VTEmulator#
General Information
Author: Charles Green
Language: ACTION!
Compiler/Interpreter: ACTION!
Published: usenet
Well, I've gotten enough responses that I'd annoy my UUCP neighbor by mailing this file out that many times, so I guess it'll be better to post it.
A couple of things I never got around to doing:
- Adding a character count to the data in each line, maybe in the byte just before the 320-byte area where the characters for each line are "stenciled" in for display. This count could be used to speed up the insert-character and clear-to-end-of-line operations; they'd no longer have to go all the way out to column 80 if there was no data displayed out that far.
- Adding a single graphics-0 display line, either at the top or bottom of the screen, which could hold the current baud
- Smooth scrolling.
Enjoy, Charles Green char...@c3.COM
;''''''''''''''''''''''''''''''''''''
; "TVI925.ACT" - A display-list based
; terminal emulator by Charles Green.
;
; Derived from the public domain VT52+
; emulator written by Michael Jenkin.
;,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
MODULE
;A: handler, originally by Jenkin.
DEFINE LDY = "$A0",
RTS = "$60", JMP = "$4C", PLA="$68",
GR8 = "$0F", SKIP8 = "$70",
JVP = "$41", LMS = "$40", RTI="$40",
ESC = "1", CUP = "2", SGR = "3",
PHA= "$48", TAX= "$AA", TXA= "$8A",
TAY="$A8",TYA="$98",
CMO = "4",
XITVBV = "$E462"
TYPE line = [BYTE mode
CARD adrs]
BYTE ARRAY display(8831) ;data+dlist
BYTE ARRAY enhance(8), cursor(4)
line POINTER dlist
BYTE POINTER curln ;current line data
BYTE pmbase = $D407, gractl=$D01D,
lmargin = $52, rmargin = $53,
rowcrs = $54, colcrs = $55, brkcnt,
gprior = $26F, pcolr0 = $2C0,
audc1 =$D201, hposm0 = $D004,
sdmctl = $22F, soundr = $41, saudc1,
; audf1 = $D200,
; sskctl = $232,
skctl = $D20F,
state, need, needx, ins_mode, curcnt
CARD
; savmsc = $58,
sdlist = $230,cursad,keydef = $79,
vvblkd = $224, brkky = $236
BYTE ARRAY xlate = [ ; New kbd map
$6C $6A $3B $80 $80 $6B $2B $2A
$6F $80 $70 $75 $0D $69 $2D $3D
$76 $FF $63 $80 $80 $62 $78 $7A
$34 $80 $33 $36 $1B $35 $32 $31
$2C $20 $2E $6E $80 $6D $2F $7E
$72 $80 $65 $79 $09 $74 $77 $71
$39 $80 $30 $37 $08 $38 $3C $3E
$66 $68 $64 $80 $82 $67 $73 $61 ;lowr
$4C $4A $3A $80 $80 $4B $5C $5E
$4F $80 $50 $55 $0D $49 $5F $7C
$56 $FF $43 $80 $80 $42 $58 $5A
$24 $80 $23 $26 $1B $25 $22 $21
$5B $20 $5D $4E $80 $4D $3F $60
