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Comparing vt102/vt102 (file contents):
Revision 1.3 by root, Mon Dec 1 18:26:20 2014 UTC vs.
Revision 1.15 by root, Wed Dec 3 02:14:56 2014 UTC

… …
15# 15#
16 16
17# If this file contains embedded ROMs, the above copyright notice does 17# If this file contains embedded ROMs, the above copyright notice does
18# not apply to them. 18# not apply to them.
19 19
20# this hack is not considered release ready in and way, shape, or form 20use strict;
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# TODO: ctrl
27
28use common::sense; 21#use common::sense;
29
30$| = 1;
31 22
32my $VT102 = 1; 23my $VT102 = 1;
33my $AVO = $VT102 || 1; 24my $VT131 = 0;
34my $KBD = 1; 25my $AVO = 1;
35 26
27shift, ($VT102 = 0), ($AVO = 0) if $ARGV[0] =~ /^-?-vt100$/;
28shift, ($VT102 = 0) if $ARGV[0] =~ /^-?-vt100\+avo$/;
29shift if $ARGV[0] =~ /^-?-vt102$/;
30shift, ($VT131 = 1) if $ARGV[0] =~ /^-?-vt131$/;
31
32if ($ARGV[0] =~ /^-/) {
33 die <<EOF;
34
35VT102, A VT100/101/102/131 SIMULATOR
36
37Usage:
38
39 $0 [option] [program [args]]
40
41Examples:
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
48Option can be one of:
49
50 --vt100
51 --vt100+avo
52 --vt102
53 --vt131
54
55Non-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
63Set-Up Guide:
64
65 http://vt100.net/docs/vt102-ug/chapter3.html#S3.6
66
67Author:
68
69 Marc Lehmann <vt102\@schmorp.de>
70
71EOF
72}
73
36############################################################################# 74#############################################################################
75# ROM/hardware init
37 76
38my $PTY; # the pty we allocated, if any 77my $PTY; # the pty we allocated, if any
78my $KBD = 1;
39 79
40my $ROM = do { 80my $ROMS = do {
41 binmode DATA; 81 binmode DATA;
42 local $/; 82 local $/;
43 <DATA> 83 <DATA>
44}; 84};
45 85
460x6001 == length $ROM or die "corrupted rom image"; 860x6801 == length $ROMS or die "corrupted rom image";
47
48binmode STDOUT;
49 87
50my @M = (0xff) x 65536; # main memory, = (0xff) x 65536; 88my @M = (0xff) x 65536; # main memory, = (0xff) x 65536;
51 89
52# populate mem with rom contents 90# populate mem with rom contents
53if ($VT102) { 91if ($VT102) {
54 @M[0x0000 .. 0x1fff] = unpack "C*", substr $ROM, 0x2000, 0x2000; 92 @M[0x0000 .. 0x1fff] = unpack "C*", substr $ROMS, 0x2000, 0x2000;
55 @M[0x8000 .. 0x9fff] = unpack "C*", substr $ROM, 0x4000, 0x2000; 93 @M[0x8000 .. 0x9fff] = unpack "C*", substr $ROMS, 0x4000, 0x2000;
94 @M[0xa000 .. 0xa7ff] = unpack "C*", substr $ROMS, 0x6000, 0x0800 if $VT131;
56} else { 95} else {
57 @M[0x0000 .. 0x1fff] = unpack "C*", substr $ROM, 0x0000, 0x2000; 96 @M[0x0000 .. 0x1fff] = unpack "C*", substr $ROMS, 0x0000, 0x2000;
58} 97}
59 98
60############################################################################# 99#############################################################################
61 100# 8085 CPU registers and I/O support
62my $PRSTATUS = 0;
63 101
64# 8080/8085 registers 102# 8080/8085 registers
65# b, c, d, e, h, l, a 103# b, c, d, e, h, l, a
66my ($A, $B, $C, $D, $E, $H, $L, $A); 104my ($A, $B, $C, $D, $E, $H, $L, $A);
67my ($PC, $SP, $IFF, $FA, $FZ, $FS, $FP, $FC); 105my ($PC, $SP, $IFF, $FA, $FZ, $FS, $FP, $FC);
… …
73my $x; # dummy temp for instructions 111my $x; # dummy temp for instructions
74 112
75my $CLK; # rather inexact clock 113my $CLK; # rather inexact clock
76 114
77############################################################################# 115#############################################################################
116# the dreaded NVR1400 chip. not needed to get it going, but provided anyway
78 117
79# nvram 118# nvram
80my @NVR = (0x3fff) x 100; # vt102: 214e accum, 214f only lower 8 bit used, first 44 bytes 119my @NVR = (0x3fff) x 100; # vt102: 214e accum, 214f only lower 8 bit used, first 44 bytes
