waithlms ; wait 300 mS
; <== Insert your own code here
pop af
ld b,10 ; restore original
call calmod
pop bc
; <== End of your own code
ret
;Test UART flags for error: return TRUE (1) in HL if error
mdmerr:
; <== Insert your own code here
push bc
ld b,4
call calmod ; get status reg
pop bc
and 07h ; mask off error bits
ld hl,0 ; assume not ready
jr z,mdmer1
inc hl ; otherwise set it
mdmer1:
; <== End of your own code
ld a,l ; set/clear Z
or a
; <== End of your own code
ret
;Turn DTR ON
dtron:
; <== Insert your own code here
push bc
ld b,8 ; get command reg
call calmod
and 0f0h
or 0bh ; set DTR & RTS on
ld b,10
call calmod
pop bc
; <== End of your own code
ret
;Turn DTR OFF
dtroff:
; <== Insert your own code here
push bc
ld b,8 ; get command reg
call calmod
and 0f0h ; set DTR and RTS off
ld b,10
call calmod
pop bc
; <== 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 ; baud rate
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
push bc
ld b,12 ; read ctl reg
call calmod ; to get old baud rate
and 0fh
ld e,a ; save in E
ld a,(data) ; get data bits
cp 7 ; if 7,
jr nz,setbits
set 5,e ; set bit 5
setbits:
ld a,(stop) ; get stop bits
cp 2
jr nz,setbrate ; if 2,
set 7,e ; set bit 7
setbrate:
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 ; invalid if zero
jr z,setctl
ld a,e ; ok, remove old one
and 0f0h
or (hl) ; add new baud rate
ld e,a
ld a,c ; restore id
ld (mspeed),a ; save for future use: this one's valid
setctl:
ld a,e ; value to a
or 010h ; internal b/r gen
ld b,14
call calmod ; set it up
ld a,(parity) ; do parity
ld e,060h ; assume even
cp 'E' ; even?
jr z,setpar ; yes
ld e,040h ; try odd
cp 'O'
jr z,setpar
ld e,0 ; none
setpar:
ld a,0bh ; RTS, DTR on
or e ; add parity
ld b,10
call calmod ; set it
pop bc
; <== End of your own code
ret
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
parity: ds 2 ; parity
data: ds 2 ; data bits
stop: ds 2 ; stop bits
;Values for 6551 control reg for each baud rate: 0 if invalid
brval:
db 3,6,0,7,0,8,10,12,14,15,0,0,0
;My system needs a BIOS call to access the UART. If yours doesn't, you don't
; need anything here. Otherwise write your own.
;Modify the next instruction to jump to the BIOS routine
calmod:
ld hl,(1) ; get BIOS address
ld l,0
ld de,036h ; add offset into BIOS jump table
add hl,de ; add to hl
ld (calmod+1),hl ; modify the code
push af ; save af
ld a,0c3h ; use jp instruction
ld (calmod),a
pop af ; restore A
jr calmod ; and do it
;****************************************************************************
;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 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:
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 ********************************
;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
;Get address of user-defined variables
getvars:
ld hl,uservars
ret
uservars:
dw overdrive ; all integer
dw overuser
if ($ - codebgn) gt ovsize
toobig: jp errval ; Overlay too large!
endif
end