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Revision: 1.34
Committed: Wed Dec 9 09:23:52 2015 UTC (8 years, 4 months ago) by root
Branch: MAIN
CVS Tags: HEAD
Changes since 1.33: +10 -10 lines
Log Message:
*** empty log message ***

File Contents

# Content
1 #!/opt/bin/perl
2
3 #
4 # Copyright(C) 2014 Marc Alexander Lehmann <vt102@schmorp.de>
5 #
6 # vt102 is free software; you can redistribute it and/or modify it under
7 # the terms of the GNU General Public License as published by the Free
8 # Software Foundation; either version 3, or (at your option) any later
9 # version.
10 #
11 # vt102 is distributed in the hope that it will be useful, but WITHOUT
12 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 # for more details.
15 #
16
17 # If this file contains embedded ROMs, the above copyright notice does
18 # not apply to them.
19
20 use 5.010;
21 use strict;
22 use integer;
23 #use common::sense;
24
25 my $VT102 = 1;
26 my $VT131 = 0;
27 my $AVO = 1;
28
29 shift, ($VT102 = 0), ($AVO = 0) if $ARGV[0] =~ /^-?-vt100$/;
30 shift, ($VT102 = 0) if $ARGV[0] =~ /^-?-vt100\+avo$/;
31 shift if $ARGV[0] =~ /^-?-vt102$/;
32 shift, ($VT131 = 1) if $ARGV[0] =~ /^-?-vt131$/;
33
34 # vt100 wps = word processing roms
35 # vt101 = vt102 - avo, but custom rom? really?
36 # vt103 = vt100 + tu58 tape drive
37 # vt125 = vt100 + gpo graphics processor
38 # vt132 = vt100 + avo, stp
39 # vt180 = vt100 + z80 cp/m
40
41 if ($ARGV[0] =~ /^-/) {
42 die <<EOF;
43
44 VT102, A VT100/102/131 SIMULATOR
45
46 Usage:
47
48 $0 [option] [program [args]]
49
50 Examples:
51
52 $0 bash
53 $0 telnet towel.blinkenlights.nl
54 $0 curl http://artscene.textfiles.com/vt100/trekvid.vt
55 $0 curl http://artscene.textfiles.com/vt100/surf.vt # in 3d!
56
57 Option can be one of:
58
59 --vt100
60 --vt100+avo
61 --vt102
62 --vt131
63
64 Non-obvious special keys are:
65
66 SET UP Home
67 BACKSPACE Rubout
68 CAPS LOCK Prior/PgUp
69 NO SCROLL Next/PgDown
70 BREAK End
71 CTRL-C Insert
72
73 Set-Up Guide:
74
75 http://vt100.net/docs/vt102-ug/chapter3.html#S3.6
76
77 Author:
78
79 Marc Lehmann <vt102\@schmorp.de>
80
81 EOF
82 }
83
84 #############################################################################
85 # ROM/hardware init
86
87 my $PTY; # the pty we allocated, if any
88 my $KBD = 1;
89
90 my $ROMS = do {
91 binmode DATA;
92 local $/;
93 <DATA>
94 };
95
96 0x6801 == length $ROMS or die "corrupted rom image";
97
98 my @M = (0xff) x 65536; # main memory
99
100 # populate mem with rom contents
101 if ($VT102) {
102 @M[0x0000 .. 0x1fff] = unpack "C*", substr $ROMS, 0x2000, 0x2000;
103 @M[0x8000 .. 0x9fff] = unpack "C*", substr $ROMS, 0x4000, 0x2000;
104 @M[0xa000 .. 0xa7ff] = unpack "C*", substr $ROMS, 0x6000, 0x0800 if $VT131;
105 } else {
106 @M[0x0000 .. 0x1fff] = unpack "C*", substr $ROMS, 0x0000, 0x2000;
107 }
108
109 #############################################################################
110 # 8085 CPU registers and I/O support
111
112 # 8080/8085 registers
113 my ($A, $B, $C, $D, $E, $H, $L); # 8 bit general purpose
114 my ($PC, $SP, $IFF); # program counter, stack pointer, interrupt flag
115 my ($FA, $FZ, $FS, $FP, $FC); # condition codes (psw)
116
117 my $RST = 0; # pending interrupts (external interrupt logic)
118 my $INTMASK = 7; # 8085 half interrupt mask
119 my $INTPEND = 0; # 8085 half interrupts pending
120
121 my $CLK; # rather inexact clock, counts extended basic blocks
122
123 #############################################################################
124 # the dreaded NVR1400 chip. not needed to get it going, but provided anyway
125
126 # nvram
