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1 | /* i1401_mt.c: IBM 1401 magnetic tape simulator\r |
2 | \r | |
3 | Copyright (c) 1993-2007, Robert M. Supnik\r | |
4 | \r | |
5 | Permission is hereby granted, free of charge, to any person obtaining a\r | |
6 | copy of this software and associated documentation files (the "Software"),\r | |
7 | to deal in the Software without restriction, including without limitation\r | |
8 | the rights to use, copy, modify, merge, publish, distribute, sublicense,\r | |
9 | and/or sell copies of the Software, and to permit persons to whom the\r | |
10 | Software is furnished to do so, subject to the following conditions:\r | |
11 | \r | |
12 | The above copyright notice and this permission notice shall be included in\r | |
13 | all copies or substantial portions of the Software.\r | |
14 | \r | |
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r | |
16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r | |
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL\r | |
18 | ROBERT M SUPNIK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER\r | |
19 | IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN\r | |
20 | CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.\r | |
21 | \r | |
22 | Except as contained in this notice, the name of Robert M Supnik shall not be\r | |
23 | used in advertising or otherwise to promote the sale, use or other dealings\r | |
24 | in this Software without prior written authorization from Robert M Supnik.\r | |
25 | \r | |
26 | mt 7-track magtape\r | |
27 | \r | |
28 | 07-Jul-07 RMS Removed restriction on load-mode binary tape\r | |
29 | 28-Jun-07 RMS Revised read tape mark behavior based on real hardware\r | |
30 | (found by Van Snyder)\r | |
31 | 16-Feb-06 RMS Added tape capacity checking\r | |
32 | 15-Sep-05 RMS Yet another fix to load read group mark plus word mark\r | |
33 | Added debug printouts (from Van Snyder)\r | |
34 | 26-Aug-05 RMS Revised to use API for write lock check\r | |
35 | 16-Aug-03 RMS End-of-record on load read works like move read\r | |
36 | (verified on real 1401)\r | |
37 | Added diagnostic read (space forward)\r | |
38 | 25-Apr-03 RMS Revised for extended file support\r | |
39 | 28-Mar-03 RMS Added multiformat support\r | |
40 | 15-Mar-03 RMS Fixed end-of-record on load read yet again\r | |
41 | 28-Feb-03 RMS Modified for magtape library\r | |
42 | 31-Oct-02 RMS Added error record handling\r | |
43 | 10-Oct-02 RMS Fixed end-of-record on load read writes WM plus GM\r | |
44 | 30-Sep-02 RMS Revamped error handling\r | |
45 | 28-Aug-02 RMS Added end of medium support\r | |
46 | 12-Jun-02 RMS End-of-record on move read preserves old WM under GM\r | |
47 | (found by Van Snyder)\r | |
48 | 03-Jun-02 RMS Modified for 1311 support\r | |
49 | 30-May-02 RMS Widened POS to 32b\r | |
50 | 22-Apr-02 RMS Added protection against bad record lengths\r | |
51 | 30-Jan-02 RMS New zero footprint tape bootstrap from Van Snyder\r | |
52 | 20-Jan-02 RMS Changed write enabled modifier\r | |
53 | 29-Nov-01 RMS Added read only unit support\r | |
