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/cvs/vt102/vt102
Revision: 1.3
Committed: Mon Dec 1 18:26:20 2014 UTC (9 years, 5 months ago) by root
Branch: MAIN
Changes since 1.2: +22 -15 lines
Log Message:
*** empty log message ***

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 1.1 # this hack is not considered release ready in and way, shape, or form
21     # ./vt102 bash
22     # ./vt102 telnet towel.blinkenlights.nl
23     # ./vt102 curl http://artscene.textfiles.com/vt100/trekvid.vt
24     # ./vt102 curl http://artscene.textfiles.com/vt100/surf.vt # in 3d!
25    
26 root 1.3 # TODO: ctrl
27    
28 root 1.1 use common::sense;
29    
30     $| = 1;
31    
32 root 1.3 my $VT102 = 1;
33 root 1.1 my $AVO = $VT102 || 1;
34     my $KBD = 1;
35    
36     #############################################################################
37    
38     my $PTY; # the pty we allocated, if any
39    
40     my $ROM = do {
41     binmode DATA;
42     local $/;
43     <DATA>
44     };
45    
46     0x6001 == length $ROM or die "corrupted rom image";
47    
48     binmode STDOUT;
49    
50     my @M = (0xff) x 65536; # main memory, = (0xff) x 65536;
51    
52     # populate mem with rom contents
53     if ($VT102) {
54     @M[0x0000 .. 0x1fff] = unpack "C*", substr $ROM, 0x2000, 0x2000;
55     @M[0x8000 .. 0x9fff] = unpack "C*", substr $ROM, 0x4000, 0x2000;
56     } else {
57     @M[0x0000 .. 0x1fff] = unpack "C*", substr $ROM, 0x0000, 0x2000;
58     }
59    
60     #############################################################################
61    
62     my $PRSTATUS = 0;
63    
64     # 8080/8085 registers
65     # b, c, d, e, h, l, a
66     my ($A, $B, $C, $D, $E, $H, $L, $A);
67     my ($PC, $SP, $IFF, $FA, $FZ, $FS, $FP, $FC);
68    
69     my $RST = 0; # 8080 pending interrupts
70     my $INTMASK = 7; # 8085 half interrupts
71     my $INTPEND = 0; # 8085 half interrupts
72    
73     my $x; # dummy temp for instructions
74    
75     my $CLK; # rather inexact clock
76    
77     #############################################################################
78    
79     # nvram
80     my @NVR = (0x3fff) x 100; # vt102: 214e accum, 214f only lower 8 bit used, first 44 bytes
81     my $NVRADDR;
82     my $NVRDATA;
83     my $NVRLATCH;
84    
85     #$NVR[$_] = $_ for 0..99;#d#
86    
87     my @NVRCMD = (
88     sub { # accept data
89     $NVRDATA = ($NVRDATA << 1) + $_[1];
90     },
91     sub { # accept addr
92     $NVRADDR = ($NVRADDR << 1)+ $_[1];
93     },
94     sub { # shift out
95     my $bit = $NVRDATA & 0x02000;
96     $NVRDATA *= 2;
97     $bit
98     },
99     undef,
100     sub { # write
101     print "NVR WRITE $_[0]\n";#d#
102     $NVR[$_[0]] = $NVRDATA & 0x3fff;
103     },
104     sub { # erase
105     print "NVR ERASE $_[0]\n";#d#
106     $NVR[$_[0]] = 0x3fff;
107     },
108     sub { # read
109     # print "NVR READ $_[0] = $NVR[$_[0]]\n";#d#
110     $NVRDATA = $NVR[$_[0]];
111     },
112     sub { # standby
113     },
114     );
115    
116     my @bitidx;
117     $bitidx[1 << $_] = 9 - $_ for 0..9;
118    
119     # the nvr1400 state machine. what a monster
120     sub nvr() {
121     my $a1 = $bitidx[(~$NVRADDR ) & 0x3ff];
122     my $a0 = $bitidx[(~$NVRADDR >> 10) & 0x3ff];
