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Comparing vt102/vt102 (file contents):
Revision 1.8 by root, Mon Dec 1 20:04:11 2014 UTC vs.
Revision 1.27 by root, Fri Dec 5 05:41:11 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 5.010;
21# ./vt102 bash 21use strict;
22# ./vt102 telnet towel.blinkenlights.nl 22use integer;
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 key map
27
28use common::sense; 23#use common::sense;
29
30$| = 1;
31 24
32my $VT102 = 1; 25my $VT102 = 1;
33my $AVO = $VT102 || 1; 26my $VT131 = 0;
27my $AVO = 1;
28
29shift, ($VT102 = 0), ($AVO = 0) if $ARGV[0] =~ /^-?-vt100$/;
30shift, ($VT102 = 0) if $ARGV[0] =~ /^-?-vt100\+avo$/;
31shift if $ARGV[0] =~ /^-?-vt102$/;
32shift, ($VT131 = 1) if $ARGV[0] =~ /^-?-vt131$/;
33
34# vt100 wps = word processing roms
35# vt101 = vt102 - avo, but custom rom? really?
36# vt103 = vt100 + tu58 tape drive
37# vt125 = vt100 + gpo graphics processor
38# vt132 = vt100 + avo, stp
39# vt180 = vt100 + z80 cp/m
40
41if ($ARGV[0] =~ /^-/) {
42 die <<EOF;
43
44VT102, A VT100/102/131 SIMULATOR
45
46Usage:
47
48 $0 [option] [program [args]]
49
50Examples:
51
52 $0 bash
53 $0 telnet towel.blinkenlights.nl
54 $0 curl http://artscene.textfiles.com/vt100/trekvid.vt
55 $0 curl http://artscene.textfiles.com/vt100/surf.vt # in 3d!
56
57Option can be one of:
58
59 --vt100
60 --vt100+avo
61 --vt102
62 --vt131
63
64Non-obvious special keys are:
65
66 SET UP Home
67 BACKSPACE Rubout
68 CAPS LOCK Prior/PgUp
69 NO SCROLL Next/PgDown
70 BREAK End
71
72Set-Up Guide:
73
74 http://vt100.net/docs/vt102-ug/chapter3.html#S3.6
75
76Author:
77
78 Marc Lehmann <vt102\@schmorp.de>
79
80EOF
81}
82
83#############################################################################
84# ROM/hardware init
85
86my $PTY; # the pty we allocated, if any
34my $KBD = 1; 87my $KBD = 1;
35 88
36#############################################################################
37# rom initialising
38
39my $ROM = do { 89my $ROMS = do {
40 binmode DATA; 90 binmode DATA;
41 local $/; 91 local $/;
42 <DATA> 92 <DATA>
43}; 93};
44 94
450x6001 == length $ROM or die "corrupted rom image"; 950x6801 == length $ROMS or die "corrupted rom image";
46
47binmode STDOUT;
48 96
49my @M = (0xff) x 65536; # main memory, = (0xff) x 65536; 97my @M = (0xff) x 65536; # main memory, = (0xff) x 65536;
50 98
51# populate mem with rom contents 99# populate mem with rom contents
52if ($VT102) { 100if ($VT102) {
53 @M[0x0000 .. 0x1fff] = unpack "C*", substr $ROM, 0x2000, 0x2000; 101 @M[0x0000 .. 0x1fff] = unpack "C*", substr $ROMS, 0x2000, 0x2000;
54 @M[0x8000 .. 0x9fff] = unpack "C*", substr $ROM, 0x4000, 0x2000; 102 @M[0x8000 .. 0x9fff] = unpack "C*", substr $ROMS, 0x4000, 0x2000;
103 @M[0xa000 .. 0xa7ff] = unpack "C*", substr $ROMS, 0x6000, 0x0800 if $VT131;
55} else { 104} else {
56 @M[0x0000 .. 0x1fff] = unpack "C*", substr $ROM, 0x0000, 0x2000; 105 @M[0x0000 .. 0x1fff] = unpack "C*", substr $ROMS, 0x0000, 0x2000;
57} 106}
58 107
59############################################################################# 108#############################################################################
60# cpu registers and I/O support 109# 8085 CPU registers and I/O support
61
62my $PTY; # the pty we allocated, if any
63my $PRSTATUS = 0;
64 110
65# 8080/8085 registers 111# 8080/8085 registers
66# b, c, d, e, h, l, a 112my ($A, $B, $C, $D, $E, $H, $L); # 8 bit general purpose
67my ($A, $B, $C, $D, $E, $H, $L, $A); 113my ($PC, $SP, $IFF); # program counter, stack pointer, interrupt flag
68my ($PC, $SP, $IFF, $FA, $FZ, $FS, $FP, $FC); 114my ($FA, $FZ, $FS, $FP, $FC); # condition codes (psw)
69 115
70my $RST = 0; # 8080 pending interrupts 116my $RST = 0; # pending interrupts (external interrupt logic)
71my $INTMASK = 7; # 8085 half interrupts 117my $INTMASK = 7; # 8085 half interrupt mask
72my $INTPEND = 0; # 8085 half interrupts 118my $INTPEND = 0; # 8085 half interrupts pending
73 119
74my $x; # dummy temp for instructions 120my $CLK; # rather inexact clock, counts extended basic blocks
75 121
76my $CLK; # rather inexact clock
77
78############################################################################# 122#############################################################################
79# the dreaded nvr1400 chip. not needed to get it going, but provided for reference 123# the dreaded NVR1400 chip. not needed to get it going, but provided anyway
80 124
81# nvram 125# nvram
82my @NVR = (0x3fff) x 100; # vt102: 214e accum, 214f only lower 8 bit used, first 44 bytes 126my @NVR = (0x3fff) x 100; # vt102: 214e accum, 214f only lower 8 bit used, first 44 bytes
83my $NVRADDR; 127my $NVRADDR;
84my $NVRDATA; 128my $NVRDATA;
… …
93 sub { $NVR[$_[0]] = 0x3fff; }, # 5 erase 137 sub { $NVR[$_[0]] = 0x3fff; }, # 5 erase
94 sub { $NVRDATA = $NVR[$_[0]]; }, # 6 read 138 sub { $NVRDATA = $NVR[$_[0]]; }, # 6 read
95 sub { }, # 7 standby 139 sub { }, # 7 standby
96); 140);
97 141
98my @bitidx; 142my @NVR_BITIDX; $NVR_BITIDX[1 << $_] = 9 - $_ for 0..9;
99$bitidx[1 << $_] = 9 - $_ for 0..9;
100 143
101# the nvr1400 state machine. what a monster 144# the nvr1400 state machine. what a monster
102sub nvr() { 145sub nvr() {
103 my $a1 = $bitidx[(~$NVRADDR ) & 0x3ff]; 146 my $a1 = $NVR_BITIDX[(~$NVRADDR ) & 0x3ff];
104 my $a0 = $bitidx[(~$NVRADDR >> 10) & 0x3ff]; 147 my $a0 = $NVR_BITIDX[(~$NVRADDR >> 10) & 0x3ff];
105
106# printf "NVR %02x A %020b %d %d D %02x\n", $NVRLATCH, $NVRADDR & 0xfffff, $a1, $a0, $NVRDATA;
107 148
108 $NVRCMD[($NVRLATCH >> 1) & 7]($a1 * 10 + $a0, $NVRLATCH & 1) 149 $NVRCMD[($NVRLATCH >> 1) & 7]($a1 * 10 + $a0, $NVRLATCH & 1)
109} 150}
110 151
111############################################################################# 152#############################################################################
153# I/O ports - output
112 154
113my $DC11_REVERSE = 0; 155my $DC11_REVERSE = 0; # light background?
