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Revision: 1.15
Committed: Wed Dec 3 02:14:56 2014 UTC (9 years, 5 months ago) by root
Branch: MAIN
Changes since 1.14: +7 -7 lines
Log Message:
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File Contents

# User Rev Content
1 root 1.1 #!/opt/bin/perl
2    
3 root 1.2 #
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 root 1.9 use strict;
21     #use common::sense;
22 root 1.1
23 root 1.3 my $VT102 = 1;
24 root 1.10 my $VT131 = 0;
25     my $AVO = 1;
26 root 1.1
27 root 1.13 shift, ($VT102 = 0), ($AVO = 0) if $ARGV[0] =~ /^-?-vt100$/;
28     shift, ($VT102 = 0) if $ARGV[0] =~ /^-?-vt100\+avo$/;
29     shift if $ARGV[0] =~ /^-?-vt102$/;
30     shift, ($VT131 = 1) if $ARGV[0] =~ /^-?-vt131$/;
31 root 1.10
32     if ($ARGV[0] =~ /^-/) {
33     die <<EOF;
34    
35     VT102, A VT100/101/102/131 SIMULATOR
36    
37     Usage:
38    
39     $0 [option] [program [args]]
40    
41     Examples:
42    
43     $0 bash
44     $0 telnet towel.blinkenlights.nl
45     $0 curl http://artscene.textfiles.com/vt100/trekvid.vt
46     $0 curl http://artscene.textfiles.com/vt100/surf.vt # in 3d!
47    
48     Option can be one of:
49    
50     --vt100
51     --vt100+avo
52     --vt102
53     --vt131
54    
55     Non-obvious special keys are:
56    
57     SET UP Home
58     BACKSPACE Rubout
59     CAPS LOCK Prior/PgUp
60     NO SCROLL Next/PgDown
61     BREAK End
62    
63     Set-Up Guide:
64    
65     http://vt100.net/docs/vt102-ug/chapter3.html#S3.6
66    
67     Author:
68    
69     Marc Lehmann <vt102\@schmorp.de>
70    
71     EOF
72     }
73    
74 root 1.1 #############################################################################
75 root 1.10 # ROM/hardware init
76 root 1.1
77 root 1.15 my $PTY; # the pty we allocated, if any
78     my $KBD = 1;
79    
80 root 1.10 my $ROMS = do {
81 root 1.1 binmode DATA;
82     local $/;
83     <DATA>
84     };
85    
86 root 1.10 0x6801 == length $ROMS or die "corrupted rom image";
87 root 1.1
88     my @M = (0xff) x 65536; # main memory, = (0xff) x 65536;
89    
90     # populate mem with rom contents
91     if ($VT102) {
92 root 1.10 @M[0x0000 .. 0x1fff] = unpack "C*", substr $ROMS, 0x2000, 0x2000;
93     @M[0x8000 .. 0x9fff] = unpack "C*", substr $ROMS, 0x4000, 0x2000;
94     @M[0xa000 .. 0xa7ff] = unpack "C*", substr $ROMS, 0x6000, 0x0800 if $VT131;
95 root 1.1 } else {
96 root 1.10 @M[0x0000 .. 0x1fff] = unpack "C*", substr $ROMS, 0x0000, 0x2000;
97 root 1.1 }
98    
99     #############################################################################
100 root 1.10 # 8085 CPU registers and I/O support
101 root 1.1
102     # 8080/8085 registers
103     # b, c, d, e, h, l, a
104     my ($A, $B, $C, $D, $E, $H, $L, $A);
105     my ($PC, $SP, $IFF, $FA, $FZ, $FS, $FP, $FC);
106    
107     my $RST = 0; # 8080 pending interrupts
108     my $INTMASK = 7; # 8085 half interrupts
109     my $INTPEND = 0; # 8085 half interrupts
110    
111     my $x; # dummy temp for instructions
112    
113     my $CLK; # rather inexact clock
114    
115     #############################################################################
116 root 1.10 # the dreaded NVR1400 chip. not needed to get it going, but provided anyway
117 root 1.1
118     # nvram
119     my @NVR = (0x3fff) x 100; # vt102: 214e accum, 214f only lower 8 bit used, first 44 bytes
120     my $NVRADDR;
121     my $NVRDATA;
122     my $NVRLATCH;
123    
124     my @NVRCMD = (
125 root 1.5 sub { $NVRDATA = ($NVRDATA << 1) + $_[1]; }, # 0 accept data
126     sub { $NVRADDR = ($NVRADDR << 1) + $_[1]; }, # 1 accept addr
127     sub { ($NVRDATA <<= 1) & 0x4000 }, # 2 shift out
128     undef, # 3 not used, will barf