123    
124     # printf "NVR %02x A %020b %d %d D %02x\n", $NVRLATCH, $NVRADDR & 0xfffff, $a1, $a0, $NVRDATA;
125    
126     $NVRCMD[($NVRLATCH >> 1) & 7]($a1 * 10 + $a0, $NVRLATCH & 1)
127     }
128    
129     #############################################################################
130    
131     my $DC11 = 0; # 4 bit commands
132     my $DC12 = 0;
133    
134     my $XON = 1; # false if terminal wants us to pause
135     my $PUSARTCMD;
136    
137     my @KXMIT; # current scan queue
138     my %KXMIT; # currently pressed keys
139     my @KQUEUE; # key event queue
140     my $KXCNT; # count for debouncew
141     my @PUSARTRECV;
142     my $KSTATUS;
143    
144     sub out_00 { # pusartdata
145     # handle xon/xoff, but also pass it through
146     if ($_[0] == 0x13) {
147     $XON = 0;
148 root 1.3 return;#d#
149 root 1.1 } elsif ($_[0] == 0x11) {
150     $XON = 1;
151 root 1.3 return;#d#
152 root 1.1 }
153    
154     syswrite $PTY, chr $_[0];
155    
156 root 1.3 $INTPEND |= 1;
157 root 1.1 }
158    
159     sub out_01 {
160     $PUSARTCMD = shift;
161    
162     $INTPEND |= 1 if $PUSARTCMD & 0x01; # VT102, 5.5 txrdy
163 root 1.3 $INTPEND |= 2 if $PUSARTCMD & 0x04 && !@PUSARTRECV; # VT102, 6.5 rxrdy, needed for some reason
164 root 1.1 }
165    
166     sub out_02 { } # baudrate generator
167    
168     sub out_23 { } # unknown
169     sub out_27 { } # unknown
170     sub out_2f { } # unknown, connected to in 0f
171    
172     sub out_42 { } # brightness
173    
174     sub out_62 {
175     $NVRLATCH = shift;
176     }
177    
178     sub out_a2 { $DC11 = shift }
179     sub out_c2 { } # unknown
180     sub out_d2 { $DC12 = shift }
181    
182     sub out_82 {
183     # keyboard
184    
185     # CLICK STARTSCAN ONLINE LOCKED | CTS DSR INSERT L1(?)
186     # CLICK STARTSCAN ONLINE LOCKED | LED1 LED2 LED3 LED4
187     $KSTATUS = $_[0];
188    
189     # start new scan unless scan in progress
190     if (($_[0] & 0x40) && !@KXMIT) {
191     # do not reply with keys in locked mode
192     # or during post (0xff),
193     # mostly to skip init and not fail POST,
194     # and to send startup keys only when terminal is ready
195     unless (($_[0] & 0x10) || ($_[0] == 0xff) || ($VT102 && $INTMASK == 0x07)) {
196     if ($KXCNT <= 0 && @KQUEUE) {
197     my $c = shift @KQUEUE;
198    
199     if ($c < 0) { # key up
200     delete $KXMIT{-$c};
201     $KXCNT = 10;
202     } elsif ($c > 0) { # key down
203     undef $KXMIT{$c};
204     $KXCNT = 10;
205     } else { # delay
206     $KXCNT = 100;
207     }
208     }
209    
210     --$KXCNT;
211     @KXMIT = sort keys %KXMIT;
212     }
213    
214     $RST |= 1;
215     }
216     }
217    
218     #############################################################################
219    
220     my $NVRBIT;
221     my $LBA;
222    
223     sub in_00 { # pusart data
224 root 1.3 # interrupt not generated here, because infinite
225     # speed does not go well with the vt102.
226 root 1.1
227     shift @PUSARTRECV
228     }
229    
230     sub in_01 { # pusart status
231     # DSR SYNDET FE OE | PE TXEMPTY RXRDY TXRDY
232     0x85 + (@PUSARTRECV && 0x02)
233     }
234    
235     sub in_22 { # modem buffer(?)