127 my @NVR = (0x3fff) x 100; # vt102: 214e accum, 214f only lower 8 bit used, first 44 bytes
128 my $NVRADDR;
129 my $NVRDATA;
130 my $NVRLATCH;
131
132 my @NVRCMD = (
133 sub { $NVRDATA = ($NVRDATA << 1) + $_[1]; }, # 0 accept data
134 sub { $NVRADDR = ($NVRADDR << 1) + $_[1]; }, # 1 accept addr
135 sub { ($NVRDATA <<= 1) & 0x4000 }, # 2 shift out
136 undef, # 3 not used, will barf
137 sub { $NVR[$_[0]] = $NVRDATA & 0x3fff; }, # 4 write
138 sub { $NVR[$_[0]] = 0x3fff; }, # 5 erase
139 sub { $NVRDATA = $NVR[$_[0]]; }, # 6 read
140 sub { }, # 7 standby
141 );
142
143 my @NVR_BITIDX; $NVR_BITIDX[1 << $_] = 9 - $_ for 0..9;
144
145 # the nvr1400 state machine. what a monster
146 sub nvr() {
147 my $a1 = $NVR_BITIDX[(~$NVRADDR ) & 0x3ff];
148 my $a0 = $NVR_BITIDX[(~$NVRADDR >> 10) & 0x3ff];
149
150 $NVRCMD[($NVRLATCH >> 1) & 7]($a1 * 10 + $a0, $NVRLATCH & 1)
151 }
152
153 #############################################################################
154 # I/O ports - output
155
156 my $DC11_REVERSE = 0; # light background?
157
158 my $XON = 1; # false if terminal wants us to pause
159 my $PUSARTCMD;
160
161 my $KSTATUS; # keyboard status (click + scan flag + leds)
162 my @KXMIT; # current scan queue
163 my %KXMIT; # currently pressed keys
164 my @KQUEUE; # key event queue
165 my $KXCNT; # count for debouncew
166
167 my @PUSARTRECV; # serial input (to terminal) queue
168
169 sub out_00 { # pusartdata
170 # handle xon/xoff, but also pass it through
171 if ($_[0] == 0x13) {
172 $XON = 0;
173 return;#d#
174 } elsif ($_[0] == 0x11) {
175 $XON = 1;
176 return;#d#
177 }
178
179 syswrite $PTY, chr $_[0];
180
181 $INTPEND |= 1;
182 }
183
184 sub out_01 { # pusartcmd
185 $PUSARTCMD = shift;
186
187 $INTPEND |= 1 if $PUSARTCMD & 0x01; # VT102, 5.5 txrdy
188 $INTPEND |= 2 if $PUSARTCMD & 0x04 && !@PUSARTRECV; # VT102, 6.5 rxrdy, needed for some reason
189 }
190
191 sub out_02 { } # baudrate generator
192
193 sub out_23 { } # vt102 unknown
194 sub out_27 { } # vt102 unknown
195 sub out_2f { } # vt102 unknown, connected to in 0f
196
197 sub out_42 { } # brightness
198
199 sub out_62 { # nvr latch register (4 bits)
200 $NVRLATCH = shift;
201 }
202
203 sub out_a2 { # device control 011
204 my $dc11 = 0x0f & shift;
205
206 $DC11_REVERSE = 1 if $dc11 == 0b1010;
207 $DC11_REVERSE = 0 if $dc11 == 0b1011;
208 }
209
210 sub out_c2 { } # unknown
211 sub out_d2 { } # device control 012, 0..3 == 80c/132c/60hz/50hz
212
213 sub out_82 { # keyboard txmit
214 # CLICK STARTSCAN ONLINE LOCKED | L1 L2 L3 L4 (vt100)
215 # CLICK STARTSCAN ONLINE LOCKED | CTS DSR INS L1 (vt102)
216 $KSTATUS = $_[0];
217
218 # start new scan unless scan is in progress
219 if (($_[0] & 0x40) && !@KXMIT) {
220 # do not reply with keys in locked mode
221 # or during post (0xff),
222 # mostly to skip init and not fail POST,
223 # and to send startup keys only when terminal is ready
224 unless (($_[0] & 0x10) || ($_[0] == 0xff) || ($VT102 && $INTMASK == 0x07)) {
225 if ($KXCNT <= 0 && @KQUEUE) {
226 my $c = shift @KQUEUE;
227
228 if ($c < 0) { # key up
229 delete $KXMIT{-$c};
230 $KXCNT = 10;
231 } elsif ($c > 0) { # key down
232 undef $KXMIT{$c};
233 $KXCNT = 10;
234 } else { # delay
235 $KXCNT = 100;
236 }
237 }
238
239 --$KXCNT;
240 @KXMIT = sort keys %KXMIT;
241 }
242
243 $RST |= 1;
244 }
245 }
246
247 #############################################################################
248 # I/O ports - input
249
250 my $NVRBIT; # the current nvr data bit
251 my $LBA6; # twice the frequenxy of LBA7
252
253 sub in_00 { # pusart data
254 # interrupt not generated here, because infinite
255 # speed does not go well with the vt102.