129     sub { $NVR[$_[0]] = $NVRDATA & 0x3fff; }, # 4 write
130     sub { $NVR[$_[0]] = 0x3fff; }, # 5 erase
131     sub { $NVRDATA = $NVR[$_[0]]; }, # 6 read
132     sub { }, # 7 standby
133 root 1.1 );
134    
135 root 1.15 my @NVR_BITIDX;
136     $NVR_BITIDX[1 << $_] = 9 - $_ for 0..9;
137 root 1.1
138     # the nvr1400 state machine. what a monster
139     sub nvr() {
140 root 1.15 my $a1 = $NVR_BITIDX[(~$NVRADDR ) & 0x3ff];
141     my $a0 = $NVR_BITIDX[(~$NVRADDR >> 10) & 0x3ff];
142 root 1.1
143     # printf "NVR %02x A %020b %d %d D %02x\n", $NVRLATCH, $NVRADDR & 0xfffff, $a1, $a0, $NVRDATA;
144    
145     $NVRCMD[($NVRLATCH >> 1) & 7]($a1 * 10 + $a0, $NVRLATCH & 1)
146     }
147    
148     #############################################################################
149 root 1.10 # I/O ports - output
150 root 1.1
151 root 1.6 my $DC11_REVERSE = 0;
152 root 1.1
153     my $XON = 1; # false if terminal wants us to pause
154     my $PUSARTCMD;
155    
156     my @KXMIT; # current scan queue
157     my %KXMIT; # currently pressed keys
158     my @KQUEUE; # key event queue
159     my $KXCNT; # count for debouncew
160     my @PUSARTRECV;
161     my $KSTATUS;
162    
163     sub out_00 { # pusartdata
164     # handle xon/xoff, but also pass it through
165     if ($_[0] == 0x13) {
166     $XON = 0;
167 root 1.3 return;#d#
168 root 1.1 } elsif ($_[0] == 0x11) {
169     $XON = 1;
170 root 1.3 return;#d#
171 root 1.1 }
172    
173     syswrite $PTY, chr $_[0];
174    
175 root 1.3 $INTPEND |= 1;
176 root 1.1 }
177    
178     sub out_01 {
179     $PUSARTCMD = shift;
180    
181     $INTPEND |= 1 if $PUSARTCMD & 0x01; # VT102, 5.5 txrdy
182 root 1.3 $INTPEND |= 2 if $PUSARTCMD & 0x04 && !@PUSARTRECV; # VT102, 6.5 rxrdy, needed for some reason
183 root 1.1 }
184    
185     sub out_02 { } # baudrate generator
186    
187     sub out_23 { } # unknown
188     sub out_27 { } # unknown
189     sub out_2f { } # unknown, connected to in 0f
190    
191     sub out_42 { } # brightness
192    
193     sub out_62 {
194     $NVRLATCH = shift;
195     }
196    
197 root 1.6 sub out_a2 {
198     my $dc11 = 0x0f & shift;
199    
200     $DC11_REVERSE = 1 if $dc11 == 0b1010;
201     $DC11_REVERSE = 0 if $dc11 == 0b1011;
202     }
203    
204 root 1.1 sub out_c2 { } # unknown
205 root 1.6 sub out_d2 { } # 0..3 == 80c/132c/60hz/50hz
206 root 1.1
207     sub out_82 {
208     # keyboard
209    
210 root 1.10 # CLICK STARTSCAN ONLINE LOCKED | CTS DSR INS L1
211     # CLICK STARTSCAN ONLINE LOCKED | L1 L2 L3 L4
212 root 1.1 $KSTATUS = $_[0];
213    
214     # start new scan unless scan in progress
215     if (($_[0] & 0x40) && !@KXMIT) {
216     # do not reply with keys in locked mode
217     # or during post (0xff),
218     # mostly to skip init and not fail POST,
219     # and to send startup keys only when terminal is ready
220     unless (($_[0] & 0x10) || ($_[0] == 0xff) || ($VT102 && $INTMASK == 0x07)) {
221     if ($KXCNT <= 0 && @KQUEUE) {
222     my $c = shift @KQUEUE;
223    
224     if ($c < 0) { # key up
225     delete $KXMIT{-$c};
226     $KXCNT = 10;
227     } elsif ($c > 0) { # key down
228     undef $KXMIT{$c};
229     $KXCNT = 10;
230     } else { # delay
231     $KXCNT = 100;
232     }
233     }
234    
235     --$KXCNT;
236     @KXMIT = sort keys %KXMIT;
237     }
238    
239     $RST |= 1;
240     }
241     }
242    
243     #############################################################################
244 root 1.10 # I/O ports - input
245 root 1.1
246     my $NVRBIT;
247 root 1.10 my $LBA6; # twice the frequenxy of LBA7
248 root 1.1
249     sub in_00 { # pusart data
250 root 1.3 # interrupt not generated here, because infinite
251     # speed does not go well with the vt102.