81my $NVRADDR; 120my $NVRADDR;
82my $NVRDATA; 121my $NVRDATA;
83my $NVRLATCH; 122my $NVRLATCH;
84 123
85#$NVR[$_] = $_ for 0..99;#d#
86
87my @NVRCMD = ( 124my @NVRCMD = (
88 sub { # accept data
89 $NVRDATA = ($NVRDATA << 1) + $_[1]; 125 sub { $NVRDATA = ($NVRDATA << 1) + $_[1]; }, # 0 accept data
90 }, 126 sub { $NVRADDR = ($NVRADDR << 1) + $_[1]; }, # 1 accept addr
91 sub { # accept addr 127 sub { ($NVRDATA <<= 1) & 0x4000 }, # 2 shift out
92 $NVRADDR = ($NVRADDR << 1)+ $_[1]; 128 undef, # 3 not used, will barf
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; 129 sub { $NVR[$_[0]] = $NVRDATA & 0x3fff; }, # 4 write
103 }, 130 sub { $NVR[$_[0]] = 0x3fff; }, # 5 erase
104 sub { # erase 131 sub { $NVRDATA = $NVR[$_[0]]; }, # 6 read
105 print "NVR ERASE $_[0]\n";#d# 132 sub { }, # 7 standby
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); 133);
115 134
116my @bitidx; 135my @NVR_BITIDX;
117$bitidx[1 << $_] = 9 - $_ for 0..9; 136$NVR_BITIDX[1 << $_] = 9 - $_ for 0..9;
118 137
119# the nvr1400 state machine. what a monster 138# the nvr1400 state machine. what a monster
120sub nvr() { 139sub nvr() {
121 my $a1 = $bitidx[(~$NVRADDR ) & 0x3ff]; 140 my $a1 = $NVR_BITIDX[(~$NVRADDR ) & 0x3ff];
122 my $a0 = $bitidx[(~$NVRADDR >> 10) & 0x3ff]; 141 my $a0 = $NVR_BITIDX[(~$NVRADDR >> 10) & 0x3ff];
123 142
124# printf "NVR %02x A %020b %d %d D %02x\n", $NVRLATCH, $NVRADDR & 0xfffff, $a1, $a0, $NVRDATA; 143# printf "NVR %02x A %020b %d %d D %02x\n", $NVRLATCH, $NVRADDR & 0xfffff, $a1, $a0, $NVRDATA;
125 144
126 $NVRCMD[($NVRLATCH >> 1) & 7]($a1 * 10 + $a0, $NVRLATCH & 1) 145 $NVRCMD[($NVRLATCH >> 1) & 7]($a1 * 10 + $a0, $NVRLATCH & 1)
127} 146}
128 147
129############################################################################# 148#############################################################################
149# I/O ports - output
130 150
131my $DC11 = 0; # 4 bit commands 151my $DC11_REVERSE = 0;
132my $DC12 = 0;
133 152
134my $XON = 1; # false if terminal wants us to pause 153my $XON = 1; # false if terminal wants us to pause
135my $PUSARTCMD; 154my $PUSARTCMD;
136 155
137my @KXMIT; # current scan queue 156my @KXMIT; # current scan queue
… …
173 192
174sub out_62 { 193sub out_62 {
175 $NVRLATCH = shift; 194 $NVRLATCH = shift;
176} 195}
177 196
178sub out_a2 { $DC11 = shift } 197sub out_a2 {
198 my $dc11 = 0x0f & shift;
199
200 $DC11_REVERSE = 1 if $dc11 == 0b1010;
201 $DC11_REVERSE = 0 if $dc11 == 0b1011;
202}
203
179sub out_c2 { } # unknown 204sub out_c2 { } # unknown
180sub out_d2 { $DC12 = shift } 205sub out_d2 { } # 0..3 == 80c/132c/60hz/50hz
181 206
182sub out_82 { 207sub out_82 {
183 # keyboard 208 # keyboard
184 209
185 # CLICK STARTSCAN ONLINE LOCKED | CTS DSR INSERT L1(?) 210 # CLICK STARTSCAN ONLINE LOCKED | CTS DSR INS L1
186 # CLICK STARTSCAN ONLINE LOCKED | LED1 LED2 LED3 LED4 211 # CLICK STARTSCAN ONLINE LOCKED | L1 L2 L3 L4
187 $KSTATUS = $_[0]; 212 $KSTATUS = $_[0];
188 213
189 # start new scan unless scan in progress 214 # start new scan unless scan in progress
190 if (($_[0] & 0x40) && !@KXMIT) { 215 if (($_[0] & 0x40) && !@KXMIT) {
191 # do not reply with keys in locked mode 216 # do not reply with keys in locked mode
… …
214 $RST |= 1; 239 $RST |= 1;
215 } 240 }
216} 241}
217 242
218############################################################################# 243#############################################################################
244# I/O ports - input
219 245
220my $NVRBIT; 246my $NVRBIT;
221my $LBA; 247my $LBA6; # twice the frequenxy of LBA7
222 248
223sub in_00 { # pusart data 249sub in_00 { # pusart data
224 # interrupt not generated here, because infinite 250 # interrupt not generated here, because infinite
225 # speed does not go well with the vt102. 251 # speed does not go well with the vt102.
226 252
… …
235sub in_22 { # modem buffer(?) 261sub in_22 { # modem buffer(?)