$52 $80 $45 $59 $FE $54 $57 $51
$28 $80 $29 $27 $7F $40 $7B $7D
$46 $48 $44 $80 $82 $47 $53 $41 ;uper
$0C $0A $F0 $80 $80 $0B $1C $1E
$F0 $80 $10 $15 $0A $09 $1F $F0
$16 $FF $03 $80 $80 $02 $18 $1A
$F0 $80 $F0 $F0 $1B $F0 $F0 $F0
$1B $00 $1D $0E $80 $0D $7F $F0
$12 $80 $05 $19 $FD $14 $17 $11
$F0 $80 $F0 $F0 $7F $00 $F0 $F0
$06 $08 $04 $80 $82 $07 $13 $01 ;ctrl
]
PROC vbi()
IF curcnt = 0 THEN
pcolr0 ==! 5 ;invert cursor
curcnt = 15
ELSEIF curcnt < 255 THEN
curcnt ==- 1
FI
IF saudc1 > $E0 THEN
saudc1 ==- 1
audc1 = saudc1
; SOUND(2,100,14,bel)
FI
IF brkcnt THEN
brkcnt ==- 1
IF brkcnt = 0 THEN
; sskctl ==& $7F ;remove force space
; skctl = sskctl
skctl = $73
FI
FI
[JMP XITVBV]
PROC brk() ;break interrupt handler
; [TYA PHA TXA PHA]
brkcnt = 15;
; sskctl ==% $80 ;force serial space
; skctl = sskctl
skctl = $F3
; [PLA TAX PLA TAY]
[PLA RTI]
PROC del_ch(BYTE POINTER adr, BYTE col)
BYTE POINTER badr,wadr
BYTE x, y, bcount
bcount = (80-col) RSH 1
FOR y = 1 TO 7
DO
adr ==+ 40
wadr = adr + (col RSH 1) - 1
badr = wadr + 1
IF col & 1 THEN
badr ==+ 1
wadr ==+ 1
wadr^ =(wadr^ & $F0)%(badr^ RSH 4)
FI
x = bcount
WHILE x > 0
DO
badr ==+ 1
wadr ==+ 1
wadr^ =(wadr^ LSH 4)%(badr^ RSH 4)
x ==- 1
OD
wadr^ ==& $F0
OD
RETURN ; null proc for now
PROC ins_ch(BYTE POINTER adr, BYTE col)
BYTE POINTER badr,wadr
BYTE x, y, bcount
bcount = (79-col) RSH 1
FOR y = 1 TO 7
DO
adr ==+ 40
badr = adr + 39
wadr = badr - 1
x = bcount
WHILE x > 0
DO
badr^ =(wadr^ LSH 4)%(badr^ RSH 4)
x ==- 1
badr ==- 1
wadr ==- 1
OD
IF col & 1 THEN
badr^ ==& $F0
ELSE
badr^ ==RSH 4
FI
OD
RETURN ; null proc for now
PROC Achr(BYTE cx, cy, cc)
BYTE POINTER base, offset
BYTE i, chr, c
BYTE ARRAY chset = [
$00 $00 $00 $00 $00 $00 $00 ; SP
$44 $44 $44 $00 $44 $00 $00
$AA $AA $00 $00 $00 $00 $00
$AA $EE $AA $EE $AA $00 $00
$EE $CC $EE $66 $EE $00 $00
$AA $22 $44 $88 $AA $00 $00
$CC $44 $CC $EE $EE $00 $00
$66 $22 $44 $00 $00 $00 $00
$22 $44 $44 $44 $22 $00 $00
$88 $44 $44 $44 $88 $00 $00
$00 $AA $EE $AA $00 $00 $00
$00 $44 $EE $44 $00 $00 $00
$00 $00 $00 $66 $22 $44 $00
$00 $00 $EE $00 $00 $00 $00
$00 $00 $00 $66 $66 $00 $00
$22 $22 $44 $44 $88 $88 $00
$44 $AA $AA $AA $44 $00 $00 ;'0'
$44 $CC $44 $44 $EE $00 $00
$CC $22 $44 $88 $EE $00 $00
$CC $22 $44 $22 $CC $00 $00
$AA $AA $EE $22 $22 $00 $00
$EE $88 $CC $22 $CC $00 $00
$44 $88 $EE $AA $44 $00 $00
$EE $22 $44 $88 $88 $00 $00