252 root 1.1
253     shift @PUSARTRECV
254     }
255    
256     sub in_01 { # pusart status
257     # DSR SYNDET FE OE | PE TXEMPTY RXRDY TXRDY
258     0x85 + (@PUSARTRECV && 0x02)
259     }
260    
261     sub in_22 { # modem buffer(?)
262     # wild guess: -CTS -SPDI -RI -CD 0 0 0 0
263     0x20
264     }
265    
266 root 1.10 sub in_0f { 0xff } # vt102 unknown, connected to out 2f
267 root 1.1
268     sub in_42 { # flag buffer
269 root 1.10 ++$LBA6;
270 root 1.1
271 root 1.10 $NVRBIT = nvr ? 0x20 : 0x00 if ($LBA6 & 0x3) == 0x2;
272 root 1.1
273     # KBD_XMITEMPTY LBA7 NVRDATA ODDFIELD - OPTION !GFX !AVO PUSART_TXRDY
274    
275     my $f = 0x85 | $NVRBIT;
276    
277     $f |= 0x02 unless $AVO;
278 root 1.10 $f |= 0x40 if $LBA6 & 0x2;
279 root 1.1
280     $f
281     }
282    
283     sub in_82 { # tbmt keyboard uart
284     return 0x7f unless @KXMIT;
285    
286     $RST |= 1;
287     shift @KXMIT
288     }
289    
290 root 1.10 sub in_03 { 0xff } # vt102 unknown, printer uart input?
291     sub in_0b { 0xff } # vt102 unknown
292     sub in_17 { 0xff } # vt102 unknown, printer status clear by reading?
293     sub in_1b { 0xff } # vt102 unknown
294 root 1.1
295     #############################################################################
296 root 1.10 # 8085 cpu opcodes and flag handling
297 root 1.1
298 root 1.3 sub sf { # set flags (ZSC - AP not implemented)
299 root 1.10 $FS = $_[0] & 0x080;
300     $FZ = !($_[0] & 0x0ff);
301     $FC = $_[0] & 0x100;
302    
303     $_[0] &= 0xff;
304     }
305 root 1.1
306 root 1.10 sub sf8 { # set flags (ZSC - AP not implemented)
307     $FS = $_[0] & 0x080;
308     $FZ = !($_[0] & 0x0ff);
309     $FC = 0;
310 root 1.1 }
311    
312 root 1.3 sub sf_nc { # set flags except carry
313 root 1.1 $FS = $_[0] & 0x080;
314     $FZ = ($_[0] & 0x0ff) == 0;
315    
316 root 1.10 $_[0] &= 0xff;
317 root 1.1 }
318    
319 root 1.10 my @op = map { sprintf "status(); die 'unknown op %02x'", $_ } 0x00 .. 0xff;
320 root 1.1
321     my @reg = qw($B $C $D $E $H $L $M[$H*256+$L] $A);
322     my @cc = ('if !$FZ', 'if $FZ', 'if !$FC', 'if $FC', ';die', ';die', 'if !$FS', 'if $FS'); # die == unimplemented $FP parity
323    
324 root 1.10 $op[0x00] = '';
325    
326 root 1.1 # mov r,r / r,M / M,r
327     for my $s (0..7) {
328     for my $d (0..7) {
329 root 1.10 $op[0x40 + $d * 8 + $s] = "$reg[$d] = $reg[$s]"; # mov
330 root 1.1 }
331     }
332    
333 root 1.10 $op[0x76] = 'die "HLT"'; # hlt (mov m,m)
334    
335     # mvi r / M
336     $op[0x06 + $_ * 8] = "$reg[$_] = IMM8" for 0..7;
337 root 1.1
338     $op[0x01] = '($B, $C) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi
339     $op[0x11] = '($D, $E) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi
340     $op[0x21] = '($H, $L) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi
341 root 1.10 $op[0x31] = '$SP = IMM16' ; # lxi
342 root 1.1
343     $op[0x02] = '$M[$B * 256 + $C] = $A'; # stax
344     $op[0x12] = '$M[$D * 256 + $E] = $A'; # stax
345     $op[0x32] = '$M[IMM16 ] = $A'; # sta
346    
347 root 1.10 $op[0x0a] = '$A = $M[$B * 256 + $C]'; # ldax b
348     $op[0x1a] = '$A = $M[$D * 256 + $E]'; # ldax d
349     $op[0x3a] = '$A = $M[IMM16]'; # lda
350    
351     $op[0x22] = '($M[IMM16], $M[IMM16 + 1]) = ($L, $H)'; # shld
352     $op[0x2a] = '($L, $H) = ($M[IMM16], $M[IMM16 + 1])'; # lhld
353    
354 root 1.1 sub inxdcx($$$) {
355 root 1.10 $x = $_[0] * 256 + $_[1] + $_[2];
356     ($_[0], $_[1]) = (($x >> 8) & 0xff, $x & 0xff);
357 root 1.1 }
358    
359     $op[0x03] = 'inxdcx $B, $C, 1'; # inx
360     $op[0x13] = 'inxdcx $D, $E, 1'; # inx
361     $op[0x23] = 'inxdcx $H, $L, 1'; # inx
362     $op[0x33] = '$SP++' ; # inx
363     $op[0x0b] = 'inxdcx $B, $C, -1'; # dcx
364     $op[0x1b] = 'inxdcx $D, $E, -1'; # dcx
365     $op[0x2b] = 'inxdcx $H, $L, -1'; # dcx
366     $op[0x3b] = '--$SP' ; # dcx
367    
368     # "no carry" doesn't seem to be needed for vt100 - optimize?