256
257 shift @PUSARTRECV
258 }
259
260 sub in_01 { # pusart status
261 # DSR SYNDET FE OE | PE TXEMPTY RXRDY TXRDY
262 0x85 + (@PUSARTRECV && 0x02)
263 }
264
265 sub in_22 { # modem buffer
266 # wild guess: -CTS -SPDI -RI -CD 0 0 0 0
267 0x20
268 }
269
270 sub in_0f { 0xff } # vt102 unknown, connected to out 2f
271
272 sub in_42 { # flag buffer
273 ++$LBA6;
274
275 $NVRBIT = nvr ? 0x20 : 0x00 if ($LBA6 & 0x3) == 0x2;
276
277 # KBD_XMITEMPTY LBA7 NVRDATA ODDFIELD - OPTION !GFX !AVO PUSART_TXRDY
278
279 my $f = 0x85 | $NVRBIT;
280
281 $f |= 0x02 unless $AVO;
282 $f |= 0x40 if $LBA6 & 0x2;
283
284 $f
285 }
286
287 sub in_82 { # tbmt keyboard uart
288 return 0x7f unless @KXMIT;
289
290 $RST |= 1;
291 shift @KXMIT
292 }
293
294 sub in_03 { 0xff } # vt102 unknown, printer uart input?
295 sub in_0b { 0xff } # vt102 unknown
296 sub in_17 { 0xff } # vt102 unknown, printer status clear by reading?
297 sub in_1b { 0xff } # vt102 unknown
298
299 #############################################################################
300 # 8085 cpu opcodes and flag handling
301
302 my $x; # dummy scratchpad for opcodes
303
304 sub sf { # set flags, full version (ZSC - AP not implemented)
305 $FS = $_[0] & 0x080;
306 $FZ = !($_[0] & 0x0ff);
307 $FC = $_[0] & 0x100;
308
309 $_[0] &= 0xff;
310 }
311
312 sub sf8 { # set flags, for 8-bit results (ZSC - AP not implemented)
313 $FS = $_[0] & 0x080;
314 $FZ = !($_[0] & 0x0ff);
315 $FC = 0;
316 }
317
318 sub sf_nc { # set flags, except carry
319 $FS = $_[0] & 0x080;
320 $FZ = ($_[0] & 0x0ff) == 0;
321
322 $_[0] &= 0xff;
323 }
324
325 # opcode table
326 my @op = map { sprintf "status(); die 'unknown op %02x'", $_ } 0x00 .. 0xff;
327
328 my @reg = qw($B $C $D $E $H $L $M[$H*256+$L] $A); # r/m encoding
329 my @cc = ('!$FZ', '$FZ', '!$FC', '$FC', 'die;', 'die;', '!$FS', '$FS'); # cc encoding. die == unimplemented $FP parity
330
331 $op[0x00] = ''; # nop
332
333 # mov r,r / r,M / M,r
334 for my $s (0..7) {
335 for my $d (0..7) {
336 $op[0x40 + $d * 8 + $s] = "$reg[$d] = $reg[$s]"; # mov
337 }
338 }
339
340 $op[0x76] = 'die "HLT"'; # hlt (mov m,m)
341
342 # mvi r / M
343 $op[0x06 + $_ * 8] = "$reg[$_] = IMM8" for 0..7;
344
345 $op[0x01] = '($B, $C) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi
346 $op[0x11] = '($D, $E) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi
347 $op[0x21] = '($H, $L) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi
348 $op[0x31] = '$SP = IMM16' ; # lxi
349
350 $op[0x02] = '$M[$B * 256 + $C] = $A'; # stax
351 $op[0x12] = '$M[$D * 256 + $E] = $A'; # stax
352 $op[0x32] = '$M[IMM16 ] = $A'; # sta
353
354 $op[0x0a] = '$A = $M[$B * 256 + $C]'; # ldax b
355 $op[0x1a] = '$A = $M[$D * 256 + $E]'; # ldax d
356 $op[0x3a] = '$A = $M[IMM16]'; # lda
357
358 $op[0x22] = '($M[IMM16], $M[IMM16 + 1]) = ($L, $H)'; # shld
359 $op[0x2a] = '($L, $H) = ($M[IMM16], $M[IMM16 + 1])'; # lhld
360
361 sub inxdcx($$$) {
362 $x = $_[0] * 256 + $_[1] + $_[2];
363 ($_[0], $_[1]) = (($x >> 8) & 0xff, $x & 0xff);
364 }
365
366 $op[0x03] = 'inxdcx $B, $C, 1'; # inx
367 $op[0x13] = 'inxdcx $D, $E, 1'; # inx
368 $op[0x23] = 'inxdcx $H, $L, 1'; # inx
369 $op[0x33] = '$SP++' ; # inx
370 $op[0x0b] = 'inxdcx $B, $C, -1'; # dcx
371 $op[0x1b] = 'inxdcx $D, $E, -1'; # dcx
372 $op[0x2b] = 'inxdcx $H, $L, -1'; # dcx
373 $op[0x3b] = '--$SP' ; # dcx
374
375 # "no carry" doesn't seem to be needed for vt100 - optimize?