114 156
115my $XON = 1; # false if terminal wants us to pause 157my $XON = 1; # false if terminal wants us to pause
116my $PUSARTCMD; 158my $PUSARTCMD;
117 159
160my $KSTATUS; # keyboard status (click + scan flag + leds)
118my @KXMIT; # current scan queue 161my @KXMIT; # current scan queue
119my %KXMIT; # currently pressed keys 162my %KXMIT; # currently pressed keys
120my @KQUEUE; # key event queue 163my @KQUEUE; # key event queue
121my $KXCNT; # count for debouncew 164my $KXCNT; # count for debouncew
122my @PUSARTRECV; 165
123my $KSTATUS; 166my @PUSARTRECV; # serial input (to terminal) queue
124 167
125sub out_00 { # pusartdata 168sub out_00 { # pusartdata
126 # handle xon/xoff, but also pass it through 169 # handle xon/xoff, but also pass it through
127 if ($_[0] == 0x13) { 170 if ($_[0] == 0x13) {
128 $XON = 0; 171 $XON = 0;
… …
135 syswrite $PTY, chr $_[0]; 178 syswrite $PTY, chr $_[0];
136 179
137 $INTPEND |= 1; 180 $INTPEND |= 1;
138} 181}
139 182
140sub out_01 { 183sub out_01 { # pusartcmd
141 $PUSARTCMD = shift; 184 $PUSARTCMD = shift;
142 185
143 $INTPEND |= 1 if $PUSARTCMD & 0x01; # VT102, 5.5 txrdy 186 $INTPEND |= 1 if $PUSARTCMD & 0x01; # VT102, 5.5 txrdy
144 $INTPEND |= 2 if $PUSARTCMD & 0x04 && !@PUSARTRECV; # VT102, 6.5 rxrdy, needed for some reason 187 $INTPEND |= 2 if $PUSARTCMD & 0x04 && !@PUSARTRECV; # VT102, 6.5 rxrdy, needed for some reason
145} 188}
146 189
147sub out_02 { } # baudrate generator 190sub out_02 { } # baudrate generator
148 191
149sub out_23 { } # unknown 192sub out_23 { } # vt102 unknown
150sub out_27 { } # unknown 193sub out_27 { } # vt102 unknown
151sub out_2f { } # unknown, connected to in 0f 194sub out_2f { } # vt102 unknown, connected to in 0f
152 195
153sub out_42 { } # brightness 196sub out_42 { } # brightness
154 197
155sub out_62 { 198sub out_62 { # nvr latch register (4 bits)
156 $NVRLATCH = shift; 199 $NVRLATCH = shift;
157} 200}
158 201
159sub out_a2 { 202sub out_a2 { # device control 011
160 my $dc11 = 0x0f & shift; 203 my $dc11 = 0x0f & shift;
161 204
162 $DC11_REVERSE = 1 if $dc11 == 0b1010; 205 $DC11_REVERSE = 1 if $dc11 == 0b1010;
163 $DC11_REVERSE = 0 if $dc11 == 0b1011; 206 $DC11_REVERSE = 0 if $dc11 == 0b1011;
164} 207}
165 208
166sub out_c2 { } # unknown 209sub out_c2 { } # unknown
167sub out_d2 { } # 0..3 == 80c/132c/60hz/50hz 210sub out_d2 { } # device control 012, 0..3 == 80c/132c/60hz/50hz
168 211
169sub out_82 { 212sub out_82 { # keyboard txmit
170 # keyboard 213 # CLICK STARTSCAN ONLINE LOCKED | L1 L2 L3 L4 (vt100)
171
172 # CLICK STARTSCAN ONLINE LOCKED | CTS DSR INSERT L1(?) 214 # CLICK STARTSCAN ONLINE LOCKED | CTS DSR INS L1 (vt102)
173 # CLICK STARTSCAN ONLINE LOCKED | LED1 LED2 LED3 LED4
174 $KSTATUS = $_[0]; 215 $KSTATUS = $_[0];
175 216
176 # start new scan unless scan in progress 217 # start new scan unless scan is in progress
177 if (($_[0] & 0x40) && !@KXMIT) { 218 if (($_[0] & 0x40) && !@KXMIT) {
178 # do not reply with keys in locked mode 219 # do not reply with keys in locked mode
179 # or during post (0xff), 220 # or during post (0xff),
180 # mostly to skip init and not fail POST, 221 # mostly to skip init and not fail POST,
181 # and to send startup keys only when terminal is ready 222 # and to send startup keys only when terminal is ready
… …
201 $RST |= 1; 242 $RST |= 1;
202 } 243 }
203} 244}
204 245
205############################################################################# 246#############################################################################
247# I/O ports - input
206 248
207my $NVRBIT; 249my $NVRBIT; # the current nvr data bit
208my $LBA; 250my $LBA6; # twice the frequenxy of LBA7
209 251
210sub in_00 { # pusart data 252sub in_00 { # pusart data
211 # interrupt not generated here, because infinite 253 # interrupt not generated here, because infinite
212 # speed does not go well with the vt102. 254 # speed does not go well with the vt102.
213 255
… …
217sub in_01 { # pusart status 259sub in_01 { # pusart status
218 # DSR SYNDET FE OE | PE TXEMPTY RXRDY TXRDY 260 # DSR SYNDET FE OE | PE TXEMPTY RXRDY TXRDY
219 0x85 + (@PUSARTRECV && 0x02) 261 0x85 + (@PUSARTRECV && 0x02)
220} 262}
221 263
222sub in_22 { # modem buffer(?) 264sub in_22 { # modem buffer
223 # wild guess: -CTS -SPDI -RI -CD 0 0 0 0 265 # wild guess: -CTS -SPDI -RI -CD 0 0 0 0
224 0x20 266 0x20
225} 267}
226 268
227sub in_0f { } # unknown, connected to out 2f 269sub in_0f { 0xff } # vt102 unknown, connected to out 2f
228 270
229sub in_42 { # flag buffer 271sub in_42 { # flag buffer
230 ++$LBA; 272 ++$LBA6;
231 273
232 $NVRBIT = nvr ? 0x20 : 0x00 if ($LBA & 0x3) == 0x2; 274 $NVRBIT = nvr ? 0x20 : 0x00 if ($LBA6 & 0x3) == 0x2;
233 275
234 # KBD_XMITEMPTY LBA7 NVRDATA ODDFIELD - OPTION !GFX !AVO PUSART_TXRDY 276 # KBD_XMITEMPTY LBA7 NVRDATA ODDFIELD - OPTION !GFX !AVO PUSART_TXRDY
235 277
236 my $f = 0x85 | $NVRBIT; 278 my $f = 0x85 | $NVRBIT;
237 279
238 $f |= 0x02 unless $AVO; 280 $f |= 0x02 unless $AVO;
239 $f |= 0x40 if $LBA & 0x2; 281 $f |= 0x40 if $LBA6 & 0x2;
240 282
241 $f 283 $f
242} 284}
243 285
244sub in_82 { # tbmt keyboard uart 286sub in_82 { # tbmt keyboard uart
… …
246 288
247 $RST |= 1; 289 $RST |= 1;
248 shift @KXMIT 290 shift @KXMIT
249} 291}
250 292
251sub in_03 { 0xff } # unknown, printer uart input? 293sub in_03 { 0xff } # vt102 unknown, printer uart input?