236 # wild guess: -CTS -SPDI -RI -CD 0 0 0 0 262 # wild guess: -CTS -SPDI -RI -CD 0 0 0 0
237 0x20 263 0x20
238} 264}
239 265
240sub in_0f { } # unknown, connected to out 2f 266sub in_0f { 0xff } # vt102 unknown, connected to out 2f
241 267
242sub in_42 { # flag buffer 268sub in_42 { # flag buffer
243 ++$LBA; 269 ++$LBA6;
244 270
245 $NVRBIT = nvr ? 0x20 : 0x00 if ($LBA & 0x3) == 0x2; 271 $NVRBIT = nvr ? 0x20 : 0x00 if ($LBA6 & 0x3) == 0x2;
246 272
247 # KBD_XMITEMPTY LBA7 NVRDATA ODDFIELD - OPTION !GFX !AVO PUSART_TXRDY 273 # KBD_XMITEMPTY LBA7 NVRDATA ODDFIELD - OPTION !GFX !AVO PUSART_TXRDY
248 274
249 my $f = 0x85 | $NVRBIT; 275 my $f = 0x85 | $NVRBIT;
250 276
251 $f |= 0x02 unless $AVO; 277 $f |= 0x02 unless $AVO;
252 $f |= 0x40 if $LBA & 0x2; 278 $f |= 0x40 if $LBA6 & 0x2;
253 279
254 $f 280 $f
255} 281}
256 282
257sub in_82 { # tbmt keyboard uart 283sub in_82 { # tbmt keyboard uart
… …
259 285
260 $RST |= 1; 286 $RST |= 1;
261 shift @KXMIT 287 shift @KXMIT
262} 288}
263 289
264sub in_03 { 0xff } # unknown, printer uart input? 290sub in_03 { 0xff } # vt102 unknown, printer uart input?
265sub in_0b { 0xff } # unknown 291sub in_0b { 0xff } # vt102 unknown
266sub in_17 { 0xff } # unknown, printer status clear by reading? 292sub in_17 { 0xff } # vt102 unknown, printer status clear by reading?
267sub in_1b { 0xff } # unknown 293sub in_1b { 0xff } # vt102 unknown
268 294
269############################################################################# 295#############################################################################
296# 8085 cpu opcodes and flag handling
270 297
271sub sf { # set flags (ZSC - AP not implemented) 298sub sf { # set flags (ZSC - AP not implemented)
272 $FS = $_[0] & 0x080; 299 $FS = $_[0] & 0x080;
273 $FZ = ($_[0] & 0x0ff) == 0; 300 $FZ = !($_[0] & 0x0ff);
274 $FC = $_[0] & 0x100; 301 $FC = $_[0] & 0x100;
275 302
276 $_[0] & 0xff 303 $_[0] &= 0xff;
304}
305
306sub sf8 { # set flags (ZSC - AP not implemented)
307 $FS = $_[0] & 0x080;
308 $FZ = !($_[0] & 0x0ff);
309 $FC = 0;
277} 310}
278 311
279sub sf_nc { # set flags except carry 312sub sf_nc { # set flags except carry
280 $FS = $_[0] & 0x080; 313 $FS = $_[0] & 0x080;
281 $FZ = ($_[0] & 0x0ff) == 0; 314 $FZ = ($_[0] & 0x0ff) == 0;
282 315
283 $_[0] & 0xff 316 $_[0] &= 0xff;
284} 317}
285 318
286my @op = map { sprintf "status(); die 'unknown op %02x'", $_ } 0 .. 255; 319my @op = map { sprintf "status(); die 'unknown op %02x'", $_ } 0x00 .. 0xff;
287my @ops;
288 320
289my @reg = qw($B $C $D $E $H $L $M[$H*256+$L] $A); 321my @reg = qw($B $C $D $E $H $L $M[$H*256+$L] $A);
290my @cc = ('if !$FZ', 'if $FZ', 'if !$FC', 'if $FC', ';die', ';die', 'if !$FS', 'if $FS'); # die == unimplemented $FP parity 322my @cc = ('if !$FZ', 'if $FZ', 'if !$FC', 'if $FC', ';die', ';die', 'if !$FS', 'if $FS'); # die == unimplemented $FP parity
323
324$op[0x00] = '';
291 325
292# mov r,r / r,M / M,r 326# mov r,r / r,M / M,r
293for my $s (0..7) { 327for my $s (0..7) {
294 for my $d (0..7) { 328 for my $d (0..7) {
295 $op[0x40 + $d * 8 + $s] = "$reg[$d] = $reg[$s]"; 329 $op[0x40 + $d * 8 + $s] = "$reg[$d] = $reg[$s]"; # mov
296 } 330 }
297} 331}
298 332
299$op[0x00] = ''; 333$op[0x76] = 'die "HLT"'; # hlt (mov m,m)
334
335# mvi r / M
336$op[0x06 + $_ * 8] = "$reg[$_] = IMM8" for 0..7;
300 337
301$op[0x01] = '($B, $C) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi 338$op[0x01] = '($B, $C) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi
302$op[0x11] = '($D, $E) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi 339$op[0x11] = '($D, $E) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi
303$op[0x21] = '($H, $L) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi 340$op[0x21] = '($H, $L) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi
304$op[0x31] = '$SP = IMM16' ; # lxi #d# 0xf000 because of limited stack 341$op[0x31] = '$SP = IMM16' ; # lxi
305 342
306$op[0x02] = '$M[$B * 256 + $C] = $A'; # stax 343$op[0x02] = '$M[$B * 256 + $C] = $A'; # stax
307$op[0x12] = '$M[$D * 256 + $E] = $A'; # stax 344$op[0x12] = '$M[$D * 256 + $E] = $A'; # stax
308$op[0x32] = '$M[IMM16 ] = $A'; # sta 345$op[0x32] = '$M[IMM16 ] = $A'; # sta
309 346
347$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
310sub inxdcx($$$) { 354sub inxdcx($$$) {
311 $x = ($_[0] * 256 + $_[1] + $_[2]) & 0xffff; 355 $x = $_[0] * 256 + $_[1] + $_[2];
312 $_[0] = $x >> 8; 356 ($_[0], $_[1]) = (($x >> 8) & 0xff, $x & 0xff);
313 $_[1] = $x & 0xff;
314} 357}
315 358
316$op[0x03] = 'inxdcx $B, $C, 1'; # inx 359$op[0x03] = 'inxdcx $B, $C, 1'; # inx
317$op[0x13] = 'inxdcx $D, $E, 1'; # inx 360$op[0x13] = 'inxdcx $D, $E, 1'; # inx
318$op[0x23] = 'inxdcx $H, $L, 1'; # inx 361$op[0x23] = 'inxdcx $H, $L, 1'; # inx
… …
321$op[0x1b] = 'inxdcx $D, $E, -1'; # dcx 364$op[0x1b] = 'inxdcx $D, $E, -1'; # dcx
322$op[0x2b] = 'inxdcx $H, $L, -1'; # dcx 365$op[0x2b] = 'inxdcx $H, $L, -1'; # dcx
323$op[0x3b] = '--$SP' ; # dcx 366$op[0x3b] = '--$SP' ; # dcx
324 367
325# "no carry" doesn't seem to be needed for vt100 - optimize? 368# "no carry" doesn't seem to be needed for vt100 - optimize?