376 $op[0x04 + $_ * 8] = "sf_nc ++$reg[$_]" for 0..7; # inr
377 $op[0x05 + $_ * 8] = "sf_nc --$reg[$_]" for 0..7; # dcr
378
379 $op[0x07] = ' $FC = $A & 0x80; $A = (($A << 1) + ($FC && 0x01)) & 0xff '; # rlc
380 $op[0x17] = ' ($FC, $A) = ($A & 0x80, (($A << 1) + ($FC && 0x01)) & 0xff)'; # ral
381 $op[0x0f] = ' $FC = $A & 0x01; $A = ($A >> 1) | ($FC && 0x80) '; # rrc
382 $op[0x1f] = ' ($FC, $A) = ($A & 0x01, ($A >> 1) | ($FC && 0x80))'; # rar
383
384 # getting this insn wrong (its the only 16 bit insn to modify flags)
385 # wasted three of my best days with mindless vt102 rom reverse engineering
386 sub dad {
387 $x = $H * 256 + $L + $_[0];
388
389 ($H, $L) = (($x >> 8) & 0xff, $x & 0xff);
390 $FC = $x > 0xffff;
391 }
392
393 $op[0x09] = 'dad $B * 256 + $C'; # dad
394 $op[0x19] = 'dad $D * 256 + $E'; # dad
395 $op[0x29] = 'dad $H * 256 + $L'; # dad
396 $op[0x39] = 'dad $SP '; # dad
397
398 $op[0x2f] = '$A ^= 0xff'; # cma
399
400 $op[0x80 + $_] = 'sf $A += + ' . $reg[$_] for 0..7; # add
401 $op[0x88 + $_] = 'sf $A += ($FC && 1) + ' . $reg[$_] for 0..7; # adc
402 $op[0x90 + $_] = 'sf $A -= + ' . $reg[$_] for 0..7; # sub
403 $op[0x98 + $_] = 'sf $A -= ($FC && 1) + ' . $reg[$_] for 0..7; # sbb
404 $op[0xa0 + $_] = 'sf8 $A &= ' . $reg[$_] for 0..7; # ana
405 $op[0xa8 + $_] = 'sf8 $A ^= ' . $reg[$_] for 0..7; # xra
406 $op[0xb0 + $_] = 'sf8 $A |= ' . $reg[$_] for 0..7; # ora
407 $op[0xb8 + $_] = 'sf $x = $A - ' . $reg[$_] for 0..7; # cmp
408 # possible todo: optimize ora a, maybe xra a, possibly ana
409
410 $op[0xc6] = 'sf $A += IMM8'; # adi
411 $op[0xd6] = 'sf $A -= IMM8'; # sui
412 $op[0xe6] = 'sf8 $A &= IMM8'; # ani
413 $op[0xee] = 'sf8 $A ^= IMM8'; # xri
414 $op[0xf6] = 'sf8 $A |= IMM8'; # ori
415 $op[0xfe] = 'sf $A - IMM8'; # cpi
416 # ce ACI NYI, apparently unused
417 # de SBI NYI, apparently unused
418
419 $op[0xc5] = 'PUSH $B; PUSH $C';
420 $op[0xd5] = 'PUSH $D; PUSH $E';
421 $op[0xe5] = 'PUSH $H; PUSH $L';
422 $op[0xf5] = 'PUSH $A; PUSH +($FS && 0x80) | ($FZ && 0x40) | ($FA && 0x10) | ($FP && 0x04) | ($FC && 0x01)'; # psw
423
424 $op[0xc1] = '($C, $B) = (POP, POP)'; # pop
425 $op[0xd1] = '($E, $D) = (POP, POP)'; # pop
426 $op[0xe1] = '($L, $H) = (POP, POP)'; # pop
427 $op[0xf1] = '($x, $A) = (POP, POP); ($FS, $FZ, $FA, $FP, $FC) = ($x & 0x80, $x & 0x40, $x & 0x10, $x & 0x04, $x & 0x01)'; # pop psw
428
429 $op[0xc2 + $_ * 8] = 'BRA IMM16 if ' . $cc[$_] for 0..7; # jcc
430 $op[0xc3] = 'JMP IMM16'; # jmp
431
432 $op[0xc4 + $_ * 8] = '(PUSH PC >> 8), (PUSH PC & 0xff), (BRA IMM16) if ' . $cc[$_] for 0..7; # ccc
433 $op[0xcd] = '(PUSH PC >> 8), (PUSH PC & 0xff), (BRA IMM16)'; # call
434
435 $op[0xc0 + $_ * 8] = 'BRA POP + POP * 256 if ' . $cc[$_] for 0..7; # rcc
436 $op[0xc9] = 'JMP POP + POP * 256'; # ret
437