$44 $AA $44 $AA $44 $00 $00
$44 $AA $66 $22 $44 $00 $00
$66 $66 $00 $66 $66 $00 $00
$66 $66 $00 $66 $22 $44 $00
$22 $44 $88 $44 $22 $00 $00
$00 $EE $00 $EE $00 $00 $00
$88 $44 $22 $44 $88 $00 $00
$CC $22 $44 $00 $44 $00 $00
$44 $AA $AA $88 $66 $00 $00 ;'@'
$44 $AA $EE $AA $AA $00 $00
$CC $AA $CC $AA $CC $00 $00
$66 $88 $88 $88 $66 $00 $00
$CC $AA $AA $AA $CC $00 $00
$EE $88 $CC $88 $EE $00 $00
$EE $88 $CC $88 $88 $00 $00
$66 $88 $AA $AA $66 $00 $00
$AA $AA $EE $AA $AA $00 $00
$EE $44 $44 $44 $EE $00 $00
$66 $22 $22 $AA $EE $00 $00
$AA $CC $88 $CC $AA $00 $00
$88 $88 $88 $88 $EE $00 $00
$AA $EE $EE $AA $AA $00 $00
$CC $AA $AA $AA $AA $00 $00
$66 $AA $AA $AA $CC $00 $00
$CC $AA $CC $88 $88 $00 $00 ;'P'
$66 $AA $AA $AA $EE $22 $00
$CC $AA $CC $CC $AA $00 $00
$66 $88 $CC $22 $EE $00 $00
$EE $44 $44 $44 $44 $00 $00
$AA $AA $AA $AA $66 $00 $00
$AA $AA $AA $44 $44 $00 $00
$AA $AA $EE $EE $AA $00 $00
$AA $AA $44 $AA $AA $00 $00
$AA $AA $44 $44 $44 $00 $00
$EE $22 $44 $88 $EE $00 $00
$66 $44 $44 $44 $66 $00 $00
$88 $88 $44 $44 $22 $22 $00
$CC $44 $44 $44 $CC $00 $00
$44 $AA $00 $00 $00 $00 $00
$00 $00 $00 $00 $EE $00 $00
$66 $44 $22 $00 $00 $00 $00
$00 $CC $66 $AA $66 $00 $00 ;'a'
$88 $CC $AA $AA $CC $00 $00
$00 $66 $88 $88 $66 $00 $00
$22 $66 $AA $AA $66 $00 $00
$00 $EE $EE $88 $66 $00 $00
$22 $44 $EE $44 $44 $00 $00
$00 $66 $AA $AA $66 $22 $CC
$88 $EE $AA $AA $AA $00 $00
$44 $00 $CC $44 $EE $00 $00
$44 $00 $CC $44 $44 $88 $00
$88 $88 $AA $CC $AA $00 $00
$CC $44 $44 $44 $EE $00 $00
$00 $CC $EE $EE $AA $00 $00
$00 $CC $AA $AA $AA $00 $00
$00 $66 $AA $AA $CC $00 $00
$00 $CC $AA $AA $CC $88 $88 ;'p'
$00 $66 $AA $AA $66 $22 $22
$00 $EE $88 $88 $88 $00 $00
$00 $CC $EE $22 $CC $00 $00
$44 $EE $44 $44 $44 $00 $00
$00 $AA $AA $AA $66 $00 $00
$00 $AA $AA $44 $44 $00 $00
$00 $AA $EE $EE $66 $00 $00
$00 $AA $44 $AA $AA $00 $00
$00 $AA $AA $AA $66 $22 $CC
$00 $EE $44 $88 $EE $00 $00
$66 $44 $88 $44 $66 $00 $00
$44 $44 $44 $44 $44 $00 $00
$CC $44 $22 $44 $CC $00 $00
$CC $66 $00 $00 $00 $00 $00
$AA $44 $AA $44 $AA $44 $AA
]
;strip high bit (inverse video)
offset = cc - $20
;display character
dlist=sdlist + cy * 10 + 3
base = dlist.adrs + (cx RSH 1) + 40
IF ins_mode THEN
ins_ch(dlist.adrs, cx)
FI
offset = chset+(offset LSH 3)-offset
FOR i = 1 TO 7
DO
c = offset^
c = c XOR enhance(i)
chr = base^
IF (cx & 1) THEN
c ==& $0F
chr ==& $F0
ELSE