236     # wild guess: -CTS -SPDI -RI -CD 0 0 0 0
237     0x20
238     }
239    
240     sub in_0f { } # unknown, connected to out 2f
241    
242     sub in_42 { # flag buffer
243     ++$LBA;
244    
245     $NVRBIT = nvr ? 0x20 : 0x00 if ($LBA & 0x3) == 0x2;
246    
247     # KBD_XMITEMPTY LBA7 NVRDATA ODDFIELD - OPTION !GFX !AVO PUSART_TXRDY
248    
249     my $f = 0x85 | $NVRBIT;
250    
251     $f |= 0x02 unless $AVO;
252     $f |= 0x40 if $LBA & 0x2;
253    
254     $f
255     }
256    
257     sub in_82 { # tbmt keyboard uart
258     return 0x7f unless @KXMIT;
259    
260     $RST |= 1;
261     shift @KXMIT
262     }
263    
264     sub in_03 { 0xff } # unknown, printer uart input?
265     sub in_0b { 0xff } # unknown
266     sub in_17 { 0xff } # unknown, printer status clear by reading?
267     sub in_1b { 0xff } # unknown
268    
269     #############################################################################
270    
271 root 1.3 sub sf { # set flags (ZSC - AP not implemented)
272 root 1.1 $FS = $_[0] & 0x080;
273     $FZ = ($_[0] & 0x0ff) == 0;
274     $FC = $_[0] & 0x100;
275    
276     $_[0] & 0xff
277     }
278    
279 root 1.3 sub sf_nc { # set flags except carry
280 root 1.1 $FS = $_[0] & 0x080;
281     $FZ = ($_[0] & 0x0ff) == 0;
282    
283     $_[0] & 0xff
284     }
285    
286     my @op = map { sprintf "status(); die 'unknown op %02x'", $_ } 0 .. 255;
287     my @ops;
288    
289     my @reg = qw($B $C $D $E $H $L $M[$H*256+$L] $A);
290     my @cc = ('if !$FZ', 'if $FZ', 'if !$FC', 'if $FC', ';die', ';die', 'if !$FS', 'if $FS'); # die == unimplemented $FP parity
291    
292     # mov r,r / r,M / M,r
293     for my $s (0..7) {
294     for my $d (0..7) {
295     $op[0x40 + $d * 8 + $s] = "$reg[$d] = $reg[$s]";
296     }
297     }
298    
299     $op[0x00] = '';
300    
301     $op[0x01] = '($B, $C) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi
302     $op[0x11] = '($D, $E) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi
303     $op[0x21] = '($H, $L) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi
304     $op[0x31] = '$SP = IMM16' ; # lxi #d# 0xf000 because of limited stack
305    
306     $op[0x02] = '$M[$B * 256 + $C] = $A'; # stax
307     $op[0x12] = '$M[$D * 256 + $E] = $A'; # stax
308     $op[0x32] = '$M[IMM16 ] = $A'; # sta
309    
310     sub inxdcx($$$) {
311     $x = ($_[0] * 256 + $_[1] + $_[2]) & 0xffff;
312     $_[0] = $x >> 8;
313     $_[1] = $x & 0xff;
314     }
315    
316     $op[0x03] = 'inxdcx $B, $C, 1'; # inx
317     $op[0x13] = 'inxdcx $D, $E, 1'; # inx
318     $op[0x23] = 'inxdcx $H, $L, 1'; # inx
319     $op[0x33] = '$SP++' ; # inx
320     $op[0x0b] = 'inxdcx $B, $C, -1'; # dcx
321     $op[0x1b] = 'inxdcx $D, $E, -1'; # dcx
322     $op[0x2b] = 'inxdcx $H, $L, -1'; # dcx
323     $op[0x3b] = '--$SP' ; # dcx
324    
325     # "no carry" doesn't seem to be needed for vt100 - optimize?