438 $op[0xc7 + $_ * 8] = "JMP $_ * 8" for 0..7; # rst
439
440 $op[0xe9] = 'JMP $H * 256 + $L'; # pchl
441 # f9 SPHL NYI, apparently unused
442
443 $op[0x37] = '$FC = 1 '; # stc
444 $op[0x3f] = '$FC = !$FC'; # cmc
445
446 $op[0xd3] = 'OUT'; # out
447 $op[0xdb] = 'IN'; # in
448
449 $op[0xeb] = '($D, $E, $H, $L) = ($H, $L, $D, $E)'; # xchg
450
451 # e3 xthl NYI # @ 917b in e69, hl <-> (sp)
452
453 $op[0x20] = '$A = $INTPEND * 16 + $INTMASK + ($IFF && 8)'; # rim (8085, incomplete)
454 $op[0x30] = '$INTMASK = $A & 7 if $A & 8'; # sim (8085, incomplete)
455
456 $op[0xf3] = '$IFF = 0'; # di
457 $op[0xfb] = '$IFF = 1'; # ei
458
459 # yeah, the fucking setup screen actually uses daa...
460 $op[0x27] = '
461 my ($h, $l);
462
463 ($h, $l) = ($A >> 4, $A & 15);
464
465 if ($l > 9 || $FA) {
466 sf $A += 6;
467 ($h, $l) = ($A >> 4, $A & 15);
468 }
469
470 if ($h > 9 || $FC) {
471 $h += 6;
472 $A = ($h * 16 + $l) & 0xff;
473 }
474 '; # daa, almost certainly borked, also, acarry not set by sf
475
476 #############################################################################
477 # debug
478
479 # print cpu status, for debugging
480 sub status {
481 my $PC = shift || $PC;
482
483 printf "%04x/%04x A=%02x BC=%02x:%02x DE=%02x:%02x HL=%02x:%02x ZSCAP=%s: %02x %s\n",
484 $PC, $SP,
485 $A, $B, $C, $D, $E, $H, $L,
486 ($FZ ? "1" : "0")
487 . ($FS ? "1" : "0")
488 . ($FC ? "1" : "0")
489 . ($FA ? "1" : "0")
490 . ($FP ? "1" : "0"),
491 $M[$PC], $op[$M[$PC]];
492 }
493
494 #############################################################################
495 # video emulation
496
497 binmode STDOUT;
498
499 my @CHARMAP = ( # acschars / chars 0..31
500 " " , "\x{29eb}", "\x{2592}", "\x{2409}",
501 "\x{240c}", "\x{240d}", "\x{240a}", "\x{00b0}",
502 "\x{00b1}", "\x{2424}", "\x{240b}", "\x{2518}",
503 "\x{2510}", "\x{250c}", "\x{2514}", "\x{253c}",
504 "\x{23ba}", "\x{23bb}", "\x{2500}", "\x{23bc}",
505 "\x{23bd}", "\x{251c}", "\x{2524}", "\x{2534}",
506 "\x{252c}", "\x{2502}", "\x{2264}", "\x{2265}",
507 "\x{03c0}", "\x{2260}", "\x{00a3}", "\x{00b7}",
508 (map chr, 0x020 .. 0x7e),
509 );
510
511 utf8::encode $_ for @CHARMAP;
512
513 my @SGR; # sgr sequences for attributes
514
515 for (0x00 .. 0xff) {
516 my $sgr = "";
517
518 # ~1 sgr 5 blink
519 # ~2 sgr 4 underline
520 # ~4 sgr 1 bold
521 # 0x80 in attr, sgr 7, reversed
522
523 $sgr .= ";5" unless $_ & 0x01;
524 $sgr .= ";4" unless $_ & 0x02;
525 $sgr .= ";1" unless $_ & 0x04;
526 $sgr .= ";7" if $_ & 0x80;
527
528 $SGR[$_] = "\e[${sgr}m";
529 }
530
531 my @LED = $VT102
532 ? qw(L1 INSERT DSR CTS LOCKED LOCAL SCAN BEEP)
533 : qw(L4 L3 L2 L1 LOCKED LOCAL SCAN BEEP);
534
535 my $CURSOR_IS_ON;
536
537 # display screen
538 sub display {
539 # this is for the powersave mode - check whether the cursor is on here,