326$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[$_] = IMM8" for 0..7; 369$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
378$op[0x2f] = '$A ^= 0xff'; # cma
331 379
332# getting this insn wrong (its the only 16 bit insn to modify flags) 380# 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 381# wasted three of my best days with mindless vt102 rom reverse engineering
334sub dad { 382sub dad {
335 $x = $H * 256 + $L + $_[0]; 383 $x = $H * 256 + $L + $_[0];
… …
341$op[0x09] = 'dad $B * 256 + $C'; # dad 389$op[0x09] = 'dad $B * 256 + $C'; # dad
342$op[0x19] = 'dad $D * 256 + $E'; # dad 390$op[0x19] = 'dad $D * 256 + $E'; # dad
343$op[0x29] = 'dad $H * 256 + $L'; # dad 391$op[0x29] = 'dad $H * 256 + $L'; # dad
344$op[0x39] = 'dad $SP '; # dad 392$op[0x39] = 'dad $SP '; # dad
345 393
346$op[0x07] = ' $FC = $A >> 7; $A = ($A * 2 + $FC) & 0xff '; # rlc 394$op[0x80 + $_] = 'sf $A += + ' . $reg[$_] for 0..7; # add
347$op[0x17] = ' ($FC, $A) = ($A >> 7, ($A * 2 + $FC) & 0xff)'; # ral 395$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
348 403
349$op[0x0f] = ' $FC = $A & 1; $A = ($A >> 1) | ($FC && 0x80) '; # rrc 404$op[0xc6] = 'sf $A += IMM8'; # adi
350$op[0x1f] = ' ($FC, $A) = ($A & 1, ($A >> 1) | ($FC && 0x80))'; # rar 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 $A - IMM8'; # cpi
351 412
352$op[0x0a] = '$A = $M[$B * 256 + $C]'; # ldax b 413$op[0xc5] = 'PUSH $B; PUSH $C';
353$op[0x1a] = '$A = $M[$D * 256 + $E]'; # ldax d 414$op[0xd5] = 'PUSH $D; PUSH $E';
354$op[0x3a] = '$A = $M[IMM16]'; # lda 415$op[0xe5] = 'PUSH $H; PUSH $L';
416$op[0xf5] = 'PUSH $A; PUSH +($FS && 0x80) | ($FZ && 0x40) | ($FA && 0x10) | ($FP && 0x04) | ($FC && 0x01)'; # psw
417
418$op[0xc1] = '($C, $B) = (POP, POP)'; # pop
419$op[0xd1] = '($E, $D) = (POP, POP)'; # pop
420$op[0xe1] = '($L, $H) = (POP, POP)'; # pop
421$op[0xf1] = '($x, $A) = (POP, POP); ($FS, $FZ, $FA, $FP, $FC) = ($x & 0x80, $x & 0x40, $x & 0x10, $x & 0x04, $x & 0x01)'; # pop psw
422
423$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$op[0xcd] = '(PUSH PC >> 8), (PUSH PC & 0xff), (BRA IMM16)'; # call
428
429$op[0xc0 + $_ * 8] = 'BRA POP + POP * 256 ' . $cc[$_] for 0..7; # rcc
430$op[0xc9] = 'JMP POP + POP * 256'; # ret
431
432$op[0xc7 + $_ * 8] = "JMP $_ * 8" for 0..7; # rst
433
434$op[0xe9] = 'JMP $H * 256 + $L'; # pchl
435# f9 SPHL NYI
436
437$op[0x37] = '$FC = 1 '; # stc
438$op[0x3f] = '$FC = !$FC'; # cmc
439
440$op[0xd3] = 'OUT'; # out
441$op[0xdb] = 'IN'; # in
442
443$op[0xeb] = '($D, $E, $H, $L) = ($H, $L, $D, $E)'; # xchg
444
445# e3 xthl NYI # @ 917b, hl <-> (sp)
355 446
356$op[0x20] = '$A = $INTPEND * 16 + $INTMASK + ($IFF && 8)'; # rim (incomplete) 447$op[0x20] = '$A = $INTPEND * 16 + $INTMASK + ($IFF && 8)'; # rim (incomplete)
357$op[0x30] = '$INTMASK = $A & 7 if $A & 8'; # sim (incomplete) 448$op[0x30] = '$INTMASK = $A & 7 if $A & 8'; # sim (incomplete)
358 449
359$op[0x22] = '($M[IMM16], $M[IMM16 + 1]) = ($L, $H)'; # shld 450$op[0xf3] = '$IFF = 0'; # DI
360$op[0x2a] = '($L, $H) = ($M[IMM16], $M[IMM16 + 1])'; # lhld 451$op[0xfb] = '$IFF = 1'; # EI
361 452
362# yeah, the fucking setup screens actually use daa... 453# yeah, the fucking setup screens actually use daa...