c ==& $F0
chr ==& $0F
FI
base^ = chr % c
base ==+ 40
offset ==+1
OD
RETURN
PROC Acurse(); move cursor
BYTE old_y ;Where we left cursor
Zero(cursad+(old_y LSH 2), 4)
hposm0 = (colcrs LSH 1) + 48
MoveBlock(cursad+(rowcrs LSH 2),cursor,4)
old_y = rowcrs ;memory for later clr
pcolr0=5
IF curcnt < 255 THEN
curcnt=254
FI
RETURN
PROC scroll(BYTE first, last)
line POINTER tdlist
CARD tempadrs
INT delta
BYTE i
dlist=sdlist+3 + first*10
tempadrs=dlist.adrs
Zero(tempadrs,320)
IF first>last THEN
i=first
first=last
last=i
delta=-1
ELSE
delta=1
FI
FOR i=first+1 TO last
DO
tdlist = dlist+10 *delta
dlist.adrs = tdlist.adrs
dlist = tdlist
OD
dlist.adrs = tempadrs
RETURN
PROC Amargin() ; keep between margins
IF colcrs > rmargin THEN
colcrs = lmargin
rowcrs ==+ 1
FI ;fallthrough to Ascroll()
PROC Ascroll() ; roll screen if req'd
IF rowcrs > 23 THEN
scroll(0,23)
rowcrs = 23
FI
RETURN
PROC curpos(BYTE chr)
IF need = 2 THEN ; 1st ESC Y
needx = chr - $20
need ==- 1
ELSEIF need = 1 THEN ; 2nd ESC Y
chr ==- $20
IF (needx <= 23) AND (chr <= rmargin) THEN
colcrs = chr
rowcrs = needx
; Acurse()
FI
state = 0
FI
RETURN
PROC cursat(BYTE chr) ;cursor type
IF chr = '2 THEN ;blinking block?
curcnt = 254
SetBlock(cursor,4,3)
ELSEIF chr = '4 THEN ;steady line?
curcnt = 255
SetBlock(cursor,3,0)
cursor(3) = 3
FI
pcolr0=5 ;third-intensity cursor
state=0
RETURN
PROC attrib(BYTE chr) ; enhance
IF chr = '0 THEN
Zero(enhance, 8)
ELSEIF chr = '4 THEN ; reverse
SetBlock(enhance, 8, $FF)
ELSEIF chr = '8 THEN ; underline
Zero(enhance, 8)
enhance(6) = $FF
ELSEIF chr = '> THEN ; both modes
SetBlock(enhance, 8, $FF)
enhance(6) = $00
FI
state = 0
RETURN
PROC Aesc(BYTE chr) ; escape sequence
BYTE ch
CARD i
IF chr = 'E THEN ; insert line
dlist=sdlist+3+rowcrs*10
scroll(23,rowcrs)
ELSEIF chr = '. THEN ; cursor attrib
state = CMO ; cursor rendition
RETURN
ELSEIF chr = 'G THEN ; inverse off
state = SGR ; select rendition
RETURN
ELSEIF chr = 'I THEN ; back tab
colcrs = (colcrs - 1) & $F8
ELSEIF chr = 'j THEN ; reverse lf
IF rowcrs > 0 THEN
rowcrs ==- 1
ELSE
scroll(23,0)
FI
; Acurse()
ELSEIF chr = '* THEN ; home & clear
rowcrs = 0
colcrs = 0
Aesc('Y)
; erase to EOS ( y?? )
ELSEIF chr = 'Y OR chr = 'y THEN
FOR ch = colcrs TO 79
DO
Achr(ch,rowcrs,' )
OD
IF rowcrs < 23 THEN
dlist=sdlist+3+10*rowcrs
FOR i = rowcrs+1 TO 23
DO
dlist==+ 10
Zero(dlist.adrs,320)
OD
FI
; Acurse()
; erase to EOL