326     $op[0x04 + $_ * 8] = "$reg[$_] = sf_nc $reg[$_] + 1" for 0..7; # inr
327     $op[0x05 + $_ * 8] = "$reg[$_] = sf_nc $reg[$_] - 1" for 0..7; # dcr
328    
329     # mvi r / M
330     $op[0x06 + $_ * 8] = "$reg[$_] = IMM8" for 0..7;
331    
332     # getting this insn wrong (its the only 16 bit insn to modify flags)
333     # wasted three of my best days with mindless vt102 rom reverse engineering
334     sub dad {
335     $x = $H * 256 + $L + $_[0];
336    
337     ($H, $L) = (($x >> 8) & 0xff, $x & 0xff);
338     $FC = $x > 0xffff;
339     }
340    
341     $op[0x09] = 'dad $B * 256 + $C'; # dad
342     $op[0x19] = 'dad $D * 256 + $E'; # dad
343     $op[0x29] = 'dad $H * 256 + $L'; # dad
344     $op[0x39] = 'dad $SP '; # dad
345    
346     $op[0x07] = ' $FC = $A >> 7; $A = ($A * 2 + $FC) & 0xff '; # rlc
347     $op[0x17] = ' ($FC, $A) = ($A >> 7, ($A * 2 + $FC) & 0xff)'; # ral
348    
349     $op[0x0f] = ' $FC = $A & 1; $A = ($A >> 1) | ($FC && 0x80) '; # rrc
350     $op[0x1f] = ' ($FC, $A) = ($A & 1, ($A >> 1) | ($FC && 0x80))'; # rar
351    
352     $op[0x0a] = '$A = $M[$B * 256 + $C]'; # ldax b
353     $op[0x1a] = '$A = $M[$D * 256 + $E]'; # ldax d
354     $op[0x3a] = '$A = $M[IMM16]'; # lda
355    
356     $op[0x20] = '$A = $INTPEND * 16 + $INTMASK + ($IFF && 8)'; # rim (incomplete)
357     $op[0x30] = '$INTMASK = $A & 7 if $A & 8'; # sim (incomplete)
358    
359     $op[0x22] = '($M[IMM16], $M[IMM16 + 1]) = ($L, $H)'; # shld
360     $op[0x2a] = '($L, $H) = ($M[IMM16], $M[IMM16 + 1])'; # lhld
361    
362     # yeah, the fucking setup screens actually use daa...
363     $op[0x27] = '
364     my ($h, $l);
365    
366     ($h, $l) = ($A >> 4, $A & 15);
367    
368     if ($l > 9 || $FA) {
369     $A = sf $A + 6;
370     ($h, $l) = ($A >> 4, $A & 15);
371     }
372    
373     if ($h > 9 || $FC) {
374     $h += 6;
375     $A = ($h * 16 + $l) & 0xff;
376     }
377     '; # daa, almost certainly borked, also, acarry not set by sf
378    
379     $op[0x2f] = '$A ^= 0xff'; # cma
380    
381     $op[0x37] = '$FC = 1 '; # stc
382     $op[0x3f] = '$FC = !$FC'; # cmc
383    
384     $op[0x76] = 'die "HLT"'; # hlt
385    
386     $op[0x80 + $_] = '$A = sf $A + ' . $reg[$_] for 0..7; # add
387     $op[0x88 + $_] = '$A = sf $A + $FC + ' . $reg[$_] for 0..7; # adc
388     $op[0x90 + $_] = '$A = sf $A - ' . $reg[$_] for 0..7; # sub
389     $op[0x98 + $_] = '$A = sf $A - $FC - ' . $reg[$_] for 0..7; # sbb
390     $op[0xa0 + $_] = '$A = sf $A & ' . $reg[$_] for 0..7; # ana
391     $op[0xa8 + $_] = '$A = sf $A ^ ' . $reg[$_] for 0..7; # xra
392     $op[0xb0 + $_] = '$A = sf $A | ' . $reg[$_] for 0..7; # ora
393     $op[0xb8 + $_] = ' sf $A - ' . $reg[$_] for 0..7; # cmp
394     # possible todo: optimize ora a, maybe xra a
395    
396     $op[0xc6 + $_] = '$A = sf $A + IMM8'; # adi
397     $op[0xd6 + $_] = '$A = sf $A - IMM8'; # sui
398     $op[0xe6 + $_] = '$A = sf $A & IMM8'; # ani
399     $op[0xee + $_] = '$A = sf $A ^ IMM8'; # xri
400     $op[0xf6 + $_] = '$A = sf $A | IMM8'; # ori
401     $op[0xfe + $_] = ' sf $A - IMM8'; # cpi
402    
403     $op[0xc1] = '($C, $B) = (POP, POP)'; # pop