369 root 1.10 $op[0x04 + $_ * 8] = "sf_nc ++$reg[$_]" for 0..7; # inr
370     $op[0x05 + $_ * 8] = "sf_nc --$reg[$_]" for 0..7; # dcr
371    
372     $op[0x07] = ' $FC = $A & 0x80; $A = (($A << 1) + ($FC && 0x01)) & 0xff '; # rlc
373     $op[0x17] = ' ($FC, $A) = ($A & 0x80, (($A << 1) + ($FC && 0x01)) & 0xff)'; # ral
374    
375     $op[0x0f] = ' $FC = $A & 0x01; $A = ($A >> 1) | ($FC && 0x80) '; # rrc
376     $op[0x1f] = ' ($FC, $A) = ($A & 0x01, ($A >> 1) | ($FC && 0x80))'; # rar
377 root 1.1
378 root 1.10 $op[0x2f] = '$A ^= 0xff'; # cma
379 root 1.1
380     # getting this insn wrong (its the only 16 bit insn to modify flags)
381     # wasted three of my best days with mindless vt102 rom reverse engineering
382     sub dad {
383     $x = $H * 256 + $L + $_[0];
384    
385     ($H, $L) = (($x >> 8) & 0xff, $x & 0xff);
386     $FC = $x > 0xffff;
387     }
388    
389     $op[0x09] = 'dad $B * 256 + $C'; # dad
390     $op[0x19] = 'dad $D * 256 + $E'; # dad
391     $op[0x29] = 'dad $H * 256 + $L'; # dad
392     $op[0x39] = 'dad $SP '; # dad
393    
394 root 1.10 $op[0x80 + $_] = 'sf $A += + ' . $reg[$_] for 0..7; # add
395     $op[0x88 + $_] = 'sf $A += ($FC && 1) + ' . $reg[$_] for 0..7; # adc
396     $op[0x90 + $_] = 'sf $A -= + ' . $reg[$_] for 0..7; # sub
397     $op[0x98 + $_] = 'sf $A -= ($FC && 1) + ' . $reg[$_] for 0..7; # sbb
398     $op[0xa0 + $_] = 'sf8 $A &= ' . $reg[$_] for 0..7; # ana
399     $op[0xa8 + $_] = 'sf8 $A ^= ' . $reg[$_] for 0..7; # xra
400     $op[0xb0 + $_] = 'sf8 $A |= ' . $reg[$_] for 0..7; # ora
401     $op[0xb8 + $_] = 'sf $x = $A - ' . $reg[$_] for 0..7; # cmp
402     # possible todo: optimize ora a, maybe xra a
403 root 1.1
404 root 1.10 $op[0xc6] = 'sf $A += IMM8'; # adi
405     # ce ADI NYI
406     $op[0xd6] = 'sf $A -= IMM8'; # sui
407     # de SBI NYI
408     $op[0xe6] = 'sf8 $A &= IMM8'; # ani
409     $op[0xee] = 'sf8 $A ^= IMM8'; # xri
410     $op[0xf6] = 'sf8 $A |= IMM8'; # ori
411     $op[0xfe] = 'sf $A - IMM8'; # cpi
412 root 1.1
413 root 1.10 $op[0xc5] = 'PUSH $B; PUSH $C';
414     $op[0xd5] = 'PUSH $D; PUSH $E';
415     $op[0xe5] = 'PUSH $H; PUSH $L';
416     $op[0xf5] = 'PUSH $A; PUSH +($FS && 0x80) | ($FZ && 0x40) | ($FA && 0x10) | ($FP && 0x04) | ($FC && 0x01)'; # psw
417 root 1.1
418     $op[0xc1] = '($C, $B) = (POP, POP)'; # pop
419     $op[0xd1] = '($E, $D) = (POP, POP)'; # pop
420     $op[0xe1] = '($L, $H) = (POP, POP)'; # pop
421 root 1.10 $op[0xf1] = '($x, $A) = (POP, POP); ($FS, $FZ, $FA, $FP, $FC) = ($x & 0x80, $x & 0x40, $x & 0x10, $x & 0x04, $x & 0x01)'; # pop psw
422 root 1.1
423     $op[0xc2 + $_ * 8] = 'BRA IMM16 ' . $cc[$_] for 0..7; # jcc