ELSEIF chr = 'T OR chr = 't THEN
FOR ch = colcrs TO 79
DO
Achr(ch,rowcrs,' )
OD
; Acurse()
ELSEIF chr = 'R THEN ; delete line
dlist=sdlist+3+10*rowcrs
scroll(rowcrs,23)
ELSEIF chr = '= THEN ; cursor addr
state = CUP
need = 2
RETURN
ELSEIF chr = 'Q THEN ; insert char
dlist=sdlist+3+10*rowcrs
ins_ch(dlist.adrs,colcrs)
ELSEIF chr = 'W THEN ; delete char
dlist=sdlist+3+10*rowcrs
del_ch(dlist.adrs,colcrs)
ELSEIF chr = 'Z THEN ; multi-insert
ins_mode = 1;
ELSEIF chr = 'r THEN ; end multi-ins
ins_mode = 0;
ELSEIF chr = 'b THEN ; BlackOnWhite
SetColor(2,0,15)
SetColor(1,0,0)
ELSEIF chr = 'd THEN ; WhiteOnBlack
SetColor(2,0,0)
SetColor(1,0,15)
FI
state = 0
RETURN
PROC Aopen()
BYTE i
sdmctl=0 ;No Antic DMA till DL ready
vvblkd=vbi ;Put our vbi routine in
brkky=brk ;Put our break routine in
; Examine data array for alignment
sdlist=(display & $F000) + $1C80
pmbase=sdlist RSH 8 ;page of plr/mis
cursad=sdlist+$100
dlist=sdlist
FOR i = 0 TO 2 DO
dlist.mode = SKIP8
dlist==+1
OD
curln=display
FOR i=0 TO 23 DO
IF (curln = sdlist) THEN
curln==+ $180
FI
IF (curln & $FFF) > $EC0 THEN
curln = (curln & $F000) + $1000
FI
dlist.mode = GR8 + LMS
dlist.adrs = curln
SetBlock(dlist+3,7,GR8)
curln==+ 320
dlist ==+ 10
OD
dlist.mode = JVP
dlist.adrs = sdlist
SetColor(2,0,0) ; was 0,0,0
SetColor(1,0,15) ; was 1,12,15
SetColor(4,0,2) ; new - border
gprior=8 ;cursor behind letters
gractl=1 ;turn missiles on
sdmctl=$26 ;enable missile DMA
Zero(cursad,128) ;clear missile data
cursad ==+ 16 ;true top of screen
state = 0
lmargin = 0
rmargin = 79
rowcrs = 0
colcrs = 0
Acurse()
attrib('0) ;normal video
cursat('4) ;normal cursor
[LDY 1 RTS]
PROC Aclose()
[LDY 1 RTS]
PROC Aput(BYTE areg)
IF state = ESC THEN; escape sequence
Aesc(areg)
ELSEIF state = CUP THEN ; cursor pos
curpos(areg)
ELSEIF state = CMO THEN ; curs enhnc
cursat(areg)
ELSEIF state = SGR THEN ; enhance
attrib(areg)
ELSEIF areg = $1B THEN ; ESC
state = ESC
ELSEIF areg = $1A THEN ; ClearScreen
colcrs = 0
rowcrs = 0
Aesc('Y)
ELSEIF areg = $1E THEN ; home
colcrs = 0
rowcrs = 0
; Acurse()
ELSEIF areg = $0B THEN ; cursor up
IF rowcrs > 0 THEN
rowcrs ==- 1
; Acurse()
FI
ELSEIF areg = $16 THEN ; cursor down
IF rowcrs < 23 THEN
rowcrs ==+ 1
; Acurse()
FI
ELSEIF areg = $0C THEN ; cursor right
IF colcrs < rmargin THEN
colcrs ==+ 1
; Acurse()
FI
ELSEIF areg = $0D THEN ; CR
colcrs = lmargin ; was = 0