404     $op[0xd1] = '($E, $D) = (POP, POP)'; # pop
405     $op[0xe1] = '($L, $H) = (POP, POP)'; # pop
406     $op[0xf1] = '($x, $A) = (POP, POP); ($FS, $FZ, $FA, $FP, $FC) = (!!($x & 0x80), !!($x & 0x40), !!($x & 0x10), !!($x & 0x04), !!($x & 0x01))'; # pop psw
407    
408     $op[0xeb] = '($D, $E, $H, $L) = ($H, $L, $D, $E)'; # xchg
409    
410     $op[0xc2 + $_ * 8] = 'BRA IMM16 ' . $cc[$_] for 0..7; # jcc
411     $op[0xc3] = 'JMP IMM16'; # jmp
412    
413     $op[0xc4 + $_ * 8] = '(PUSH PC >> 8), (PUSH PC & 0xff), (BRA IMM16) ' . $cc[$_] for 0..7; # ccc
414     $op[0xcd] = '(PUSH PC >> 8), (PUSH PC & 0xff), (BRA IMM16)'; # call
415    
416     $op[0xc7 + $_ * 8] = "JMP $_ * 8" for 0..7; # rst
417    
418     $op[0xc0 + $_ * 8] = 'BRA POP + POP * 256 ' . $cc[$_] for 0..7; # rcc
419     $op[0xc9] = 'JMP POP + POP * 256'; # ret
420    
421     $op[0xc5] = 'PUSH $B; PUSH $C';
422     $op[0xd5] = 'PUSH $D; PUSH $E';
423     $op[0xe5] = 'PUSH $H; PUSH $L';
424     $op[0xf5] = 'PUSH $A; PUSH +($FS && 0x80) | ($FZ && 0x40) | ($FA && 0x10) | ($FP && 0x04) | ($FC && 0x01)'; # psw
425    
426     $op[0xd3] = 'OUT'; # out
427     $op[0xdb] = 'IN'; # in
428    
429     # e3 xthl @ 917b, hl <-> (sp)
430    
431     $op[0xe9] = 'JMP $H * 256 + $L'; # pchl
432    
433     $op[0xf3] = '$IFF = 0'; # DI
434     $op[0xfb] = '$IFF = 1'; # EI
435    
436     @ops = @op; # for debugging #d#
437    
438     #############################################################################
439    
440     # print cpu status, for debugging
441     sub status {
442     my $PC = shift || $PC;
443    
444     printf "%04x/%04x A=%02x BC=%02x:%02x DE=%02x:%02x HL=%02x:%02x ZSCAP=%s: %02x %s\n",
445     $PC, $SP,
446     $A, $B, $C, $D, $E, $H, $L,
447     ($FZ ? "1" : "0")
448     . ($FS ? "1" : "0")
449     . ($FC ? "1" : "0")
450     . ($FA ? "1" : "0")
451     . ($FP ? "1" : "0"),
452     $M[$PC], $ops[$M[$PC]];
453     }
454    
455     #############################################################################
456    
457     my @chr = (
458     " ",
459     "\x{29eb}",
460     "\x{2592}",
461     "\x{2409}",
462     "\x{240c}",
463     "\x{240d}",
464     "\x{240a}",
465     "\x{00b0}",
466     "\x{00b1}",
467     "\x{2424}",
468     "\x{240b}",
469     "\x{2518}",
470     "\x{2510}",
471     "\x{250c}",
472     "\x{2514}",
473     "\x{253c}",
474     "\x{23ba}",
475     "\x{23bb}",
476     "\x{2500}",
477     "\x{23bc}",
478     "\x{23bd}",
479     "\x{251c}",
480     "\x{2524}",
481     "\x{2534}",
482     "\x{252c}",
483     "\x{2502}",
484     "\x{2264}",
485     "\x{2265}",
486     "\x{03c0}",
487     "\x{2260}",
488 root 1.2 "\x{00a3}",
489 root 1.1 "\x{00b7}",
490     (map chr, 0x020 .. 0x7e),
491     "?",
492     );
493    
494     utf8::encode $_ for @chr;
495    
496     sub prscr {
497     my $i = 0x2000;
498    
499     my $scr = sprintf "\x1b[H--- KBD %08b CLK %d PC %04x RST %03b IFF %01b PUS %02x IM %03b\x1b[K\n", $KSTATUS, $CLK, $PC, $RST, $IFF, $PUSARTCMD, $INTMASK;
500    
501     line:
502     for my $y (0 .. 25) {
503     $scr .= sprintf "%2d |", ++$y;
504    
505     for (0..140) {