252sub in_0b { 0xff } # unknown 294sub in_0b { 0xff } # vt102 unknown
253sub in_17 { 0xff } # unknown, printer status clear by reading? 295sub in_17 { 0xff } # vt102 unknown, printer status clear by reading?
254sub in_1b { 0xff } # unknown 296sub in_1b { 0xff } # vt102 unknown
255 297
256############################################################################# 298#############################################################################
299# 8085 cpu opcodes and flag handling
257 300
301my $x; # dummy scratchpad for opcodes
302
258sub sf { # set flags (ZSC - AP not implemented) 303sub sf { # set flags, full version (ZSC - AP not implemented)
304 $FS = $_[0] & 0x080;
305 $FZ = !($_[0] & 0x0ff);
306 $FC = $_[0] & 0x100;
307
308 $_[0] &= 0xff;
309}
310
311sub sf8 { # set flags, for 8-bit results (ZSC - AP not implemented)
312 $FS = $_[0] & 0x080;
313 $FZ = !($_[0] & 0x0ff);
314 $FC = 0;
315}
316
317sub sf_nc { # set flags, except carry
259 $FS = $_[0] & 0x080; 318 $FS = $_[0] & 0x080;
260 $FZ = ($_[0] & 0x0ff) == 0; 319 $FZ = ($_[0] & 0x0ff) == 0;
261 $FC = $_[0] & 0x100;
262 320
263 $_[0] & 0xff 321 $_[0] &= 0xff;
264} 322}
265 323
266sub sf_nc { # set flags except carry 324# opcode table
267 $FS = $_[0] & 0x080;
268 $FZ = ($_[0] & 0x0ff) == 0;
269
270 $_[0] & 0xff
271}
272
273my @op = map { sprintf "status(); die 'unknown op %02x'", $_ } 0 .. 255; 325my @op = map { sprintf "status(); die 'unknown op %02x'", $_ } 0x00 .. 0xff;
274my @ops;
275 326
276my @reg = qw($B $C $D $E $H $L $M[$H*256+$L] $A); 327my @reg = qw($B $C $D $E $H $L $M[$H*256+$L] $A); # r/m encoding
277my @cc = ('if !$FZ', 'if $FZ', 'if !$FC', 'if $FC', ';die', ';die', 'if !$FS', 'if $FS'); # die == unimplemented $FP parity 328my @cc = ('!$FZ', '$FZ', '!$FC', '$FC', 'die;', 'die;', '!$FS', '$FS'); # cc encoding. die == unimplemented $FP parity
329
330$op[0x00] = ''; # nop
278 331
279# mov r,r / r,M / M,r 332# mov r,r / r,M / M,r
280for my $s (0..7) { 333for my $s (0..7) {
281 for my $d (0..7) { 334 for my $d (0..7) {
282 $op[0x40 + $d * 8 + $s] = "$reg[$d] = $reg[$s]"; 335 $op[0x40 + $d * 8 + $s] = "$reg[$d] = $reg[$s]"; # mov
283 } 336 }
284} 337}
285 338
286$op[0x00] = ''; 339$op[0x76] = 'die "HLT"'; # hlt (mov m,m)
340
341# mvi r / M
342$op[0x06 + $_ * 8] = "$reg[$_] = IMM8" for 0..7;
287 343
288$op[0x01] = '($B, $C) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi 344$op[0x01] = '($B, $C) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi
289$op[0x11] = '($D, $E) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi 345$op[0x11] = '($D, $E) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi
290$op[0x21] = '($H, $L) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi 346$op[0x21] = '($H, $L) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi
291$op[0x31] = '$SP = IMM16' ; # lxi #d# 0xf000 because of limited stack 347$op[0x31] = '$SP = IMM16' ; # lxi
292 348
293$op[0x02] = '$M[$B * 256 + $C] = $A'; # stax 349$op[0x02] = '$M[$B * 256 + $C] = $A'; # stax
294$op[0x12] = '$M[$D * 256 + $E] = $A'; # stax 350$op[0x12] = '$M[$D * 256 + $E] = $A'; # stax
295$op[0x32] = '$M[IMM16 ] = $A'; # sta 351$op[0x32] = '$M[IMM16 ] = $A'; # sta
296 352
353$op[0x0a] = '$A = $M[$B * 256 + $C]'; # ldax b
354$op[0x1a] = '$A = $M[$D * 256 + $E]'; # ldax d
355$op[0x3a] = '$A = $M[IMM16]'; # lda
356
357$op[0x22] = '($M[IMM16], $M[IMM16 + 1]) = ($L, $H)'; # shld
358$op[0x2a] = '($L, $H) = ($M[IMM16], $M[IMM16 + 1])'; # lhld
359
297sub inxdcx($$$) { 360sub inxdcx($$$) {
298 $x = ($_[0] * 256 + $_[1] + $_[2]) & 0xffff; 361 $x = $_[0] * 256 + $_[1] + $_[2];
299 $_[0] = $x >> 8; 362 ($_[0], $_[1]) = (($x >> 8) & 0xff, $x & 0xff);
300 $_[1] = $x & 0xff;
301} 363}
302 364
303$op[0x03] = 'inxdcx $B, $C, 1'; # inx 365$op[0x03] = 'inxdcx $B, $C, 1'; # inx
304$op[0x13] = 'inxdcx $D, $E, 1'; # inx 366$op[0x13] = 'inxdcx $D, $E, 1'; # inx
305$op[0x23] = 'inxdcx $H, $L, 1'; # inx 367$op[0x23] = 'inxdcx $H, $L, 1'; # inx
… …
308$op[0x1b] = 'inxdcx $D, $E, -1'; # dcx 370$op[0x1b] = 'inxdcx $D, $E, -1'; # dcx
309$op[0x2b] = 'inxdcx $H, $L, -1'; # dcx 371$op[0x2b] = 'inxdcx $H, $L, -1'; # dcx
310$op[0x3b] = '--$SP' ; # dcx 372$op[0x3b] = '--$SP' ; # dcx
311 373
312# "no carry" doesn't seem to be needed for vt100 - optimize? 374# "no carry" doesn't seem to be needed for vt100 - optimize?