363$op[0x27] = ' 454$op[0x27] = '
364 my ($h, $l); 455 my ($h, $l);
365 456
366 ($h, $l) = ($A >> 4, $A & 15); 457 ($h, $l) = ($A >> 4, $A & 15);
367 458
368 if ($l > 9 || $FA) { 459 if ($l > 9 || $FA) {
369 $A = sf $A + 6; 460 sf $A += 6;
370 ($h, $l) = ($A >> 4, $A & 15); 461 ($h, $l) = ($A >> 4, $A & 15);
371 } 462 }
372 463
373 if ($h > 9 || $FC) { 464 if ($h > 9 || $FC) {
374 $h += 6; 465 $h += 6;
375 $A = ($h * 16 + $l) & 0xff; 466 $A = ($h * 16 + $l) & 0xff;
376 } 467 }
377'; # daa, almost certainly borked, also, acarry not set by sf 468'; # daa, almost certainly borked, also, acarry not set by sf
378 469
379$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############################################################################# 470#############################################################################
471# print cpu status for debugging purposes
439 472
440# print cpu status, for debugging 473# print cpu status, for debugging
441sub status { 474sub status {
442 my $PC = shift || $PC; 475 my $PC = shift || $PC;
443 476
… …
447 ($FZ ? "1" : "0") 480 ($FZ ? "1" : "0")
448 . ($FS ? "1" : "0") 481 . ($FS ? "1" : "0")
449 . ($FC ? "1" : "0") 482 . ($FC ? "1" : "0")
450 . ($FA ? "1" : "0") 483 . ($FA ? "1" : "0")
451 . ($FP ? "1" : "0"), 484 . ($FP ? "1" : "0"),
452 $M[$PC], $ops[$M[$PC]]; 485 $M[$PC], $op[$M[$PC]];
453} 486}
454 487
455############################################################################# 488#############################################################################
489# video emulation
456 490
457my @chr = ( 491binmode STDOUT;
458 " ", 492
459 "\x{29eb}", 493my @CHARMAP = (
460 "\x{2592}", 494 " " , "\x{29eb}", "\x{2592}", "\x{2409}",
461 "\x{2409}", 495 "\x{240c}", "\x{240d}", "\x{240a}", "\x{00b0}",
462 "\x{240c}", 496 "\x{00b1}", "\x{2424}", "\x{240b}", "\x{2518}",
463 "\x{240d}", 497 "\x{2510}", "\x{250c}", "\x{2514}", "\x{253c}",
464 "\x{240a}", 498 "\x{23ba}", "\x{23bb}", "\x{2500}", "\x{23bc}",
465 "\x{00b0}", 499 "\x{23bd}", "\x{251c}", "\x{2524}", "\x{2534}",
466 "\x{00b1}", 500 "\x{252c}", "\x{2502}", "\x{2264}", "\x{2265}",
467 "\x{2424}", 501 "\x{03c0}", "\x{2260}", "\x{00a3}", "\x{00b7}",
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 "\x{00a3}",
489 "\x{00b7}",
490 (map chr, 0x020 .. 0x7e), 502 (map chr, 0x020 .. 0x7e),
491 "?",
492); 503);
493 504
494utf8::encode $_ for @chr; 505utf8::encode $_ for @CHARMAP;
495 506
496sub prscr { 507my @SGR; # sgr sequences for attributes
508
509for (0x00 .. 0xff) {
510 my $sgr = "";
511
512 # ~1 sgr 5 blink
513 # ~2 sgr 4 underline
514 # ~4 sgr 1 bold
515 # 0x80 in attr, sgr 7, reversed
516
517 $sgr .= ";5" unless $_ & 0x01;
518 $sgr .= ";4" unless $_ & 0x02;
519 $sgr .= ";1" unless $_ & 0x04;
520 $sgr .= ";7" if $_ & 0x80;
521
522 $SGR[$_] = "\e[${sgr}m";
523}
524
525my @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
530sub display {
497 my $i = 0x2000; 531 my $i = 0x2000;
498 532
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; 533 my $leds = join " ", map $KSTATUS & 2**$_ ? "\e[7m$LED[$_]\e[m" : "$LED[$_]", reverse 0 .. $#LED;
500 534
535 my $scr = sprintf "\e[H--- LED [ %s ] CLK %d\e[K\n", $leds, $CLK;
536
537 $scr .= "\e[?5" . ($DC11_REVERSE ? "h" : "l");
538
501 line: 539 line:
502 for my $y (0 .. 25) { 540 for my $y (0 .. 25) { # ntsc, two vblank delay lines, up to 24 text lines
541 my $prev_sgr;
542
503 $scr .= sprintf "%2d |", ++$y; 543 $scr .= sprintf "%2d \xe2\x94\x82", $y;
504 544
505 for (0..140) { 545 for (0..139) {