506     my $c = $M[$i++];
507    
508     # printf "%04x %02x\n", $i-1,$c;
509    
510     if ($c == 0x7f) { # also 0xff, but the firmware avoids that
511     $scr .= "|\x1b[K\n";
512    
513     my $a1 = $M[$i++];
514     my $a0 = $M[$i++];
515    
516     $i = 0x2000 + (($a1 * 256 + $a0) & 0xfff);
517    
518     next line;
519     }
520    
521     $scr .= "\x1b[7m" if $c & 0x80;
522     $scr .= $chr[$c & 0x7f] // sprintf "[%02x]", $c & 0x7f;
523     $scr .= "\x1b[m" if $c & 0x80;
524     }
525    
526     $scr .= "\x1b[K\noverflow\x1b[K\n";
527     last;
528     }
529    
530     if (0) {
531     $scr .= "\x1b[K\n";
532     for my $o (0x200 .. 0x232) {
533     $scr .= sprintf "%04x:", $o * 16;
534     for (0..15) {
535     $scr .= sprintf " %02x", $M[$o * 16 + $_];
536     }
537     $scr .= "\x1b[K\n";
538     }
539     }
540    
541     $scr .= "\x1b[J";
542    
543     syswrite STDOUT, $scr;
544     }
545    
546     #############################################################################
547    
548     if (@ARGV) {
549     require IO::Pty;
550     $PTY = IO::Pty->new;
551    
552     my $slave = $PTY->slave;
553    
554 root 1.3 $PTY->set_winsize (24, 80);
555    
556 root 1.1 unless (fork) {
557     $ENV{TERM} = $VT102 ? "vt102" : "vt100";
558    
559     close $PTY;
560    
561     open STDIN , "<&", $slave;
562     open STDOUT, ">&", $slave;
563     open STDERR, ">&", $slave;
564    
565 root 1.3 system "stty ixoff erase ^H";
566    
567     $PTY->make_slave_controlling_terminal;
568     $PTY->close_slave;
569 root 1.1
570     exec @ARGV;
571     }
572    
573 root 1.3 $PTY->close_slave;
574    
575 root 1.1 } else {
576     open $PTY, "</dev/null" or die;#d
577     }
578    
579     #############################################################################
580    
581     # initial key input, to set up online mode etc.
582     @KQUEUE = (
583     0x7b, -0x7b, # setup
584     0, # delay
585     0x28, -0x28, # 4, toggle local/online
586     0x38, -0x38, # 5, setup b
587     0, # delay
588     (0x10, -0x10) x 2, # cursor right
589     0x37, -0x37, # 6 toggle soft scroll
590     (0x10, -0x10) x 1, # cursor right
591     0x37, -0x37, # 6 toggle autorepeat off
592     (0x10, -0x10) x 8, # cursor right
593     0x37, -0x37, # 6 toggle keyclick
594     (0x10, -0x10) x 1, # cursor right
595     $VT102 ? () : (0x37, -0x37), # 6 toggle ansi/vt52
596     (0x10, -0x10) x 7, # cursor right
597     0x37, -0x37, # 6 toggle wrap around
598     0x7b, -0x7b, # leave setup
599     );
600    
601     #############################################################################
602    
603     # 0x80 shift, 0x100 ctrl, 0x200 toggle
604     my %KEYMAP = (
605     "\t" => 0x3a,
606     "\r" => 0x64,
607     "\n" => 0x44,
608    
609     # hardcoded rxvt keys
610     "\e" => 0x2a, # ESC
611     "\e[3~" => 0x03, # DC
612     "\e[5~" => 0x7e, # CAPS LOCK (prior)
613     "\e[6~" => 0x6a, # NO SCROLL (next)
614     "\e[A" => 0x30, # UP
615     "\e[B" => 0x22, # DOWN
616     "\e[C" => 0x10, # RIGHT
617     "\e[D" => 0x20, # LEFT
618     "\e[a" => 0x30 | 0x080, # UP