313$op[0x04 + $_ * 8] = "$reg[$_] = sf_nc $reg[$_] + 1" for 0..7; # inr
314$op[0x05 + $_ * 8] = "$reg[$_] = sf_nc $reg[$_] - 1" for 0..7; # dcr
315
316# mvi r / M
317$op[0x06 + $_ * 8] = "$reg[$_] = IMM8" for 0..7; 375$op[0x04 + $_ * 8] = "sf_nc ++$reg[$_]" for 0..7; # inr
376$op[0x05 + $_ * 8] = "sf_nc --$reg[$_]" for 0..7; # dcr
377
378$op[0x07] = ' $FC = $A & 0x80; $A = (($A << 1) + ($FC && 0x01)) & 0xff '; # rlc
379$op[0x17] = ' ($FC, $A) = ($A & 0x80, (($A << 1) + ($FC && 0x01)) & 0xff)'; # ral
380$op[0x0f] = ' $FC = $A & 0x01; $A = ($A >> 1) | ($FC && 0x80) '; # rrc
381$op[0x1f] = ' ($FC, $A) = ($A & 0x01, ($A >> 1) | ($FC && 0x80))'; # rar
318 382
319# getting this insn wrong (its the only 16 bit insn to modify flags) 383# getting this insn wrong (its the only 16 bit insn to modify flags)
320# wasted three of my best days with mindless vt102 rom reverse engineering 384# wasted three of my best days with mindless vt102 rom reverse engineering
321sub dad { 385sub dad {
322 $x = $H * 256 + $L + $_[0]; 386 $x = $H * 256 + $L + $_[0];
… …
328$op[0x09] = 'dad $B * 256 + $C'; # dad 392$op[0x09] = 'dad $B * 256 + $C'; # dad
329$op[0x19] = 'dad $D * 256 + $E'; # dad 393$op[0x19] = 'dad $D * 256 + $E'; # dad
330$op[0x29] = 'dad $H * 256 + $L'; # dad 394$op[0x29] = 'dad $H * 256 + $L'; # dad
331$op[0x39] = 'dad $SP '; # dad 395$op[0x39] = 'dad $SP '; # dad
332 396
333$op[0x07] = ' $FC = $A >> 7; $A = ($A * 2 + $FC) & 0xff '; # rlc 397$op[0x2f] = '$A ^= 0xff'; # cma
334$op[0x17] = ' ($FC, $A) = ($A >> 7, ($A * 2 + $FC) & 0xff)'; # ral
335 398
336$op[0x0f] = ' $FC = $A & 1; $A = ($A >> 1) | ($FC && 0x80) '; # rrc 399$op[0x80 + $_] = 'sf $A += + ' . $reg[$_] for 0..7; # add
337$op[0x1f] = ' ($FC, $A) = ($A & 1, ($A >> 1) | ($FC && 0x80))'; # rar 400$op[0x88 + $_] = 'sf $A += ($FC && 1) + ' . $reg[$_] for 0..7; # adc
401$op[0x90 + $_] = 'sf $A -= + ' . $reg[$_] for 0..7; # sub
402$op[0x98 + $_] = 'sf $A -= ($FC && 1) + ' . $reg[$_] for 0..7; # sbb
403$op[0xa0 + $_] = 'sf8 $A &= ' . $reg[$_] for 0..7; # ana
404$op[0xa8 + $_] = 'sf8 $A ^= ' . $reg[$_] for 0..7; # xra
405$op[0xb0 + $_] = 'sf8 $A |= ' . $reg[$_] for 0..7; # ora
406$op[0xb8 + $_] = 'sf $x = $A - ' . $reg[$_] for 0..7; # cmp
407# possible todo: optimize ora a, maybe xra a, possibly ana
338 408
339$op[0x0a] = '$A = $M[$B * 256 + $C]'; # ldax b 409$op[0xc6] = 'sf $A += IMM8'; # adi
340$op[0x1a] = '$A = $M[$D * 256 + $E]'; # ldax d 410$op[0xd6] = 'sf $A -= IMM8'; # sui
341$op[0x3a] = '$A = $M[IMM16]'; # lda 411$op[0xe6] = 'sf8 $A &= IMM8'; # ani
412$op[0xee] = 'sf8 $A ^= IMM8'; # xri
413$op[0xf6] = 'sf8 $A |= IMM8'; # ori
414$op[0xfe] = 'sf $A - IMM8'; # cpi
415# ce ACI NYI, apparently unused
416# de SBI NYI, apparently unused
342 417
418$op[0xc5] = 'PUSH $B; PUSH $C';
419$op[0xd5] = 'PUSH $D; PUSH $E';
420$op[0xe5] = 'PUSH $H; PUSH $L';
421$op[0xf5] = 'PUSH $A; PUSH +($FS && 0x80) | ($FZ && 0x40) | ($FA && 0x10) | ($FP && 0x04) | ($FC && 0x01)'; # psw
422
423$op[0xc1] = '($C, $B) = (POP, POP)'; # pop
424$op[0xd1] = '($E, $D) = (POP, POP)'; # pop
425$op[0xe1] = '($L, $H) = (POP, POP)'; # pop
426$op[0xf1] = '($x, $A) = (POP, POP); ($FS, $FZ, $FA, $FP, $FC) = ($x & 0x80, $x & 0x40, $x & 0x10, $x & 0x04, $x & 0x01)'; # pop psw
427
428$op[0xc2 + $_ * 8] = 'BRA IMM16 if ' . $cc[$_] for 0..7; # jcc
429$op[0xc3] = 'JMP IMM16'; # jmp
430
431$op[0xc4 + $_ * 8] = '(PUSH PC >> 8), (PUSH PC & 0xff), (BRA IMM16) if ' . $cc[$_] for 0..7; # ccc
432$op[0xcd] = '(PUSH PC >> 8), (PUSH PC & 0xff), (BRA IMM16)'; # call
433
434$op[0xc0 + $_ * 8] = 'BRA POP + POP * 256 if ' . $cc[$_] for 0..7; # rcc
435$op[0xc9] = 'JMP POP + POP * 256'; # ret
436
437$op[0xc7 + $_ * 8] = "JMP $_ * 8" for 0..7; # rst
438
439$op[0xe9] = 'JMP $H * 256 + $L'; # pchl
440# f9 SPHL NYI, apparently unused
441
442$op[0x37] = '$FC = 1 '; # stc
443$op[0x3f] = '$FC = !$FC'; # cmc
444
445$op[0xd3] = 'OUT'; # out
446$op[0xdb] = 'IN'; # in
447
448$op[0xeb] = '($D, $E, $H, $L) = ($H, $L, $D, $E)'; # xchg
449
450# e3 xthl NYI # @ 917b in e69, hl <-> (sp)
451
343$op[0x20] = '$A = $INTPEND * 16 + $INTMASK + ($IFF && 8)'; # rim (incomplete) 452$op[0x20] = '$A = $INTPEND * 16 + $INTMASK + ($IFF && 8)'; # rim (8085, incomplete)
344$op[0x30] = '$INTMASK = $A & 7 if $A & 8'; # sim (incomplete) 453$op[0x30] = '$INTMASK = $A & 7 if $A & 8'; # sim (8085, incomplete)
345 454
346$op[0x22] = '($M[IMM16], $M[IMM16 + 1]) = ($L, $H)'; # shld 455$op[0xf3] = '$IFF = 0'; # di
347$op[0x2a] = '($L, $H) = ($M[IMM16], $M[IMM16 + 1])'; # lhld 456$op[0xfb] = '$IFF = 1'; # ei
348 457
349# yeah, the fucking setup screens actually use daa... 458# yeah, the fucking setup screen actually uses daa...