506 my $c = $M[$i++]; 546 my $c = $M[$i];
507
508# printf "%04x %02x\n", $i-1,$c;
509 547
510 if ($c == 0x7f) { # also 0xff, but the firmware avoids that 548 if ($c == 0x7f) { # also 0xff, but the firmware avoids that
511 $scr .= "|\x1b[K\n"; 549 $scr .= "\e[m\xe2\x94\x82\e[K\n";
512 550
513 my $a1 = $M[$i++]; 551 my $a1 = $M[$i + 1];
514 my $a0 = $M[$i++]; 552 my $a0 = $M[$i + 2];
515 553
516 $i = 0x2000 + (($a1 * 256 + $a0) & 0xfff); 554 $i = 0x2000 + (($a1 * 256 + $a0) & 0xfff);
517 555
518 next line; 556 next line;
519 } 557 }
520 558
521 $scr .= "\x1b[7m" if $c & 0x80; 559 my $sgr = $SGR[ ($M[$i++ + 0x1000] & 15) | ($c & 0x80)];
522 $scr .= $chr[$c & 0x7f] // sprintf "[%02x]", $c & 0x7f; 560
523 $scr .= "\x1b[m" if $c & 0x80; 561 $scr .= $prev_sgr = $sgr if $sgr ne $prev_sgr;
562
563 $scr .= $CHARMAP[$c & 0x7f];
524 } 564 }
525 565
526 $scr .= "\x1b[K\noverflow\x1b[K\n"; 566 $scr .= "\e[K\nvideo overflow\e[K\n";
527 last; 567 last;
528 } 568 }
529 569
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"; 570 $scr .= "\e[m\e[J";
542 571
543 syswrite STDOUT, $scr; 572 syswrite STDOUT, $scr;
544} 573}
545 574
546############################################################################# 575#############################################################################
576# keyboard handling
547 577
548if (@ARGV) { 578# 0x080 shift, 0x100 ctrl
549 require IO::Pty; 579my %KEYMAP = (
550 $PTY = IO::Pty->new; 580 "\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);
551 613
552 my $slave = $PTY->slave; 614@KEYMAP{map chr, 0x20 .. 0x40, 0x5b .. 0x7e} = unpack "C*", pack "H*",
615 "779ad5a9a8b8a755a6b5b6b466256575" . "351a3929283837273626d656e634e5f5" . "b9" # 20..40
616 . "154514b7a5" . "244a6879591949485816574746766706" . "050a185a0817780969077a95c594a4"; # 5b..7e
553 617
554 $PTY->set_winsize (24, 80); 618$KEYMAP{"\x1f" & $_} ||= $KEYMAP{$_} | 0x100 for "a" .. "z"; # ctrl
619$KEYMAP{"\x20" ^ $_} ||= $KEYMAP{$_} | 0x080 for "a" .. "z"; # shift
555 620
556 unless (fork) { 621my $KEYMATCH = join "|", map quotemeta, reverse sort keys %KEYMAP;
557 $ENV{TERM} = $VT102 ? "vt102" : "vt100"; 622$KEYMATCH = qr{^($KEYMATCH)}s;
558 623
559 close $PTY; 624my %KMOD;
560 625
561 open STDIN , "<&", $slave; 626sub key {
562 open STDOUT, ">&", $slave; 627 my ($key) = @_;
563 open STDERR, ">&", $slave;
564 628
565 system "stty ixoff erase ^H"; 629 push @KQUEUE, -0x7c if !($key & 0x100) && delete $KMOD{0x7c}; # ctrl-up
630 push @KQUEUE, -0x7d if !($key & 0x080) && delete $KMOD{0x7d}; # shift-up
566 631
567 $PTY->make_slave_controlling_terminal; 632 push @KQUEUE, 0x7c if $key & 0x100 && !$KMOD{0x7c}++; # ctrl-down
568 $PTY->close_slave; 633 push @KQUEUE, 0x7d if $key & 0x080 && !$KMOD{0x7d}++; # shift-down
569 634
570 exec @ARGV; 635 $key &= 0x7f;
571 } 636 push @KQUEUE, $key, -$key;
572
573 $PTY->close_slave;
574
575} else {
576 open $PTY, "</dev/null" or die;#d
577} 637}
578 638
579############################################################################# 639my $STDIN_BUF;
580 640
641sub stdin_parse {
642 key $KEYMAP{$1}
643 while $STDIN_BUF =~ s/$KEYMATCH//;
644
645 # skip input we can't decipher
646 substr $STDIN_BUF, 0, 1, "";
647}
648
649if ($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} = $SIG{QUIT} = sub { exit 1 };
653}
654
655#############################################################################
581# initial key input, to set up online mode etc. 656# initial key input, to set up online mode etc.