540 # and only allow powersave later when it was on the last display time
541 $CURSOR_IS_ON = $M[$VT102 ? 0x207b : 0x21ba];
542
543 my $leds = join " ", map $KSTATUS & 2**$_ ? "\e[7m$LED[$_]\e[m" : "$LED[$_]", reverse 0 .. $#LED;
544
545 my $scr = sprintf "\e[H--- LED [ %s ] CLK %d\e[K\n", $leds, $CLK;
546
547 $scr .= "\e[?5" . ($DC11_REVERSE ? "h" : "l");
548
549 my $i = 0x2000;
550
551 line:
552 for my $y (0 .. 25) { # ntsc, two vblank delay lines, up to 24 text lines
553 my $prev_attr;
554 my ($c, $attr); # declare here for speedup
555
556 $scr .= sprintf "%2d \xe2\x94\x82", $y;
557
558 for (0..139) {
559 $c = $M[$i];
560
561 if ($c == 0x7f) { # also 0xff, but the firmware avoids that
562 $scr .= "\e[m\xe2\x94\x82\e[K\n";
563
564 my $a1 = $M[$i + 1];
565 my $a0 = $M[$i + 2];
566
567 $i = 0x2000 + (($a1 * 256 + $a0) & 0xfff);
568
569 next line;
570 }
571
572 $scr .= $SGR[$prev_attr = $attr]
573 if $prev_attr != ($attr = ($M[$i++ + 0x1000] & 15) | ($c & 0x80));
574
575 $scr .= $CHARMAP[$c & 0x7f];
576 }
577
578 $scr .= "\e[K\nvideo overflow\e[K\n";
579 last;
580 }
581
582 $scr .= "\e[m\e[J";
583
584 syswrite STDOUT, $scr;
585 }
586
587 #############################################################################
588 # keyboard handling
589
590 # 0x080 shift, 0x100 ctrl
591 my %KEYMAP = (
592 "\t" => 0x3a,
593 "\r" => 0x64,
594 "\n" => 0x44,
595
596 "\x00" => 0x77 | 0x100, # CTRL-SPACE
597 "\x1c" => 0x45 | 0x100, # CTRL-\
598 "\x1d" => 0x14 | 0x100, # CTRL-]
599 "\x1e" => 0x24 | 0x100, # CTRL-~
600 "\x1f" => 0x75 | 0x100, # CTRL-?
601
602 # hardcoded rxvt keys
603 "\e" => 0x2a, # ESC
604 "\e[2~" => 0x79 | 0x100, # CTRL-C (insert)
605 "\e[3~" => 0x03, # DC
606 "\e[5~" => 0x7e, # CAPS LOCK (prior)
607 "\e[6~" => 0x6a, # NO SCROLL (next)
608 "\e[A" => 0x30, # UP
609 "\e[B" => 0x22, # DOWN
610 "\e[C" => 0x10, # RIGHT
611 "\e[D" => 0x20, # LEFT
612 "\e[a" => 0x30 | 0x080, # UP
613 "\e[b" => 0x22 | 0x080, # DOWN
614 "\e[c" => 0x10 | 0x080, # RIGHT
615 "\e[d" => 0x20 | 0x080, # LEFT
616 "\e[7~" => 0x7b, # SETUP (home)
617 "\e[8~" => 0x23, # BREAK (end)
618 "\e[8\$" => 0x23 | 0x080, # SHIFT BREAK / DISCONNECT (shift-end)
619 "\x7f" => 0x33, # BACKSPACE
620
621 "\e[11~" => 0x32, # PF1
622 "\e[12~" => 0x42, # PF2
623 "\e[13~" => 0x31, # PF3
624 "\e[14~" => 0x41, # PF4
625 );
626
627 @KEYMAP{map chr, 0x20 .. 0x40, 0x5b .. 0x7e} = unpack "C*", pack "H*",
628 "779ad5a9a8b8a755a6b5b6b466256575" . "351a3929283837273626d656e634e5f5" . "b9" # 20..40
629 . "154514b7a5" . "244a6879591949485816574746766706" . "050a185a0817780969077a95c594a4"; # 5b..7e
630
631 $KEYMAP{"\x1f" & $_} ||= $KEYMAP{$_} | 0x100 for "a" .. "z"; # ctrl
632 $KEYMAP{"\x20" ^ $_} ||= $KEYMAP{$_} | 0x080 for "a" .. "z"; # shift
633
634 my $KEYMATCH = join "|", map quotemeta, reverse sort keys %KEYMAP;