54 | 18-Apr-01 RMS Changed to rewind tape before boot\r | |
55 | 07-Dec-00 RMS Widened display width from 6 to 8 bits to see record lnt\r | |
56 | CEO Added tape bootstrap\r | |
57 | 14-Apr-99 RMS Changed t_addr to unsigned\r | |
58 | 04-Oct-98 RMS V2.4 magtape format\r | |
59 | \r | |
60 | Magnetic tapes are represented as a series of variable 16b records\r | |
61 | of the form:\r | |
62 | \r | |
63 | 32b byte count\r | |
64 | byte 0\r | |
65 | byte 1\r | |
66 | :\r | |
67 | byte n-2\r | |
68 | byte n-1\r | |
69 | 32b byte count\r | |
70 | \r | |
71 | If the byte count is odd, the record is padded with an extra byte\r | |
72 | of junk. File marks are represented by a byte count of 0.\r | |
73 | */\r | |
74 | \r | |
75 | #include "i1401_defs.h"\r | |
76 | #include "sim_tape.h"\r | |
77 | \r | |
78 | #define MT_NUMDR 7 /* #drives */\r | |
79 | #define MT_MAXFR (MAXMEMSIZE * 2) /* max transfer */\r | |
80 | \r | |
81 | uint8 dbuf[MT_MAXFR]; /* tape buffer */\r | |
82 | \r | |
83 | extern uint8 M[]; /* memory */\r | |
84 | extern int32 ind[64];\r | |
85 | extern int32 BS, iochk;\r | |
86 | extern UNIT cpu_unit;\r | |
87 | extern FILE *sim_deb;\r | |
88 | \r | |
89 | t_stat mt_reset (DEVICE *dptr);\r | |
90 | t_stat mt_boot (int32 unitno, DEVICE *dptr);\r | |
91 | t_stat mt_map_status (t_stat st);\r | |
92 | UNIT *get_unit (int32 unit);\r | |
93 | \r | |
94 | /* MT data structures\r | |
95 | \r | |
96 | mt_dev MT device descriptor\r | |
97 | mt_unit MT unit list\r | |
98 | mt_reg MT register list\r | |
99 | mt_mod MT modifier list\r | |
100 | */\r | |
101 | \r | |
102 | UNIT mt_unit[] = {\r | |
103 | { UDATA (NULL, UNIT_DIS, 0) }, /* doesn't exist */\r | |
104 | { UDATA (NULL, UNIT_DISABLE + UNIT_ATTABLE +\r | |
105 | UNIT_ROABLE + UNIT_BCD, 0) },\r | |
106 | { UDATA (NULL, UNIT_DISABLE + UNIT_ATTABLE +\r | |
107 | UNIT_ROABLE + UNIT_BCD, 0) },\r | |
108 | { UDATA (NULL, UNIT_DISABLE + UNIT_ATTABLE +\r | |
109 | UNIT_ROABLE + UNIT_BCD, 0) },\r | |
110 | { UDATA (NULL, UNIT_DISABLE + UNIT_ATTABLE +\r | |
111 | UNIT_ROABLE + UNIT_BCD, 0) },\r | |
112 | { UDATA (NULL, UNIT_DISABLE + UNIT_ATTABLE +\r | |
113 | UNIT_ROABLE + UNIT_BCD, 0) },\r | |
114 | { UDATA (NULL, UNIT_DISABLE + UNIT_ATTABLE +\r | |
115 | UNIT_ROABLE + UNIT_BCD, 0) }\r | |
116 | };\r | |
117 | \r | |
118 | REG mt_reg[] = {\r | |
119 | { FLDATA (END, ind[IN_END], 0) },\r | |
120 | { FLDATA (ERR, ind[IN_TAP], 0) },\r | |
121 | { DRDATA (POS1, mt_unit[1].pos, T_ADDR_W), PV_LEFT + REG_RO },\r | |
122 | { DRDATA (POS2, mt_unit[2].pos, T_ADDR_W), PV_LEFT + REG_RO },\r | |
123 | { DRDATA (POS3, mt_unit[3].pos, T_ADDR_W), PV_LEFT + REG_RO },\r | |
124 | { DRDATA (POS4, mt_unit[4].pos, T_ADDR_W), PV_LEFT + REG_RO },\r | |
125 | { DRDATA (POS5, mt_unit[5].pos, T_ADDR_W), PV_LEFT + REG_RO },\r | |
126 | { DRDATA (POS6, mt_unit[6].pos, T_ADDR_W), PV_LEFT + REG_RO },\r | |
127 | { NULL }\r | |
128 | };\r | |
129 | \r | |
130 | MTAB mt_mod[] = {\r | |
131 | { MTUF_WLK, 0, "write enabled", "WRITEENABLED", NULL },\r | |
132 | { MTUF_WLK, MTUF_WLK, "write locked", "LOCKED", NULL }, \r | |