657# could be done via nvram defaults
658
582@KQUEUE = ( 659@KQUEUE = (
583 0x7b, -0x7b, # setup 660 0x7b, -0x7b, # setup
584 0, # delay 661 0, # delay
585 0x28, -0x28, # 4, toggle local/online 662 0x28, -0x28, # 4, toggle local/online
586 0x38, -0x38, # 5, setup b 663 0x38, -0x38, # 5, setup b
… …
597 0x37, -0x37, # 6 toggle wrap around 674 0x37, -0x37, # 6 toggle wrap around
598 0x7b, -0x7b, # leave setup 675 0x7b, -0x7b, # leave setup
599); 676);
600 677
601############################################################################# 678#############################################################################
679# process/pty management
602 680
603# 0x80 shift, 0x100 ctrl, 0x200 toggle 681require IO::Pty;
604my %KEYMAP = ( 682$PTY = IO::Pty->new;
605 "\t" => 0x3a,
606 "\r" => 0x64,
607 "\n" => 0x44,
608 683
609 # hardcoded rxvt keys 684my $slave = $PTY->slave;
610 "\e" => 0x2a, # ESC
611 "\e[3~" => 0x03, # DC
612 "\e[5~" => 0x7e, # CAPS LOCK (prior)
613 "\e[6~" => 0x6a, # NO SCROLL (next)
614 "\e[A" => 0x30, # UP
615 "\e[B" => 0x22, # DOWN
616 "\e[C" => 0x10, # RIGHT
617 "\e[D" => 0x20, # LEFT
618 "\e[a" => 0x30 | 0x080, # UP
619 "\e[b" => 0x22 | 0x080, # DOWN
620 "\e[c" => 0x10 | 0x080, # RIGHT
621 "\e[d" => 0x20 | 0x080, # LEFT
622 "\e[7~" => 0x7b, # SETUP (home)
623 "\e[8~" => 0x23, # BREAK (end)
624 "\e[8\$" => 0x23 | 0x080, # SHIFT BREAK / DISCONNECT (shift-end)
625 "\x7f" => 0x33, # BACKSPACE
626 685
627 "\e[11~" => 0x32, # F1 686$PTY->set_winsize (24, 80);
628 "\e[11~" => 0x42, # F2
629 "\e[11~" => 0x31, # F3
630 "\e[11~" => 0x41, # F4
631);
632 687
633@KEYMAP{map chr, 0x20..0x40} = unpack "C*", pack "H*", 688unless (fork) {
634 "779ad5a9a8b8a755a6b5b6b466256575" . "351a3929283837273626d656e634e5f5" . "b9"; 689 $ENV{TERM} = $VT102 ? "vt102" : "vt100";
635 690
636@KEYMAP{map chr, 0x5b .. 0x7e} = unpack "C*", pack "H*", 691 close $PTY;
637 "154514b7a5" . "244a6879591949485816574746766706" . "050a185a0817780969077a95c594a4";
638 692
639$KEYMAP{"\x3f" & $_} ||= $KEYMAP{$_} | 0x100 for "a" .. "z"; # ctrl 693 open STDIN , "<&", $slave;
640$KEYMAP{uc $_} ||= $KEYMAP{$_} | 0x080 for "a" .. "z"; # shift 694 open STDOUT, ">&", $slave;
695 open STDERR, ">&", $slave;
641 696
642my $KEYMATCH = join "|", map quotemeta, reverse sort keys %KEYMAP; 697 system "stty ixoff erase ^H";
643$KEYMATCH = qr{^($KEYMATCH)}s;
644 698
645sub key { 699 $PTY->make_slave_controlling_terminal;
646 my ($key) = @_; 700 $PTY->close_slave;
647 701
648 state %MOD; 702 @ARGV = "sh" unless @ARGV;
649 703 exec @ARGV;
650 push @KQUEUE, -0x7c if !($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} 704}
659 705
660my $STDIN_BUF; 706$PTY->close_slave;
661 707
662sub stdin_parse {
663 key $KEYMAP{$1}
664 while $STDIN_BUF =~ s/$KEYMATCH//;
665
666 # skip input we can't decipher
667 substr $STDIN_BUF, 0, 1, "";
668}
669
670if ($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############################################################################# 708#############################################################################
709# the actual hardware simulator
677 710
678my @ICACHE; # compiled instruction cache 711my @ICACHE; # compiled instruction cache
679 712
680# the cpu
681while () { 713while () {
682
683 # execute extended basic blocks 714 # execute extended basic blocks
684 $PC = ($ICACHE[$PC] ||= do { 715 $PC = ($ICACHE[$PC] ||= do {
685 my $pc = $PC; 716 my $pc = $PC;
686 717
687 my $insn = ""; 718 my $insn = "";
688 719
689 # the jit compiler 720 # the jit compiler
690 for (0..15) { 721 for (0..31) {
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; 722 my $imm;
703 my $op = $op[$M[$pc++]]; 723 my $op = $op[$M[$pc++]];
704 724
705 for ($op) { 725 for ($op) {
706 s/\bPUSH\b/\$M[--\$SP] =/g; # push byte to stack 726 s/\bPUSH\b/\$M[--\$SP] =/g; # push byte to stack
… …
719 739
720 $insn .= "$op;\n"; 740 $insn .= "$op;\n";
721 } 741 }
722 742
723 743
724 $insn .= "$pc"; 744 $insn .= $pc;
725 $insn =~ s/\x00.*$//s; 745 $insn =~ s/\x00.*$//s;