424     $op[0xc3] = 'JMP IMM16'; # jmp
425    
426     $op[0xc4 + $_ * 8] = '(PUSH PC >> 8), (PUSH PC & 0xff), (BRA IMM16) ' . $cc[$_] for 0..7; # ccc
427     $op[0xcd] = '(PUSH PC >> 8), (PUSH PC & 0xff), (BRA IMM16)'; # call
428    
429 root 1.10 $op[0xc0 + $_ * 8] = 'BRA POP + POP * 256 ' . $cc[$_] for 0..7; # rcc
430     $op[0xc9] = 'JMP POP + POP * 256'; # ret
431    
432 root 1.1 $op[0xc7 + $_ * 8] = "JMP $_ * 8" for 0..7; # rst
433    
434 root 1.10 $op[0xe9] = 'JMP $H * 256 + $L'; # pchl
435     # f9 SPHL NYI
436 root 1.1
437 root 1.10 $op[0x37] = '$FC = 1 '; # stc
438     $op[0x3f] = '$FC = !$FC'; # cmc
439 root 1.1
440     $op[0xd3] = 'OUT'; # out
441     $op[0xdb] = 'IN'; # in
442    
443 root 1.10 $op[0xeb] = '($D, $E, $H, $L) = ($H, $L, $D, $E)'; # xchg
444    
445     # e3 xthl NYI # @ 917b, hl <-> (sp)
446 root 1.1
447 root 1.10 $op[0x20] = '$A = $INTPEND * 16 + $INTMASK + ($IFF && 8)'; # rim (incomplete)
448     $op[0x30] = '$INTMASK = $A & 7 if $A & 8'; # sim (incomplete)
449 root 1.1
450     $op[0xf3] = '$IFF = 0'; # DI
451     $op[0xfb] = '$IFF = 1'; # EI
452    
453 root 1.10 # yeah, the fucking setup screens actually use daa...
454     $op[0x27] = '
455     my ($h, $l);
456    
457     ($h, $l) = ($A >> 4, $A & 15);
458    
459     if ($l > 9 || $FA) {
460     sf $A += 6;
461     ($h, $l) = ($A >> 4, $A & 15);
462     }
463    
464     if ($h > 9 || $FC) {
465     $h += 6;
466     $A = ($h * 16 + $l) & 0xff;
467     }
468     '; # daa, almost certainly borked, also, acarry not set by sf
469 root 1.1
470     #############################################################################
471 root 1.10 # print cpu status for debugging purposes
472 root 1.1
473     # print cpu status, for debugging
474     sub status {
475     my $PC = shift || $PC;
476    
477     printf "%04x/%04x A=%02x BC=%02x:%02x DE=%02x:%02x HL=%02x:%02x ZSCAP=%s: %02x %s\n",
478     $PC, $SP,
479     $A, $B, $C, $D, $E, $H, $L,
480     ($FZ ? "1" : "0")
481     . ($FS ? "1" : "0")
482     . ($FC ? "1" : "0")
483     . ($FA ? "1" : "0")
484     . ($FP ? "1" : "0"),
485 root 1.10 $M[$PC], $op[$M[$PC]];
486 root 1.1 }
487    
488     #############################################################################
489 root 1.10 # video emulation
490 root 1.1
491 root 1.14 binmode STDOUT;
492    
493 root 1.10 my @CHARMAP = (
494 root 1.5 " " , "\x{29eb}", "\x{2592}", "\x{2409}",
495     "\x{240c}", "\x{240d}", "\x{240a}", "\x{00b0}",
496     "\x{00b1}", "\x{2424}", "\x{240b}", "\x{2518}",
497     "\x{2510}", "\x{250c}", "\x{2514}", "\x{253c}",
498     "\x{23ba}", "\x{23bb}", "\x{2500}", "\x{23bc}",
499     "\x{23bd}", "\x{251c}", "\x{2524}", "\x{2534}",