635 $KEYMATCH = qr{^($KEYMATCH)}s;
636
637 my %KMOD; # currently pressed modifier keys
638
639 sub key {
640 my ($key) = @_;
641
642 push @KQUEUE, -0x7c if !($key & 0x100) && delete $KMOD{0x7c}; # ctrl-up
643 push @KQUEUE, -0x7d if !($key & 0x080) && delete $KMOD{0x7d}; # shift-up
644
645 push @KQUEUE, 0x7c if $key & 0x100 && !$KMOD{0x7c}++; # ctrl-down
646 push @KQUEUE, 0x7d if $key & 0x080 && !$KMOD{0x7d}++; # shift-down
647
648 $key &= 0x7f;
649 push @KQUEUE, $key, -$key;
650 }
651
652 my $STDIN_BUF;
653
654 sub stdin_parse {
655 key $KEYMAP{$1}
656 while $STDIN_BUF =~ s/$KEYMATCH//;
657
658 # skip input we can't decipher
659 substr $STDIN_BUF, 0, 1, "";
660 }
661
662 if ($KBD) {
663 system "stty -icanon -icrnl -inlcr -echo min 1 time 0"; # -isig
664 eval q{ sub END { system "stty sane" } };
665 $SIG{INT} = $SIG{TERM} = $SIG{QUIT} = sub { exit 1 };
666 }
667
668 #############################################################################
669 # initial key input, to set up online mode etc.
670 # could be done via nvram defaults
671
672 @KQUEUE = (
673 0x7b, -0x7b, # setup
674 0, # delay
675 0x28, -0x28, # 4, toggle local/online
676 0x38, -0x38, # 5, setup b
677 0, # delay
678 (0x10, -0x10) x 2, # cursor right
679 0x37, -0x37, # 6 toggle soft scroll
680 (0x10, -0x10) x 1, # cursor right
681 0x37, -0x37, # 6 toggle autorepeat off
682 (0x10, -0x10) x 8, # cursor right
683 0x37, -0x37, # 6 toggle keyclick
684 (0x10, -0x10) x 1, # cursor right
685 $VT102 ? () : (0x37, -0x37), # 6 toggle ansi/vt52
686 (0x10, -0x10) x 7, # cursor right
687 0x37, -0x37, # 6 toggle wrap around
688 0x7b, -0x7b, # leave setup
689 );
690
691 #############################################################################
692 # process/pty management
693
694 if (1) {
695 require IO::Pty;
696 $PTY = IO::Pty->new;
697
698 my $slave = $PTY->slave;
699
700 $PTY->set_winsize (24, 80);
701
702 unless (fork) {
703 $ENV{LC_ALL} = "C";
704 $ENV{TERM} = $VT102 ? "vt102" : "vt100";
705
706 close $PTY;
707
708 open STDIN , "<&", $slave;
709 open STDOUT, ">&", $slave;
710 open STDERR, ">&", $slave;
711
712 system "stty ixoff erase ^H";
713
714 $PTY->make_slave_controlling_terminal;
715 $PTY->close_slave;
716
717 @ARGV = "sh" unless @ARGV;
718 exec @ARGV;
719 }
720
721 $PTY->close_slave;
722 } else {
723 open $PTY, "+</dev/null"
724 or die "/dev/null: $!";
725 }
726
727 #############################################################################
728 # the actual hardware simulator
729
730 my @ICACHE; # compiled instruction/basic block cache
731
732 my $POWERSAVE; # powersave counter
733
734 my $RIN; # libev for the less well-off
735
736 (vec $RIN, 0, 1) = 1 if $KBD;
737 (vec $RIN, fileno $PTY, 1) = 1 if $PTY;
738
739 # the cpu.