350$op[0x27] = ' 459$op[0x27] = '
351 my ($h, $l); 460 my ($h, $l);
352 461
353 ($h, $l) = ($A >> 4, $A & 15); 462 ($h, $l) = ($A >> 4, $A & 15);
354 463
355 if ($l > 9 || $FA) { 464 if ($l > 9 || $FA) {
356 $A = sf $A + 6; 465 sf $A += 6;
357 ($h, $l) = ($A >> 4, $A & 15); 466 ($h, $l) = ($A >> 4, $A & 15);
358 } 467 }
359 468
360 if ($h > 9 || $FC) { 469 if ($h > 9 || $FC) {
361 $h += 6; 470 $h += 6;
362 $A = ($h * 16 + $l) & 0xff; 471 $A = ($h * 16 + $l) & 0xff;
363 } 472 }
364'; # daa, almost certainly borked, also, acarry not set by sf 473'; # daa, almost certainly borked, also, acarry not set by sf
365 474
366$op[0x2f] = '$A ^= 0xff'; # cma
367
368$op[0x37] = '$FC = 1 '; # stc
369$op[0x3f] = '$FC = !$FC'; # cmc
370
371$op[0x76] = 'die "HLT"'; # hlt
372
373$op[0x80 + $_] = '$A = sf $A + ' . $reg[$_] for 0..7; # add
374$op[0x88 + $_] = '$A = sf $A + $FC + ' . $reg[$_] for 0..7; # adc
375$op[0x90 + $_] = '$A = sf $A - ' . $reg[$_] for 0..7; # sub
376$op[0x98 + $_] = '$A = sf $A - $FC - ' . $reg[$_] for 0..7; # sbb
377$op[0xa0 + $_] = '$A = sf $A & ' . $reg[$_] for 0..7; # ana
378$op[0xa8 + $_] = '$A = sf $A ^ ' . $reg[$_] for 0..7; # xra
379$op[0xb0 + $_] = '$A = sf $A | ' . $reg[$_] for 0..7; # ora
380$op[0xb8 + $_] = ' sf $A - ' . $reg[$_] for 0..7; # cmp
381# possible todo: optimize ora a, maybe xra a
382
383$op[0xc6 + $_] = '$A = sf $A + IMM8'; # adi
384$op[0xd6 + $_] = '$A = sf $A - IMM8'; # sui
385$op[0xe6 + $_] = '$A = sf $A & IMM8'; # ani
386$op[0xee + $_] = '$A = sf $A ^ IMM8'; # xri
387$op[0xf6 + $_] = '$A = sf $A | IMM8'; # ori
388$op[0xfe + $_] = ' sf $A - IMM8'; # cpi
389
390$op[0xc1] = '($C, $B) = (POP, POP)'; # pop
391$op[0xd1] = '($E, $D) = (POP, POP)'; # pop
392$op[0xe1] = '($L, $H) = (POP, POP)'; # pop
393$op[0xf1] = '($x, $A) = (POP, POP); ($FS, $FZ, $FA, $FP, $FC) = (!!($x & 0x80), !!($x & 0x40), !!($x & 0x10), !!($x & 0x04), !!($x & 0x01))'; # pop psw
394
395$op[0xeb] = '($D, $E, $H, $L) = ($H, $L, $D, $E)'; # xchg
396
397$op[0xc2 + $_ * 8] = 'BRA IMM16 ' . $cc[$_] for 0..7; # jcc
398$op[0xc3] = 'JMP IMM16'; # jmp
399
400$op[0xc4 + $_ * 8] = '(PUSH PC >> 8), (PUSH PC & 0xff), (BRA IMM16) ' . $cc[$_] for 0..7; # ccc
401$op[0xcd] = '(PUSH PC >> 8), (PUSH PC & 0xff), (BRA IMM16)'; # call
402
403$op[0xc7 + $_ * 8] = "JMP $_ * 8" for 0..7; # rst
404
405$op[0xc0 + $_ * 8] = 'BRA POP + POP * 256 ' . $cc[$_] for 0..7; # rcc
406$op[0xc9] = 'JMP POP + POP * 256'; # ret
407
408$op[0xc5] = 'PUSH $B; PUSH $C';
409$op[0xd5] = 'PUSH $D; PUSH $E';
410$op[0xe5] = 'PUSH $H; PUSH $L';
411$op[0xf5] = 'PUSH $A; PUSH +($FS && 0x80) | ($FZ && 0x40) | ($FA && 0x10) | ($FP && 0x04) | ($FC && 0x01)'; # psw
412
413$op[0xd3] = 'OUT'; # out
414$op[0xdb] = 'IN'; # in
415
416# e3 xthl @ 917b, hl <-> (sp)
417
418$op[0xe9] = 'JMP $H * 256 + $L'; # pchl
419
420$op[0xf3] = '$IFF = 0'; # DI
421$op[0xfb] = '$IFF = 1'; # EI
422
423@ops = @op; # for debugging #d#
424
425############################################################################# 475#############################################################################
476# debug
426 477
427# print cpu status, for debugging 478# print cpu status, for debugging
428sub status { 479sub status {
429 my $PC = shift || $PC; 480 my $PC = shift || $PC;
430 481
… …
434 ($FZ ? "1" : "0") 485 ($FZ ? "1" : "0")
435 . ($FS ? "1" : "0") 486 . ($FS ? "1" : "0")
436 . ($FC ? "1" : "0") 487 . ($FC ? "1" : "0")
437 . ($FA ? "1" : "0") 488 . ($FA ? "1" : "0")
438 . ($FP ? "1" : "0"), 489 . ($FP ? "1" : "0"),
439 $M[$PC], $ops[$M[$PC]]; 490 $M[$PC], $op[$M[$PC]];
440} 491}
441 492
442############################################################################# 493#############################################################################
494# video emulation
443 495
444my @chr = ( 496binmode STDOUT;
497
498my @CHARMAP = ( # acschars / chars 0..31
445 " " , "\x{29eb}", "\x{2592}", "\x{2409}", 499 " " , "\x{29eb}", "\x{2592}", "\x{2409}",
446 "\x{240c}", "\x{240d}", "\x{240a}", "\x{00b0}", 500 "\x{240c}", "\x{240d}", "\x{240a}", "\x{00b0}",
447 "\x{00b1}", "\x{2424}", "\x{240b}", "\x{2518}", 501 "\x{00b1}", "\x{2424}", "\x{240b}", "\x{2518}",
448 "\x{2510}", "\x{250c}", "\x{2514}", "\x{253c}", 502 "\x{2510}", "\x{250c}", "\x{2514}", "\x{253c}",
449 "\x{23ba}", "\x{23bb}", "\x{2500}", "\x{23bc}", 503 "\x{23ba}", "\x{23bb}", "\x{2500}", "\x{23bc}",
… …
451 "\x{252c}", "\x{2502}", "\x{2264}", "\x{2265}", 505 "\x{252c}", "\x{2502}", "\x{2264}", "\x{2265}",
452 "\x{03c0}", "\x{2260}", "\x{00a3}", "\x{00b7}", 506 "\x{03c0}", "\x{2260}", "\x{00a3}", "\x{00b7}",
453 (map chr, 0x020 .. 0x7e), 507 (map chr, 0x020 .. 0x7e),
454); 508);
455 509
456utf8::encode $_ for @chr; 510utf8::encode $_ for @CHARMAP;
457 511
458my @sgr; # sgr sequences for attributes 512my @SGR; # sgr sequences for attributes
459 513
460for (0x00 .. 0xff) { 514for (0x00 .. 0xff) {