ELSEIF areg = $0A THEN ; lf
rowcrs ==+ 1
IF colcrs > rmargin THEN
colcrs = 0 ;altos vi kludge
FI
Ascroll()
ELSEIF areg = $08 THEN ; BS
IF colcrs > lmargin THEN ;was >0
colcrs ==- 1
ELSEIF rowcrs > 0 THEN ;bs wraps
colcrs = rmargin
rowcrs==- 1
FI
ELSEIF areg = $07 THEN ; bell
saudc1 = $F0
; bel = 16 ; vbi() will pickup
ELSEIF areg = $09 THEN ; TAB
colcrs = (colcrs + 8) & $F8
Amargin()
ELSEIF areg > $1F THEN ;printable
Amargin() ;new here
Achr(colcrs,rowcrs,areg)
colcrs ==+ 1
;ELSE unrecognized control-nothing
FI
Acurse() ;update cursor
[LDY 1 RTS]
PROC Anofunc()
[RTS]
PROC Adummy()
[LDY 1 RTS]
PROC Ahandler()
BYTE ARRAY hatabs = $031A
BYTE pos, found
;do not change the following 3 lines
CARD ARRAY atab(6)
BYTE Jump = [JMP]
CARD init
; define device entry points
atab(0) = Aopen - 1 ;OPEN
atab(1) = Aclose - 1 ;CLOSE
atab(2) = Anofunc - 1 ;READ
atab(3) = Aput - 1 ;WRITE
atab(4) = Adummy - 1 ;STATUS
atab(5) = Anofunc - 1 ;SPECIAL
init = Adummy ;INIT
; find entry in hatabs
found = 0;
pos = 0
WHILE (pos < 34) AND (found = 0)
DO
IF hatabs(pos) = 0 THEN
found = 1
ELSE
pos ==+ 3
FI
OD
IF found = 0 THEN
PrintE("*** A: too many devices")
ELSE
hatabs(pos) = 'A
hatabs(pos + 1) = atab & 255
hatabs(pos + 2) = atab RSH 8
FI
RETURN
;*******************************
;* MAIN PROGRAM
;*******************************
MODULE
BYTE
ch = $02FC,
bcount = $02EB,
speed = [3], ;CWG 1=300BPS 3=1200
wsize = [0],
sbits = [0],
lf = [0],
iparity = [0],
oparity = [0]
PROC init_R(); set options for R:
Close(3)
Open(3,"R:",13,0)
XIO(3,0,38,lf*64+32+iparity*4+oparity,0,"R1:") ;32=no xlate
XIO(3,0,36,speed+7+wsize*16+128*sbits,0,"R1:")
XIO(3,0,34,192,0,"R1:")
XIO(3,0,40,0,0,"R1:") ;concurrent IO
bcount = 0
RETURN
PROC init_A(); set up A: device
Ahandler() ; install A: handler
Close(2)
; Graphics(8+16)
Open(2,"A:",8,0)
RETURN
PROC intro()
soundr=0
Close(7)
Open(7,"K:",4,0)
keydef = xlate ; load key translate
init_R()
init_A()
soundr=0
RETURN
PROC do_remote(); process remote
BYTE chr
BYTE stop = [0]
BYTE HIWAT = [128]
XIO(3,0,13,0,0,"R:")
IF bcount > HIWAT THEN
PutD(3,$13) ;XOFF
stop=1
FI
WHILE bcount > 0
DO
chr = GetD(3)
PutD(2,chr & $7F)
bcount ==- 1
OD
IF stop THEN
PutD(3,$11) ;XON
stop=0
FI
RETURN
PROC do_local(); process local
BYTE chr
IF $FF - ch THEN ;INPUT
chr = GetD(7)
PutD(3,chr)
FI ; END IF CHAR
RETURN
PROC main()
intro()
DO
do_remote()
do_local()
OD
RETURN