619     "\e[b" => 0x22 | 0x080, # DOWN
620     "\e[c" => 0x10 | 0x080, # RIGHT
621     "\e[d" => 0x20 | 0x080, # LEFT
622     "\e[7~" => 0x7b, # SETUP (home)
623     "\e[8~" => 0x23, # BREAK (end)
624     "\e[8\$" => 0x23 | 0x080, # SHIFT BREAK / DISCONNECT (shift-end)
625     "\x7f" => 0x33, # BACKSPACE
626    
627     "\e[11~" => 0x32, # F1
628     "\e[11~" => 0x42, # F2
629     "\e[11~" => 0x31, # F3
630     "\e[11~" => 0x41, # F4
631     );
632    
633     @KEYMAP{map chr, 0x20..0x40} = unpack "C*", pack "H*",
634     "779ad5a9a8b8a755a6b5b6b466256575" . "351a3929283837273626d656e634e5f5" . "b9";
635    
636     @KEYMAP{map chr, 0x5b .. 0x7e} = unpack "C*", pack "H*",
637     "154514b7a5" . "244a6879591949485816574746766706" . "050a185a0817780969077a95c594a4";
638    
639     $KEYMAP{"\x3f" & $_} ||= $KEYMAP{$_} | 0x100 for "a" .. "z"; # ctrl
640     $KEYMAP{uc $_} ||= $KEYMAP{$_} | 0x080 for "a" .. "z"; # shift
641    
642     my $KEYMATCH = join "|", map quotemeta, reverse sort keys %KEYMAP;
643     $KEYMATCH = qr{^($KEYMATCH)}s;
644    
645     sub key {
646     my ($key) = @_;
647    
648     state %MOD;
649    
650     push @KQUEUE, -0x7c if !($key & 0x100) && delete $MOD{0x7c}; # ctrl-up
651     push @KQUEUE, -0x7d if !($key & 0x080) && delete $MOD{0x7d}; # shift-up
652    
653     push @KQUEUE, 0x7c if $key & 0x100 && !$MOD{0x7c}++; # ctrl-down
654     push @KQUEUE, 0x7d if $key & 0x080 && !$MOD{0x7d}++; # shift-down
655    
656     $key &= 0x7f;
657     push @KQUEUE, $key, -$key;
658     }
659    
660     my $STDIN_BUF;
661    
662     sub stdin_parse {
663     key $KEYMAP{$1}
664     while $STDIN_BUF =~ s/$KEYMATCH//;
665    
666     # skip input we can't decipher
667     substr $STDIN_BUF, 0, 1, "";
668     }
669    
670     if ($KBD) {
671     system "stty -icanon -icrnl -inlcr -echo min 1 time 0";
672     eval q{ sub END { system "stty sane" } };
673     $SIG{INT} = $SIG{TERM} = $SIG{QUIT} = sub { exit 1 };
674     }
675    
676     #############################################################################
677    
678     my @ICACHE; # compiled instruction cache
679    
680     # the cpu
681     while () {
682    
683     # execute extended basic blocks
684     $PC = ($ICACHE[$PC] ||= do {
685     my $pc = $PC;
686    
687     my $insn = "";
688    
689     # the jit compiler
690     for (0..15) {
691    
692     # optional tracing support
693     if (0) {
694     $insn .= qq<
695     if (\$PRSTATUS) {
696     status $pc;
697     die unless --\$PRSTATUS;
698     }
699     >;
700     }
701    
702     my $imm;
703     my $op = $op[$M[$pc++]];
704    
705     for ($op) {
706     s/\bPUSH\b/\$M[--\$SP] =/g; # push byte to stack
707     s/\bPOP\b/\$M[\$SP++]/g; # pop byte from stack
708    
709     s/\bIMM16\b/$imm \/\/= $M[$pc++] + $M[$pc++] * 256/xge; # 16 bit insn immediate
710     s/\bIMM8\b /$imm \/\/= $M[$pc++] /xge; # 8 bit insn immediate
711    
712     s/\bPC\b/$pc/ge; # PC at end of insn
713     s/\bBRA\b/return/g; # conditional jump
714     s/\bJMP\b(.*)/$1\x00/sg; # unconditional jump
715    
716     s/\bIN\b/ sprintf "\$A = in_%02x", $M[$pc++]/xge;