461 my $sgr = ""; 515 my $sgr = "";
516
517 # ~1 sgr 5 blink
518 # ~2 sgr 4 underline
519 # ~4 sgr 1 bold
520 # 0x80 in attr, sgr 7, reversed
462 521
463 $sgr .= ";5" unless $_ & 0x01; 522 $sgr .= ";5" unless $_ & 0x01;
464 $sgr .= ";4" unless $_ & 0x02; 523 $sgr .= ";4" unless $_ & 0x02;
465 $sgr .= ";1" unless $_ & 0x04; 524 $sgr .= ";1" unless $_ & 0x04;
466 $sgr .= ";7" if $_ & 0x80; 525 $sgr .= ";7" if $_ & 0x80;
467 526
468 $sgr[$_] = "\e[${sgr}m"; 527 $SGR[$_] = "\e[${sgr}m";
469} 528}
470 529
471sub prscr { 530my @LED = $VT102
531 ? qw(L1 INSERT DSR CTS LOCKED LOCAL SCAN BEEP)
532 : qw(L4 L3 L2 L1 LOCKED LOCAL SCAN BEEP);
533
534my $CURSOR_IS_ON;
535
536# display screen
537sub display {
538 # this is for the powersave mode - check whether the cursor is on here,
539 # and only allow powersave later when it was on the last display time
540 $CURSOR_IS_ON = $M[$VT102 ? 0x207b : 0x21ba];
541
472 my $i = 0x2000; 542 my $i = 0x2000;
473 543
544 my $leds = join " ", map $KSTATUS & 2**$_ ? "\e[7m$LED[$_]\e[m" : "$LED[$_]", reverse 0 .. $#LED;
545
474 my $scr = sprintf "\e[H--- KBD %08b CLK %d\e[K\n", $KSTATUS, $CLK; 546 my $scr = sprintf "\e[H--- LED [ %s ] CLK %d\e[K\n", $leds, $CLK;
475 547
476 $scr .= "\e[?5" . ($DC11_REVERSE ? "h" : "l"); 548 $scr .= "\e[?5" . ($DC11_REVERSE ? "h" : "l");
477 549
478 line: 550 line:
479 for my $y (0 .. 25) { # ntsc, two vblank delay lines, up to 24 text lines 551 for my $y (0 .. 25) { # ntsc, two vblank delay lines, up to 24 text lines
480 my $prev_sgr; 552 my $prev_sgr;
481 553
482 $scr .= sprintf "%2d |", ++$y; 554 $scr .= sprintf "%2d \xe2\x94\x82", $y;
483 555
484 for (0..139) { 556 for (0..139) {
485 my $c = $M[$i]; 557 my $c = $M[$i];
486 558
487 if ($c == 0x7f) { # also 0xff, but the firmware avoids that 559 if ($c == 0x7f) { # also 0xff, but the firmware avoids that
488 $scr .= "\e[m|\e[K\n"; 560 $scr .= "\e[m\xe2\x94\x82\e[K\n";
489 561
490 my $a1 = $M[$i + 1]; 562 my $a1 = $M[$i + 1];
491 my $a0 = $M[$i + 2]; 563 my $a0 = $M[$i + 2];
492 564
493 $i = 0x2000 + (($a1 * 256 + $a0) & 0xfff); 565 $i = 0x2000 + (($a1 * 256 + $a0) & 0xfff);
494 566
495 next line; 567 next line;
496 } 568 }
497 569
498 my $sgr = $sgr[ ($M[$i++ + 0x1000] & 15) | ($c & 0x80)]; 570 my $sgr = $SGR[ ($M[$i++ + 0x1000] & 15) | ($c & 0x80)];
499
500 # ~1 sgr 5 blink
501 # ~2 sgr 4 underline
502 # ~4 sgr 1 bold
503 # 0x80 in attr, sgr 7, reversed
504 571
505 $scr .= $prev_sgr = $sgr if $sgr ne $prev_sgr; 572 $scr .= $prev_sgr = $sgr if $sgr ne $prev_sgr;
506 573
507 $scr .= $chr[$c & 0x7f]; 574 $scr .= $CHARMAP[$c & 0x7f];
508 } 575 }
509 576
510 $scr .= "\e[K\nvideo overflow\e[K\n"; 577 $scr .= "\e[K\nvideo overflow\e[K\n";
511 last; 578 last;
512 } 579 }
513 580
514 $scr .= "\e[m"; 581 $scr .= "\e[m\e[J";
515
516 if (0) {
517 $scr .= "\e[K\n";
518 for my $o (0x200 .. 0x232) {
519 $scr .= sprintf "%04x:", $o * 16;
520 for (0..15) {
521 $scr .= sprintf " %02x", $M[$o * 16 + $_];
522 }
523 $scr .= "\e[K\n";
524 }
525 }
526
527 $scr .= "\e[J";
528 582
529 syswrite STDOUT, $scr; 583 syswrite STDOUT, $scr;
530} 584}
531 585
532############################################################################# 586#############################################################################
533 587# keyboard handling
534if (@ARGV) {
535 require IO::Pty;
536 $PTY = IO::Pty->new;
537
538 my $slave = $PTY->slave;
539
540 $PTY->set_winsize (24, 80);
541
542 unless (fork) {
543 $ENV{TERM} = $VT102 ? "vt102" : "vt100";
544
545 close $PTY;
546
547 open STDIN , "<&", $slave;
548 open STDOUT, ">&", $slave;
549 open STDERR, ">&", $slave;
550
551 system "stty ixoff erase ^H";
552
553 $PTY->make_slave_controlling_terminal;
554 $PTY->close_slave;
555
556 exec @ARGV;
557 }
558
559 $PTY->close_slave;
560
561} else {
562 open $PTY, "</dev/null" or die;#d
563}
564
565#############################################################################
566
567# initial key input, to set up online mode etc.
568@KQUEUE = (
569 0x7b, -0x7b, # setup
570 0, # delay
571 0x28, -0x28, # 4, toggle local/online
572 0x38, -0x38, # 5, setup b
573 0, # delay
574 (0x10, -0x10) x 2, # cursor right
575 0x37, -0x37, # 6 toggle soft scroll
576 (0x10, -0x10) x 1, # cursor right
577 0x37, -0x37, # 6 toggle autorepeat off
578 (0x10, -0x10) x 8, # cursor right
579 0x37, -0x37, # 6 toggle keyclick
580 (0x10, -0x10) x 1, # cursor right
581 $VT102 ? () : (0x37, -0x37), # 6 toggle ansi/vt52
582 (0x10, -0x10) x 7, # cursor right
583 0x37, -0x37, # 6 toggle wrap around
584 0x7b, -0x7b, # leave setup
585);
586
587#############################################################################
588 588
589# 0x080 shift, 0x100 ctrl 589# 0x080 shift, 0x100 ctrl
590my %KEYMAP = ( 590my %KEYMAP = (
591 # these get overwritten by generic control codes, but both work, so i have no priority
592 # tid fix these.