726 746
727 eval "use integer; sub { $insn }" or die "$insn: $@" 747 eval "use integer; sub { $insn }" or die "$insn: $@"
728 })->(); 748 })->();
729 749
730 ++$CLK; 750 ++$CLK;
731 751
732 #TODO: just check on ret instructions or so 752 # things we do from time too time only
753 unless ($CLK & 0xf) {
754 # do I/O
755
756 unless ($CLK & 0xfff) {
757
758 # pty/serial I/O
759 unless ((@PUSARTRECV >= 128) || @KQUEUE || !$PTY) {
760 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 $RST |= 2 if @PUSARTRECV && $XON; # VT100, but works on vt102, too (probably not used on real hardware though)
782 #$INTPEND |= 2 if @PUSARTRECV && $XON; # VT102, 6.5 rxrdy
783
784 # kick off vertical retrace form time to time
785 unless ($CLK & 0x1ff) {
786 $RST |= 4; # vertical retrace
787 }
788
789 # handle video hardware
790 unless ($CLK & 0x3fff) {
791 display;
792 }
793 }
794
733 # the interrupt logic 795 # the interrupt logic
734 $x = $INTPEND & ~$INTMASK; 796 if (($RST || ($INTPEND & ~$INTMASK)) && $IFF) {
735
736 if (($RST || $x) && $IFF) {
737 # rst 1 kbd data available 797 # rst 1 kbd data available
738 # rst 2 pusart xmit+recv flag 798 # rst 2 pusart xmit+recv flag
739 # rst 4 vertical retrace 799 # rst 4 vertical retrace
740 # 5.5 vt125 mb7 trans ready (serial send?) 800 # 5.5 vt125 mb7 trans ready (serial send?)
741 # 6.5 vt125 mb7 read ready (something modem?) 801 # 6.5 vt125 mb7 read ready (something modem?)
742 # 7.5 vt125 mb7 vblank h(?) 802 # 7.5 vt125 mb7 vblank h(?)
743 # trap vt125 mbi init h(?) 803 # trap vt125 mbi init h(?)
744 my $vec; 804 my $vec;
745 805
806 $x = $INTPEND & ~$INTMASK;
807
746 if ($x & 1) { $vec = 0x2c; $INTPEND &= ~1; 808 if ($x & 1) { $vec = 0x2c; $INTPEND &= ~1;
747 } elsif ($x & 2) { $vec = 0x34; $INTPEND &= ~2; 809 } elsif ($x & 2) { $vec = 0x34; $INTPEND &= ~2;
748 } elsif ($x & 4) { $vec = 0x3c; $INTPEND &= ~4; 810 } elsif ($x & 4) { $vec = 0x3c; $INTPEND &= ~4;
749# } elsif ($RST ) { $vec = $RST * 8; $RST = 0; # for some reason, this breaks vt102 811# } elsif ($RST ) { $vec = $RST * 8; $RST = 0; # the vt102 firmware doesn't like combined interrupts
750 } elsif ($RST & 1) { $vec = 0x08; $RST &= ~1; # separate is better for vt102 812 } elsif ($RST & 1) { $vec = 0x08; $RST &= ~1; # separate is better for vt102
751 } elsif ($RST & 2) { $vec = 0x10; $RST &= ~2; 813 } elsif ($RST & 2) { $vec = 0x10; $RST &= ~2;
752 } elsif ($RST & 4) { $vec = 0x20; $RST &= ~4; 814 } elsif ($RST & 4) { $vec = 0x20; $RST &= ~4;
753 } else { 815 } else {
754 die; 816 die;
… …
758 $M[--$SP] = $PC & 0xff; 820 $M[--$SP] = $PC & 0xff;
759 $PC = $vec; 821 $PC = $vec;
760 822
761 $IFF = 0; 823 $IFF = 0;
762 } 824 }
763
764 # things we do from time too time only
765 unless ($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 $RST |= 2 if @PUSARTRECV && $XON; # VT100, but works on vt102, too (probably not used on real hardware though)
794 #$INTPEND |= 2 if @PUSARTRECV && $XON; # VT102, 6.5 rxrdy
795
796 # kick off vertical retrace form time to time
797 unless ($CLK & 0x3ff) {
798 $RST |= 4; # vertical retrace
799 }
800
801 # handle video hardware
802
803 unless ($CLK & 0x1fff) {
804 prscr;
805 }
806 }
807} 825}
826
827#############################################################################
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# vt102 @ 0x0000+0x2000 23-226E4
836# vt102 @ 0x8000+0x2000 23-225E4
837#
838# vt131 @ 0xa000+0x0800 23-280E2
839#
808 840
809__DATA__ 841__DATA__
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812! ͋!2[ 2v!!"I!>2s >2 B>2y >2!2!&l" >@:X!:!͔>2!b:!K>G:| !p ^!p" :!x:! u> 844! ͋!2[ 2v!!"I!>2s >2 B>2y >2!2!&l" >@:X!:!͔>2!b:!K>G:| !p ^!p" :!x:! u>
… …
916 948
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918\lkgfa';jhds .,nbx* :B!4 950\lkgfa';jhds .,nbx* :B!4
919!O!,ͳʄmÝ 951!O!,ͳʄmÝ
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955"C*C!(0:!@W ==}wï2C!2D!z5*b Q!{!| gH:d G| gW]>6#k<|eoozW>Ê

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