717     s/\bOUT\b/sprintf "out_%02x \$A ", $M[$pc++]/xge;
718     }
719    
720     $insn .= "$op;\n";
721     }
722    
723    
724     $insn .= "$pc";
725     $insn =~ s/\x00.*$//s;
726    
727     eval "use integer; sub { $insn }" or die "$insn: $@"
728     })->();
729    
730     ++$CLK;
731    
732     #TODO: just check on ret instructions or so
733     # the interrupt logic
734     $x = $INTPEND & ~$INTMASK;
735    
736     if (($RST || $x) && $IFF) {
737     # rst 1 kbd data available
738     # rst 2 pusart xmit+recv flag
739     # rst 4 vertical retrace
740     # 5.5 vt125 mb7 trans ready (serial send?)
741     # 6.5 vt125 mb7 read ready (something modem?)
742     # 7.5 vt125 mb7 vblank h(?)
743     # trap vt125 mbi init h(?)
744     my $vec;
745    
746     if ($x & 1) { $vec = 0x2c; $INTPEND &= ~1;
747     } elsif ($x & 2) { $vec = 0x34; $INTPEND &= ~2;
748     } elsif ($x & 4) { $vec = 0x3c; $INTPEND &= ~4;
749     # } elsif ($RST ) { $vec = $RST * 8; $RST = 0; # for some reason, this breaks vt102
750     } elsif ($RST & 1) { $vec = 0x08; $RST &= ~1; # separate is better for vt102
751     } elsif ($RST & 2) { $vec = 0x10; $RST &= ~2;
752     } elsif ($RST & 4) { $vec = 0x20; $RST &= ~4;
753     } else {
754     die;
755     }
756    
757     $M[--$SP] = $PC >> 8;
758     $M[--$SP] = $PC & 0xff;
759     $PC = $vec;
760    
761     $IFF = 0;
762     }
763    
764     # things we do from time too time only
765     unless ($CLK & 0xf) {
766     # do I/O
767    
768     unless ($CLK & 0x7ff) {
769    
770     # pty/serial I/O
771     unless (@PUSARTRECV || @KQUEUE || !$PTY) {
772     my $rin = ""; (vec $rin, fileno $PTY, 1) = 1;
773    
774     if (select $rin, undef, undef, 0) {
775     sysread $PTY, my $buf, 256;
776     push @PUSARTRECV, unpack "C*", $buf;
777     }
778     }
779    
780     # keyboard input
781     if ($KBD) {
782     while (select my $rin = "\x01", undef, undef, 0) {
783     sysread STDIN, $STDIN_BUF, 1, length $STDIN_BUF
784     or last;
785     }
786    
787     stdin_parse if length $STDIN_BUF;
788     }
789     }
790    
791     # kick off various interrupts
792    
793 root 1.3 $RST |= 2 if @PUSARTRECV && $XON; # VT100, but works on vt102, too (probably not used on real hardware though)
794     #$INTPEND |= 2 if @PUSARTRECV && $XON; # VT102, 6.5 rxrdy
795 root 1.1
796 root 1.3 # kick off vertical retrace form time to time
797 root 1.1 unless ($CLK & 0x3ff) {
798     $RST |= 4; # vertical retrace
799     }
800    
801     # handle video hardware
802    
803     unless ($CLK & 0x1fff) {
804     prscr;
805     }
806     }
807     }
808    
809     __DATA__
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825     G:! x( 2 )1 #!{
826     !:~ O#
827     ##
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829     B
830     C
831     D
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834     I J
835     K
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840     ~!
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852     !} L>w!3"@!b
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855     -
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