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ZMO-MB01.MAC
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Text File
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1979-12-31
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14KB
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651 lines
;-----------------------------------------------------------------------------
;
; ZMP (Z-Modem Program) Overlay for 56k Microbee
;
; Name ZMO-MB01.Z80
;
; Dated Dec 11, 1988
;
; Written by -
; Ron Murray, c/o Z-Node 62, 061-9-450-0200, Perth, Western Australia.
; - Based on George Hansper's MEX overlay
;
;
;-----------------------------------------------------------------------------
;
;
; System-dependent code overlay for ZMODEM
;
;
;
; Insert your own code as necessary in this file. Code contained herein
; has been written in Z80 code for use with M80 or SLR. Assemble as follows:
;
; SLR ZMO-xx01/h
; MLOAD ZMP.COM=ZMODEM.COM,ZMO-xx01.HEX
; or
; M80 =ZMO-xx01.Z80
; RELHEX ZMO-xx01
; MLOAD ZMP.COM=ZMODEM.COM,ZMO-xx01.HEX
;
;
; (Don't use L80 without changing the source for assembly as a
; cseg file.)
;
;-----------------------------------------------------------------------------
;
;
; Notes on modifying this file:
;
; 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 the 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. Examples provided are 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 contact me for another version. If too many people need
; to do it, we haven't allowed enough room.
;
; Ron Murray 15/8/88
;
;
;
;---------------------------------------------------------------------------
false equ 0
true equ not false
;------------------------------------------------------------------------------
; User-set variables:
clkspd equ 4 ; Processor clock speed in MHz
debug equ false ; to allow debugging of overlay with Z8E etc.
;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 'B' ; Drive to find overlay files on ('A'-'P')
overuser equ 0 ; User area to find files
;------------------------------------------------------------------------------
; NOT user-set variables
userdef equ 0145h ; origin of this overlay
; This address should not change with
; subsequent revisions.
mspeed equ 03ch ; location of current baud rate.
ovsize equ 0400h ; max size of this overlay
.z80 ; use z80 code
aseg ; absolute
if debug
org 100h ; so you can debug it with cebug, zsid, etc
else
org userdef
endif
esc equ 1bh
ctrlq equ 11h
cr equ 0dh
lf equ 0ah
bdos equ 5
;rsx calls
status equ 51 ; modem status
odata equ 52 ; data out
idata equ 53 ; data in
;location of Port B interrupt vector (as used by your operating system):
;INTVCB equ 50h ;Dreamdisk (ROM v2.18)
INTVCB equ 0DF4Ah ;Applied Tech. (64k Adv Pers Communicator)
;INTVCB equ 0E8E2h ;Applied Tech. (128k)
;
; Z80 PIO equates:
DATAB equ 2 ;PIO port B data
CTLB equ 3 ; " " " control
DTR equ 4 ;DTR output on bit 2
RSOUT equ 20h ;RS-232 " " " 5
CTS equ 8 ;CTS input " " 3
RSIN equ 10h ;RS-232 " " " 4
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 system variables
; 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
;
; 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
push ix
push iy
ld de,00ffh ; ensure in range
ld c,idata
call bdos
pop iy
pop ix
; <== End of your own code
ld a,l ; put in A
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 e,(hl)
; <== Insert your own code here
push ix
push iy
ld d,080h ; ensure we don't upset the rsx
ld c,odata
call bdos
pop iy
pop ix
; <== 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 ix
push iy
ld de,08000h
ld c,status
call bdos ; get status reg
ld a,l ; get result
ld hl,0
and 010h ; TDRE?
jr z,mordy1
inc hl ; yes
mordy1:
pop iy
pop ix
; <== 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
push ix
push iy
ld de,08000h
ld c,status
call bdos ; get status reg
ld a,l ; get result
ld hl,0
and 08h ; RDRF?
jr z,mirdy1
inc hl ; yes
mirdy1:
pop iy
pop ix
pop bc
; <== 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
ld hl,300 ; wait 300 mS
call waithlms
; <== End of your own code
ret
;
;Test UART flags for error: return TRUE (1) in HL if error.
mdmerr:
; <== Insert your own code here
ld hl,0
; <== End of your own code
ld a,l ; set/clear Z
or a
ret
;Turn DTR ON
dtron:
; <== Insert your own code here
ld a,DTR+RSOUT ; DTR high, RSOUT low
out (DATAB),a
; <== End of your own code
ret
;Turn DTR OFF
dtroff:
; <== Insert your own code here
ld a,RSOUT ; DTR low, RSOUT low
out (DATAB),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 ; baud rate
call getparm
ld (parity),hl ; parity
call getparm
ld (data),hl ; data bits (BINARY 7 or 8)
call getparm
ld (stop),hl ; stop bits (BINARY 1 or 2)
; <== Insert your own code here
; using values below
; don't forget to load mspeed with the
; current brate value if the new rate is
; valid. See table of values below.
push ix
ld hl,(brate) ; do baud rate
ld a,l ; if > 10,
cp 10
jr nc,setpar ; ignore
ld (mspeed),a ; ok
ld de,btable ; get delay for this speed
add hl,de
ld a,(hl)
ld ix,(baud)
ld (ix),a
ld (ix+1),a ; put in upper and lower byte
setpar:
ld a,(parity)
ld c,1
cp 'N'
jr z,setpr1 ; none = 1
inc c
cp 'O'
jr z,setpr1 ; odd = 2
inc c ; even = 3
cp 'E'
jr z,setpr1
ld c,1 ; default to none
setpr1:
ld ix,(bparity)
ld (ix),a
setdata:
ld a,(data)
and 0fh
cp 7 ; only 7 or 8
jr z,setdat1
cp 8
jr z,setdat1
ld a,8 ; default to 8
setdat1:
ld ix,(ndata)
ld (ix),a
ld ix,(bparity)
ld b,(ix)
dec b
jr z,setdt1 ; parity = none
inc a ; parity = odd,even
setdt1:
ld ix,(npdata)
ld (ix),a ; = no of data bits + parity bit
setstop:
ld a,(stop) ; set stop bits
ld ix,(stopbits)
and 07h ; either binary 1 or 2
ld (ix),a
pop ix
; <== End of your own code
ret
;--------------------------------------------------------------------------
stop: dw 1 ; stop bits
parity: dw 'N' ; parity
data: dw 8 ; data bits
brate: dw 7 ; baud rate:
;--------------------------------------------------------------------------
;Values of brate for each baud rate
;
; baud rate brate delay
;
; 110 0 170
; 300 1 64
; 450 2 43
; 600 3 32
; 710 4 27
; 1200 5 16
; 2400 6 8
; 4800 7 4
; 9600 8 2
; 19200 9 1
; 38400 10 ---
; 57600 11 ---
; 76800 12 ---
;
btable:
db 170,64,43,32,27,16,8,4,2,1
;****************************************************************************
;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 1ah,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:
ret
;Turn on cursor:
show:
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
if ($ - codebgn) gt ovsize
toobig: jp errval ; Overlay too large!
endif
end