500     "\x{252c}", "\x{2502}", "\x{2264}", "\x{2265}",
501     "\x{03c0}", "\x{2260}", "\x{00a3}", "\x{00b7}",
502 root 1.1 (map chr, 0x020 .. 0x7e),
503     );
504    
505 root 1.10 utf8::encode $_ for @CHARMAP;
506 root 1.1
507 root 1.10 my @SGR; # sgr sequences for attributes
508 root 1.6
509     for (0x00 .. 0xff) {
510     my $sgr = "";
511    
512 root 1.10 # ~1 sgr 5 blink
513     # ~2 sgr 4 underline
514     # ~4 sgr 1 bold
515     # 0x80 in attr, sgr 7, reversed
516    
517 root 1.6 $sgr .= ";5" unless $_ & 0x01;
518     $sgr .= ";4" unless $_ & 0x02;
519     $sgr .= ";1" unless $_ & 0x04;
520     $sgr .= ";7" if $_ & 0x80;
521    
522 root 1.10 $SGR[$_] = "\e[${sgr}m";
523 root 1.6 }
524    
525 root 1.10 my @LED = $VT102
526     ? qw(L1 INSERT DSR CTS LOCKED LOCAL SCAN BEEP)
527     : qw(L4 L3 L2 L1 LOCKED LOCAL SCAN BEEP);
528    
529     # display screen
530     sub display {
531 root 1.1 my $i = 0x2000;
532    
533 root 1.10 my $leds = join " ", map $KSTATUS & 2**$_ ? "\e[7m$LED[$_]\e[m" : "$LED[$_]", reverse 0 .. $#LED;
534    
535     my $scr = sprintf "\e[H--- LED [ %s ] CLK %d\e[K\n", $leds, $CLK;
536 root 1.6
537     $scr .= "\e[?5" . ($DC11_REVERSE ? "h" : "l");
538 root 1.5
539 root 1.1 line:
540 root 1.6 for my $y (0 .. 25) { # ntsc, two vblank delay lines, up to 24 text lines
541     my $prev_sgr;
542    
543 root 1.9 $scr .= sprintf "%2d \xe2\x94\x82", $y;
544 root 1.1
545 root 1.6 for (0..139) {
546     my $c = $M[$i];
547 root 1.1
548     if ($c == 0x7f) { # also 0xff, but the firmware avoids that
549 root 1.9 $scr .= "\e[m\xe2\x94\x82\e[K\n";
550 root 1.1
551 root 1.6 my $a1 = $M[$i + 1];
552     my $a0 = $M[$i + 2];
553 root 1.1
554     $i = 0x2000 + (($a1 * 256 + $a0) & 0xfff);
555    
556     next line;
557     }
558    
559 root 1.10 my $sgr = $SGR[ ($M[$i++ + 0x1000] & 15) | ($c & 0x80)];
560 root 1.6
561     $scr .= $prev_sgr = $sgr if $sgr ne $prev_sgr;
562    
563 root 1.10 $scr .= $CHARMAP[$c & 0x7f];
564 root 1.1 }
565    
566 root 1.6 $scr .= "\e[K\nvideo overflow\e[K\n";
567 root 1.1 last;
568     }
569    
570 root 1.10 $scr .= "\e[m\e[J";
571 root 1.1
572     syswrite STDOUT, $scr;
573     }
574    
575     #############################################################################
576 root 1.10 # keyboard handling
577 root 1.1
578 root 1.7 # 0x080 shift, 0x100 ctrl
579 root 1.1 my %KEYMAP = (
580 root 1.8 "\t" => 0x3a,
581     "\r" => 0x64,
582     "\n" => 0x44,
583    
584     "\x00" => 0x77 | 0x100, # CTRL-SPACE
585     "\x1c" => 0x45 | 0x100, # CTRL-\
586     "\x1d" => 0x14 | 0x100, # CTRL-]
587     "\x1e" => 0x24 | 0x100, # CTRL-~
588     "\x1f" => 0x75 | 0x100, # CTRL-?