593 "\t" => 0x3a, 591 "\t" => 0x3a,
594 "\r" => 0x64, 592 "\r" => 0x64,
595 "\n" => 0x44, 593 "\n" => 0x44,
596 594
597 "\x00" => 0x77 | 0x100, # CTRL-SPACE 595 "\x00" => 0x77 | 0x100, # CTRL-SPACE
… …
622 "\e[11~" => 0x42, # F2 620 "\e[11~" => 0x42, # F2
623 "\e[11~" => 0x31, # F3 621 "\e[11~" => 0x31, # F3
624 "\e[11~" => 0x41, # F4 622 "\e[11~" => 0x41, # F4
625); 623);
626 624
627@KEYMAP{map chr, 0x20..0x40} = unpack "C*", pack "H*", 625@KEYMAP{map chr, 0x20 .. 0x40, 0x5b .. 0x7e} = unpack "C*", pack "H*",
628 "779ad5a9a8b8a755a6b5b6b466256575" . "351a3929283837273626d656e634e5f5" . "b9"; 626 "779ad5a9a8b8a755a6b5b6b466256575" . "351a3929283837273626d656e634e5f5" . "b9" # 20..40
629
630@KEYMAP{map chr, 0x5b .. 0x7e} = unpack "C*", pack "H*",
631 "154514b7a5" . "244a6879591949485816574746766706" . "050a185a0817780969077a95c594a4"; 627 . "154514b7a5" . "244a6879591949485816574746766706" . "050a185a0817780969077a95c594a4"; # 5b..7e
632 628
633$KEYMAP{"\x1f" & $_} ||= $KEYMAP{$_} | 0x100 for "a" .. "z"; # ctrl 629$KEYMAP{"\x1f" & $_} ||= $KEYMAP{$_} | 0x100 for "a" .. "z"; # ctrl
634$KEYMAP{uc $_} ||= $KEYMAP{$_} | 0x080 for "a" .. "z"; # shift 630$KEYMAP{"\x20" ^ $_} ||= $KEYMAP{$_} | 0x080 for "a" .. "z"; # shift
635 631
636my $KEYMATCH = join "|", map quotemeta, reverse sort keys %KEYMAP; 632my $KEYMATCH = join "|", map quotemeta, reverse sort keys %KEYMAP;
637$KEYMATCH = qr{^($KEYMATCH)}s; 633$KEYMATCH = qr{^($KEYMATCH)}s;
638 634
635my %KMOD; # currently pressed modifier keys
636
639sub key { 637sub key {
640 my ($key) = @_; 638 my ($key) = @_;
641 639
642 state %MOD;
643
644 push @KQUEUE, -0x7c if !($key & 0x100) && delete $MOD{0x7c}; # ctrl-up 640 push @KQUEUE, -0x7c if !($key & 0x100) && delete $KMOD{0x7c}; # ctrl-up
645 push @KQUEUE, -0x7d if !($key & 0x080) && delete $MOD{0x7d}; # shift-up 641 push @KQUEUE, -0x7d if !($key & 0x080) && delete $KMOD{0x7d}; # shift-up
646 642
647 push @KQUEUE, 0x7c if $key & 0x100 && !$MOD{0x7c}++; # ctrl-down 643 push @KQUEUE, 0x7c if $key & 0x100 && !$KMOD{0x7c}++; # ctrl-down
648 push @KQUEUE, 0x7d if $key & 0x080 && !$MOD{0x7d}++; # shift-down 644 push @KQUEUE, 0x7d if $key & 0x080 && !$KMOD{0x7d}++; # shift-down
649 645
650 $key &= 0x7f; 646 $key &= 0x7f;
651 push @KQUEUE, $key, -$key; 647 push @KQUEUE, $key, -$key;
652} 648}
653 649
… …
666 eval q{ sub END { system "stty sane" } }; 662 eval q{ sub END { system "stty sane" } };
667 $SIG{INT} = $SIG{TERM} = $SIG{QUIT} = sub { exit 1 }; 663 $SIG{INT} = $SIG{TERM} = $SIG{QUIT} = sub { exit 1 };
668} 664}
669 665
670############################################################################# 666#############################################################################
667# initial key input, to set up online mode etc.
668# could be done via nvram defaults
671 669
670@KQUEUE = (
671 0x7b, -0x7b, # setup
672 0, # delay
673 0x28, -0x28, # 4, toggle local/online
674 0x38, -0x38, # 5, setup b
675 0, # delay
676 (0x10, -0x10) x 2, # cursor right
677 0x37, -0x37, # 6 toggle soft scroll
678 (0x10, -0x10) x 1, # cursor right
679 0x37, -0x37, # 6 toggle autorepeat off
680 (0x10, -0x10) x 8, # cursor right
681 0x37, -0x37, # 6 toggle keyclick
682 (0x10, -0x10) x 1, # cursor right
683 $VT102 ? () : (0x37, -0x37), # 6 toggle ansi/vt52
684 (0x10, -0x10) x 7, # cursor right
685 0x37, -0x37, # 6 toggle wrap around
686 0x7b, -0x7b, # leave setup
687);
688
689#############################################################################
690# process/pty management
691
692if (1) {
693 require IO::Pty;
694 $PTY = IO::Pty->new;
695
696 my $slave = $PTY->slave;
697
698 $PTY->set_winsize (24, 80);
699
700 unless (fork) {
701 $ENV{LC_ALL} = "C";
702 $ENV{TERM} = $VT102 ? "vt102" : "vt100";
703
704 close $PTY;
705
706 open STDIN , "<&", $slave;
707 open STDOUT, ">&", $slave;
708 open STDERR, ">&", $slave;
709
710 system "stty ixoff erase ^H";
711
712 $PTY->make_slave_controlling_terminal;
713 $PTY->close_slave;
714
715 @ARGV = "sh" unless @ARGV;
716 exec @ARGV;
717 }
718
719 $PTY->close_slave;
720} else {
721 open $PTY, "+</dev/null"
722 or die "/dev/null: $!";
723}
724
725#############################################################################
726# the actual hardware simulator
727
672my @ICACHE; # compiled instruction cache 728my @ICACHE; # compiled instruction/basic block cache
673 729
730my $POWERSAVE; # powersave counter
731
732my $RIN; # libev for the less well-off
733
734(vec $RIN, 0, 1) = 1 if $KBD;
735(vec $RIN, fileno $PTY, 1) = 1 if $PTY;
736
674# the cpu 737# the cpu.
675while () { 738while () {
676
677 # execute extended basic blocks 739 # execute an extended basic block
678 $PC = ($ICACHE[$PC] ||= do { 740 $PC = ($ICACHE[$PC] ||= do {
679 my $pc = $PC; 741 my $pc = $PC;
680 742
681 my $insn = ""; 743 my $insn = "";
682 744
683 # the jit compiler 745 # the jit compiler
684 for (0..15) { 746 for (0..31) {
685
686 # optional tracing support
687 if (0) {
688 $insn .= qq<
689 if (\$PRSTATUS) {
690 status $pc;
691 die unless --\$PRSTATUS;
692 }
693 >;
694 }
695
696 my $imm; 747 my $imm;
697 my $op = $op[$M[$pc++]]; 748 my $op = $op[$M[$pc++]];
698 749
699 for ($op) { 750 for ($op) {
700 s/\bPUSH\b/\$M[--\$SP] =/g; # push byte to stack 751 s/\bPUSH\b/\$M[--\$SP] =/g; # push byte to stack
… …
705 756
706 s/\bPC\b/$pc/ge; # PC at end of insn 757 s/\bPC\b/$pc/ge; # PC at end of insn
707 s/\bBRA\b/return/g; # conditional jump 758 s/\bBRA\b/return/g; # conditional jump
708 s/\bJMP\b(.*)/$1\x00/sg; # unconditional jump 759 s/\bJMP\b(.*)/$1\x00/sg; # unconditional jump
709 760
710 s/\bIN\b/ sprintf "\$A = in_%02x", $M[$pc++]/xge; 761 s/\bIN\b/ sprintf "\$A = in_%02x", $M[$pc++]/xge; # in insns call in_HEX
711 s/\bOUT\b/sprintf "out_%02x \$A ", $M[$pc++]/xge; 762 s/\bOUT\b/sprintf "out_%02x \$A ", $M[$pc++]/xge; # out likewise
712 } 763 }
713 764
714 $insn .= "$op;\n"; 765 $insn .= "$op;\n";
715 } 766 }
716 767
717 768
718 $insn .= "$pc"; 769 $insn .= $pc;
719 $insn =~ s/\x00.*$//s; 770 $insn =~ s/\x00.*$//s;
720 771
721 eval "use integer; sub { $insn }" or die "$insn: $@" 772 eval "sub { $insn }" or die "$insn: $@"
722 })->(); 773 })->();
723 774
724 ++$CLK; 775 ++$CLK;
725 776
726 # things we do from time too time only 777 # things we do from time to time only
727 unless ($CLK & 0xf) { 778 unless ($CLK & 0xf) {
728 # do I/O 779 # do I/O
729 780
730 unless ($CLK & 0x7ff) { 781 unless ($CLK & 0xfff) {
782 if (select $x = $RIN, undef, undef, $POWERSAVE < 10 ? 0 : $CURSOR_IS_ON && 10) {
731 783
732 # pty/serial I/O 784 # pty/serial I/O
733 unless (@PUSARTRECV || @KQUEUE || !$PTY) { 785 if ($PTY && (vec $x, fileno $PTY, 1) && (@PUSARTRECV < 128) && !@KQUEUE) {
734 my $rin = ""; (vec $rin, fileno $PTY, 1) = 1;
735
736 if (select $rin, undef, undef, 0) {
737 sysread $PTY, my $buf, 256; 786 sysread $PTY, my $buf, 256;
787
788 # linux don't do cs7 and/or parity anymore, so we need to filter # out xoff characters to avoid freezes.