740 while () {
741 # execute an extended basic block
742 $PC = ($ICACHE[$PC] ||= do {
743 my $pc = $PC;
744
745 my $insn = "";
746
747 # the jit compiler
748 for (0..31) {
749 my $imm;
750 my $op = $op[$M[$pc++]];
751
752 for ($op) {
753 s/\bPUSH\b/\$M[--\$SP] =/g; # push byte to stack
754 s/\bPOP\b/\$M[\$SP++]/g; # pop byte from stack
755
756 s/\bIMM16\b/$imm \/\/= $M[$pc++] + $M[$pc++] * 256/xge; # 16 bit insn immediate
757 s/\bIMM8\b /$imm \/\/= $M[$pc++] /xge; # 8 bit insn immediate
758
759 s/\bPC\b/$pc/ge; # PC at end of insn
760 s/\bBRA\b/return/g; # conditional jump
761 s/\bJMP\b(.*)/$1\x00/sg; # unconditional jump
762
763 s/\bIN\b/ sprintf "\$A = in_%02x", $M[$pc++]/xge; # in insns call in_HEX
764 s/\bOUT\b/sprintf "out_%02x \$A ", $M[$pc++]/xge; # out likewise
765 }
766
767 $insn .= "$op;\n";
768 }
769
770 $insn .= $pc;
771 $insn =~ s/\x00.*$//s;
772
773 eval "sub { $insn }" or die "$insn: $@"
774 })->();
775
776 ++$CLK;
777
778 # things we do from time to time only
779 unless ($CLK & 0xf) {
780 # do I/O
781
782 unless ($CLK & 0xfff) {
783 if (select $x = $RIN, undef, undef, $POWERSAVE < 10 ? 0 : $CURSOR_IS_ON && 3600) {
784
785 # pty/serial I/O
786 if ($PTY && (vec $x, fileno $PTY, 1) && (@PUSARTRECV < 128) && !@KQUEUE) {
787 sysread $PTY, my $buf, 256;
788
789 # linux don't do cs7 and/or parity anymore, so we need to filter
790 # out xoff characters to avoid freezes.
791 push @PUSARTRECV, grep { ($_ & 0x7f) != 0x13 } unpack "C*", $buf;
792 }
793
794 # keyboard input
795 if ($KBD && (vec $x, 0, 1)) {
796 # to avoid non-blocking mode on stdin (and stty min 0), we
797 # just read byte-by-byte after a select says there is data.
798 while (select my $rin = "\x01", undef, undef, 0) {
799 sysread STDIN, $STDIN_BUF, 1, length $STDIN_BUF
800 or last;
801 }
802
803 stdin_parse if length $STDIN_BUF;
804 }
805
806 $POWERSAVE = 0; # activity
807 } elsif (@PUSARTRECV || @KQUEUE) {
808 $POWERSAVE = 0;
809 } else {
810 ++$POWERSAVE;
811 }
812 }
813
814 # kick off serial input interrupt quite often
815 $RST |= 2 if @PUSARTRECV && $XON; # VT100, but works on vt102, too (probably not used on real hardware though)
816 #$INTPEND |= 2 if @PUSARTRECV && $XON; # VT102, 6.5 rxrdy
817
818 # kick off vertical retrace interrupt from time to time
819 unless ($CLK & 0x1ff) {
820 $RST |= 4; # vertical retrace
821 }
822
823 # handle video hardware
824 unless ($CLK & 0x3fff) {
825 display;
826 }
827 }
828
829 # the interrupt logic - we only interrupt after basic blocks
830 # which, as a side effect, ensures that we don't interrupt
831 # "ei; ret" sequences and thus reduce the risk of stack overflows.
832 if (($RST || ($INTPEND & ~$INTMASK)) && $IFF) {
833 # rst 1 kbd data available
834 # rst 2 pusart xmit+recv flag
835 # rst 4 vertical retrace
836 # 5.5 vt125 mb7 trans ready (serial send?)
837 # 6.5 vt125 mb7 read ready (something modem?)
838 # 7.5 vt125 mb7 vblank h(?)
839 # trap vt125 mbi init h(?)
840 my $vec;
841
842 my $pend = $INTPEND & ~$INTMASK;
843
844 if ($pend & 1) { $vec = 0x2c; $INTPEND &= ~1;
845 } elsif ($pend & 2) { $vec = 0x34; $INTPEND &= ~2;
846 } elsif ($pend & 4) { $vec = 0x3c; $INTPEND &= ~4;
847 # } elsif ($RST ) { $vec = $RST * 8; $RST = 0; # the vt102 firmware doesn't like combined interrupts
848 } elsif ($RST & 1) { $vec = 0x08; $RST &= ~1; # separate is better for vt102
849 } elsif ($RST & 2) { $vec = 0x10; $RST &= ~2;
850 } elsif ($RST & 4) { $vec = 0x20; $RST &= ~4;
851 } else {
852 die;
853 }
854
855 # jump to the interrupt vector
856 $M[--$SP] = $PC >> 8;
857 $M[--$SP] = $PC & 0xff;
858 $PC = $vec;
859
860 $IFF = 0;
861 }
862 }
863
864 #############################################################################
865 # roms in the data section + one newline
866 #
867 # vt100 @ 0x0000+0x0800 23-032E2
868 # vt100 @ 0x0800+0x0800 23-061E2
869 # vt100 @ 0x1000+0x0800 23-033E2
870 # vt100 @ 0x1800+0x0800 23-034E2
871 #
872 # vt102 @ 0x0000+0x2000 23-226E4
873 # vt102 @ 0x8000+0x2000 23-225E4
874 #
875 # vt131 @ 0xa000+0x0800 23-280E2
876 #
877
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