589    
590     # hardcoded rxvt keys
591     "\e" => 0x2a, # ESC
592     "\e[3~" => 0x03, # DC
593     "\e[5~" => 0x7e, # CAPS LOCK (prior)
594     "\e[6~" => 0x6a, # NO SCROLL (next)
595     "\e[A" => 0x30, # UP
596     "\e[B" => 0x22, # DOWN
597     "\e[C" => 0x10, # RIGHT
598     "\e[D" => 0x20, # LEFT
599     "\e[a" => 0x30 | 0x080, # UP
600     "\e[b" => 0x22 | 0x080, # DOWN
601     "\e[c" => 0x10 | 0x080, # RIGHT
602     "\e[d" => 0x20 | 0x080, # LEFT
603     "\e[7~" => 0x7b, # SETUP (home)
604     "\e[8~" => 0x23, # BREAK (end)
605     "\e[8\$" => 0x23 | 0x080, # SHIFT BREAK / DISCONNECT (shift-end)
606     "\x7f" => 0x33, # BACKSPACE
607    
608     "\e[11~" => 0x32, # F1
609     "\e[11~" => 0x42, # F2
610     "\e[11~" => 0x31, # F3
611     "\e[11~" => 0x41, # F4
612 root 1.1 );
613    
614 root 1.10 @KEYMAP{map chr, 0x20 .. 0x40, 0x5b .. 0x7e} = unpack "C*", pack "H*",
615     "779ad5a9a8b8a755a6b5b6b466256575" . "351a3929283837273626d656e634e5f5" . "b9" # 20..40
616     . "154514b7a5" . "244a6879591949485816574746766706" . "050a185a0817780969077a95c594a4"; # 5b..7e
617 root 1.1
618 root 1.7 $KEYMAP{"\x1f" & $_} ||= $KEYMAP{$_} | 0x100 for "a" .. "z"; # ctrl
619 root 1.10 $KEYMAP{"\x20" ^ $_} ||= $KEYMAP{$_} | 0x080 for "a" .. "z"; # shift
620 root 1.1
621     my $KEYMATCH = join "|", map quotemeta, reverse sort keys %KEYMAP;
622     $KEYMATCH = qr{^($KEYMATCH)}s;
623    
624 root 1.10 my %KMOD;
625    
626 root 1.1 sub key {
627     my ($key) = @_;
628    
629 root 1.10 push @KQUEUE, -0x7c if !($key & 0x100) && delete $KMOD{0x7c}; # ctrl-up
630     push @KQUEUE, -0x7d if !($key & 0x080) && delete $KMOD{0x7d}; # shift-up
631 root 1.1
632 root 1.10 push @KQUEUE, 0x7c if $key & 0x100 && !$KMOD{0x7c}++; # ctrl-down
633     push @KQUEUE, 0x7d if $key & 0x080 && !$KMOD{0x7d}++; # shift-down
634 root 1.1
635     $key &= 0x7f;
636     push @KQUEUE, $key, -$key;
637     }
638    
639     my $STDIN_BUF;
640    
641     sub stdin_parse {
642     key $KEYMAP{$1}
643     while $STDIN_BUF =~ s/$KEYMATCH//;
644    
645     # skip input we can't decipher
646     substr $STDIN_BUF, 0, 1, "";
647     }
648    
649     if ($KBD) {
650     system "stty -icanon -icrnl -inlcr -echo min 1 time 0";
651     eval q{ sub END { system "stty sane" } };
652     $SIG{INT} = $SIG{TERM} = $SIG{QUIT} = sub { exit 1 };
653     }
654    
655     #############################################################################
656 root 1.10 # initial key input, to set up online mode etc.
657     # could be done via nvram defaults
658    
659     @KQUEUE = (
660     0x7b, -0x7b, # setup
661     0, # delay
662     0x28, -0x28, # 4, toggle local/online
663     0x38, -0x38, # 5, setup b
664     0, # delay
665     (0x10, -0x10) x 2, # cursor right
666     0x37, -0x37, # 6 toggle soft scroll
667     (0x10, -0x10) x 1, # cursor right
668     0x37, -0x37, # 6 toggle autorepeat off
669     (0x10, -0x10) x 8, # cursor right
670     0x37, -0x37, # 6 toggle keyclick
671     (0x10, -0x10) x 1, # cursor right
672     $VT102 ? () : (0x37, -0x37), # 6 toggle ansi/vt52
673     (0x10, -0x10) x 7, # cursor right
674     0x37, -0x37, # 6 toggle wrap around
675     0x7b, -0x7b, # leave setup
676     );
677    
678     #############################################################################
679     # process/pty management
680    
681     require IO::Pty;
682     $PTY = IO::Pty->new;
683    
684     my $slave = $PTY->slave;
685    
686     $PTY->set_winsize (24, 80);
687    
688     unless (fork) {
689     $ENV{TERM} = $VT102 ? "vt102" : "vt100";
690    
691     close $PTY;
692    
693     open STDIN , "<&", $slave;
694     open STDOUT, ">&", $slave;
695     open STDERR, ">&", $slave;
696    
697     system "stty ixoff erase ^H";
698    
699     $PTY->make_slave_controlling_terminal;
700     $PTY->close_slave;
701    
702     @ARGV = "sh" unless @ARGV;
703     exec @ARGV;
704     }
705    
706     $PTY->close_slave;
707    
708     #############################################################################
709     # the actual hardware simulator
710 root 1.1