738 push @PUSARTRECV, unpack "C*", $buf; 789 push @PUSARTRECV, grep { ($_ & 0x7f) != 0x13 } unpack "C*", $buf;
739 } 790 }
740 }
741 791
742 # keyboard input 792 # keyboard input
743 if ($KBD) { 793 if ($KBD && (vec $x, 0, 1)) {
794 # to avoid non-blocking mode on stdin (and stty min 0), we
795 # just read byte-by-byte after a select says there is data.
744 while (select my $rin = "\x01", undef, undef, 0) { 796 while (select my $rin = "\x01", undef, undef, 0) {
745 sysread STDIN, $STDIN_BUF, 1, length $STDIN_BUF 797 sysread STDIN, $STDIN_BUF, 1, length $STDIN_BUF
746 or last; 798 or last;
799 }
800
801 stdin_parse if length $STDIN_BUF;
747 } 802 }
748 803
749 stdin_parse if length $STDIN_BUF; 804 $POWERSAVE = 0; # activity
805 } elsif (@PUSARTRECV || @KQUEUE) {
806 $POWERSAVE = 0;
807 } else {
808 ++$POWERSAVE;
750 } 809 }
751 } 810 }
752 811
753 # kick off various interrupts 812 # kick off serial input interrupt quite often
754
755 $RST |= 2 if @PUSARTRECV && $XON; # VT100, but works on vt102, too (probably not used on real hardware though) 813 $RST |= 2 if @PUSARTRECV && $XON; # VT100, but works on vt102, too (probably not used on real hardware though)
756 #$INTPEND |= 2 if @PUSARTRECV && $XON; # VT102, 6.5 rxrdy 814 #$INTPEND |= 2 if @PUSARTRECV && $XON; # VT102, 6.5 rxrdy
757 815
758 # kick off vertical retrace form time to time 816 # kick off vertical retrace interrupt from time to time
759 unless ($CLK & 0x1ff) { 817 unless ($CLK & 0x1ff) {
760 $RST |= 4; # vertical retrace 818 $RST |= 4; # vertical retrace
761 } 819 }
762 820
763 # handle video hardware 821 # handle video hardware
764
765 unless ($CLK & 0x1fff) { 822 unless ($CLK & 0x3fff) {
766 prscr; 823 display;
767 } 824 }
768 } 825 }
769 826
770 # the interrupt logic 827 # the interrupt logic - we only interrupt after basic blocks
771 $x = $INTPEND & ~$INTMASK; 828 # which, as a side effect, ensures that we don't interrupt
772 if (($RST || $x) && $IFF) { 829 # "ei; ret" sequences and thus reduce the risk of stack overflows.
830 if (($RST || ($INTPEND & ~$INTMASK)) && $IFF) {
773 # rst 1 kbd data available 831 # rst 1 kbd data available
774 # rst 2 pusart xmit+recv flag 832 # rst 2 pusart xmit+recv flag
775 # rst 4 vertical retrace 833 # rst 4 vertical retrace
776 # 5.5 vt125 mb7 trans ready (serial send?) 834 # 5.5 vt125 mb7 trans ready (serial send?)
777 # 6.5 vt125 mb7 read ready (something modem?) 835 # 6.5 vt125 mb7 read ready (something modem?)
778 # 7.5 vt125 mb7 vblank h(?) 836 # 7.5 vt125 mb7 vblank h(?)
779 # trap vt125 mbi init h(?) 837 # trap vt125 mbi init h(?)
780 my $vec; 838 my $vec;
781 839
840 my $pend = $INTPEND & ~$INTMASK;
841
782 if ($x & 1) { $vec = 0x2c; $INTPEND &= ~1; 842 if ($pend & 1) { $vec = 0x2c; $INTPEND &= ~1;
783 } elsif ($x & 2) { $vec = 0x34; $INTPEND &= ~2; 843 } elsif ($pend & 2) { $vec = 0x34; $INTPEND &= ~2;
784 } elsif ($x & 4) { $vec = 0x3c; $INTPEND &= ~4; 844 } elsif ($pend & 4) { $vec = 0x3c; $INTPEND &= ~4;
785# } elsif ($RST ) { $vec = $RST * 8; $RST = 0; # for some reason, this breaks vt102 845# } elsif ($RST ) { $vec = $RST * 8; $RST = 0; # the vt102 firmware doesn't like combined interrupts
786 } elsif ($RST & 1) { $vec = 0x08; $RST &= ~1; # separate is better for vt102 846 } elsif ($RST & 1) { $vec = 0x08; $RST &= ~1; # separate is better for vt102
787 } elsif ($RST & 2) { $vec = 0x10; $RST &= ~2; 847 } elsif ($RST & 2) { $vec = 0x10; $RST &= ~2;
788 } elsif ($RST & 4) { $vec = 0x20; $RST &= ~4; 848 } elsif ($RST & 4) { $vec = 0x20; $RST &= ~4;
789 } else { 849 } else {
790 die; 850 die;
791 } 851 }
792 852
853 # jump to the interrupt vector
793 $M[--$SP] = $PC >> 8; 854 $M[--$SP] = $PC >> 8;
794 $M[--$SP] = $PC & 0xff; 855 $M[--$SP] = $PC & 0xff;
795 $PC = $vec; 856 $PC = $vec;
796 857
797 $IFF = 0; 858 $IFF = 0;
798 } 859 }
799} 860}
861
862#############################################################################
863# roms in the data section + one newline
864#
865# vt100 @ 0x0000+0x0800 23-032E2
866# vt100 @ 0x0800+0x0800 23-061E2
867# vt100 @ 0x1000+0x0800 23-033E2
868# vt100 @ 0x1800+0x0800 23-034E2
869#
870# vt102 @ 0x0000+0x2000 23-226E4
871# vt102 @ 0x8000+0x2000 23-225E4
872#
873# vt131 @ 0xa000+0x0800 23-280E2
874#
800 875
801__DATA__ 876__DATA__
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