711     my @ICACHE; # compiled instruction cache
712    
713     while () {
714     # execute extended basic blocks
715     $PC = ($ICACHE[$PC] ||= do {
716     my $pc = $PC;
717    
718     my $insn = "";
719    
720     # the jit compiler
721 root 1.10 for (0..31) {
722 root 1.1 my $imm;
723     my $op = $op[$M[$pc++]];
724    
725     for ($op) {
726     s/\bPUSH\b/\$M[--\$SP] =/g; # push byte to stack
727     s/\bPOP\b/\$M[\$SP++]/g; # pop byte from stack
728    
729     s/\bIMM16\b/$imm \/\/= $M[$pc++] + $M[$pc++] * 256/xge; # 16 bit insn immediate
730     s/\bIMM8\b /$imm \/\/= $M[$pc++] /xge; # 8 bit insn immediate
731    
732     s/\bPC\b/$pc/ge; # PC at end of insn
733     s/\bBRA\b/return/g; # conditional jump
734     s/\bJMP\b(.*)/$1\x00/sg; # unconditional jump
735    
736     s/\bIN\b/ sprintf "\$A = in_%02x", $M[$pc++]/xge;
737     s/\bOUT\b/sprintf "out_%02x \$A ", $M[$pc++]/xge;
738     }
739    
740     $insn .= "$op;\n";
741     }
742    
743    
744 root 1.12 $insn .= $pc;
745 root 1.1 $insn =~ s/\x00.*$//s;
746    
747     eval "use integer; sub { $insn }" or die "$insn: $@"
748     })->();
749    
750     ++$CLK;
751    
752     # things we do from time too time only
753     unless ($CLK & 0xf) {
754     # do I/O
755    
756 root 1.10 unless ($CLK & 0xfff) {
757 root 1.1
758     # pty/serial I/O
759 root 1.10 unless ((@PUSARTRECV >= 128) || @KQUEUE || !$PTY) {
760 root 1.1 my $rin = ""; (vec $rin, fileno $PTY, 1) = 1;
761    
762     if (select $rin, undef, undef, 0) {
763     sysread $PTY, my $buf, 256;
764     push @PUSARTRECV, unpack "C*", $buf;
765     }
766     }
767    
768     # keyboard input
769     if ($KBD) {
770     while (select my $rin = "\x01", undef, undef, 0) {
771     sysread STDIN, $STDIN_BUF, 1, length $STDIN_BUF
772     or last;
773     }
774    
775     stdin_parse if length $STDIN_BUF;
776     }
777     }
778    
779     # kick off various interrupts
780    
781 root 1.3 $RST |= 2 if @PUSARTRECV && $XON; # VT100, but works on vt102, too (probably not used on real hardware though)
782     #$INTPEND |= 2 if @PUSARTRECV && $XON; # VT102, 6.5 rxrdy
783 root 1.1
784 root 1.3 # kick off vertical retrace form time to time
785 root 1.5 unless ($CLK & 0x1ff) {
786 root 1.1 $RST |= 4; # vertical retrace
787     }
788    
789     # handle video hardware
790 root 1.10 unless ($CLK & 0x3fff) {
791     display;
792 root 1.1 }
793     }
794 root 1.4
795     # the interrupt logic
796 root 1.10 if (($RST || ($INTPEND & ~$INTMASK)) && $IFF) {
797 root 1.4 # rst 1 kbd data available
798     # rst 2 pusart xmit+recv flag
799     # rst 4 vertical retrace
800     # 5.5 vt125 mb7 trans ready (serial send?)
801     # 6.5 vt125 mb7 read ready (something modem?)
802     # 7.5 vt125 mb7 vblank h(?)
803     # trap vt125 mbi init h(?)
804     my $vec;
805    
806 root 1.10 $x = $INTPEND & ~$INTMASK;
807    
808 root 1.4 if ($x & 1) { $vec = 0x2c; $INTPEND &= ~1;
809     } elsif ($x & 2) { $vec = 0x34; $INTPEND &= ~2;
810     } elsif ($x & 4) { $vec = 0x3c; $INTPEND &= ~4;
811 root 1.10 # } elsif ($RST ) { $vec = $RST * 8; $RST = 0; # the vt102 firmware doesn't like combined interrupts
812 root 1.4 } elsif ($RST & 1) { $vec = 0x08; $RST &= ~1; # separate is better for vt102
813     } elsif ($RST & 2) { $vec = 0x10; $RST &= ~2;
814     } elsif ($RST & 4) { $vec = 0x20; $RST &= ~4;
815     } else {
816     die;
817     }
818    
819     $M[--$SP] = $PC >> 8;
820     $M[--$SP] = $PC & 0xff;
821     $PC = $vec;
822    
823     $IFF = 0;
824     }
825 root 1.1 }
826    
827 root 1.10 #############################################################################
828     # roms in the data section + one newline
829     #
830     # vt100 @ 0x0000+0x0800 23-032E2
831     # vt100 @ 0x0800+0x0800 23-061E2
832     # vt100 @ 0x1000+0x0800 23-033E2
833     # vt100 @ 0x1800+0x0800 23-034E2
834     #
835 root 1.11 # vt102 @ 0x0000+0x2000 23-226E4
836     # vt102 @ 0x8000+0x2000 23-225E4
837 root 1.10 #
838     # vt131 @ 0xa000+0x0800 23-280E2
839     #
840    
841 root 1.1 __DATA__
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