133 | { MTAB_XTD|MTAB_VUN, 0, "FORMAT", "FORMAT",\r | |
134 | &sim_tape_set_fmt, &sim_tape_show_fmt, NULL },\r | |
135 | { MTAB_XTD|MTAB_VUN, 0, "CAPACITY", "CAPACITY",\r | |
136 | &sim_tape_set_capac, &sim_tape_show_capac, NULL },\r | |
137 | { 0 }\r | |
138 | };\r | |
139 | \r | |
140 | DEVICE mt_dev = {\r | |
141 | "MT", mt_unit, mt_reg, mt_mod,\r | |
142 | MT_NUMDR, 10, 31, 1, 8, 8,\r | |
143 | NULL, NULL, &mt_reset,\r | |
144 | &mt_boot, &sim_tape_attach, &sim_tape_detach,\r | |
145 | NULL, DEV_DEBUG\r | |
146 | };\r | |
147 | \r | |
148 | /* Function routine\r | |
149 | \r | |
150 | Inputs:\r | |
151 | unit = unit character\r | |
152 | mod = modifier character\r | |
153 | Outputs:\r | |
154 | status = status\r | |
155 | */\r | |
156 | \r | |
157 | t_stat mt_func (int32 unit, int32 mod)\r | |
158 | {\r | |
159 | t_mtrlnt tbc;\r | |
160 | UNIT *uptr;\r | |
161 | t_stat st;\r | |
162 | \r | |
163 | if ((uptr = get_unit (unit)) == NULL) return STOP_INVMTU; /* valid unit? */\r | |
164 | if ((uptr->flags & UNIT_ATT) == 0) return SCPE_UNATT; /* attached? */\r | |
165 | switch (mod) { /* case on modifier */\r | |
166 | \r | |
167 | case BCD_A: /* diagnostic read */\r | |
168 | if (DEBUG_PRS (mt_dev)) fprintf (sim_deb,\r | |
169 | ">>MT%d: diagnostic read\n", unit);\r | |
170 | ind[IN_END] = 0; /* clear end of file */\r | |
171 | st = sim_tape_sprecf (uptr, &tbc); /* space fwd */\r | |
172 | break;\r | |
173 | \r | |
174 | case BCD_B: /* backspace */\r | |
175 | if (DEBUG_PRS (mt_dev)) fprintf (sim_deb,\r | |
176 | ">>MT%d: backspace\n", unit);\r | |
177 | ind[IN_END] = 0; /* clear end of file */\r | |
178 | st = sim_tape_sprecr (uptr, &tbc); /* space rev */\r | |
179 | break; /* end case */\r | |
180 | \r | |
181 | case BCD_E: /* erase = nop */\r | |
182 | if (DEBUG_PRS (mt_dev)) fprintf (sim_deb,\r | |
183 | ">>MT%d: erase\n", unit);\r | |
184 | if (sim_tape_wrp (uptr)) return STOP_MTL;\r | |
185 | return SCPE_OK;\r | |
186 | \r | |
187 | case BCD_M: /* write tapemark */\r | |
188 | if (DEBUG_PRS (mt_dev)) fprintf (sim_deb,\r | |
189 | ">>MT%d: write tape mark\n", unit);\r | |
190 | st = sim_tape_wrtmk (uptr); /* write tmk */\r | |
191 | break;\r | |
192 | \r | |
193 | case BCD_R: /* rewind */\r | |
194 | if (DEBUG_PRS (mt_dev)) fprintf (sim_deb,\r | |
195 | ">>MT%d: rewind\n", unit);\r | |
196 | sim_tape_rewind (uptr); /* update position */\r | |
197 | return SCPE_OK;\r | |
198 | \r | |
199 | case BCD_U: /* unload */\r | |
200 | if (DEBUG_PRS (mt_dev)) fprintf (sim_deb,\r | |
201 | ">>MT%d: rewind and unload\n", unit);\r | |
202 | sim_tape_rewind (uptr); /* update position */\r | |
203 | return detach_unit (uptr); /* detach */\r | |
204 | \r | |
205 | default:\r | |
206 | return STOP_INVM;\r | |
207 | }\r | |
208 | \r | |
209 | return mt_map_status (st);\r | |
210 | }\r | |
211 | \r | |
212 | /* Read and write routines\r | |
213 | \r | |
214 | Inputs:\r | |
215 | unit = unit character\r | |
216 | flag = normal, word mark, or binary mode\r | |
217 | mod = modifier character\r | |
218 | Outputs:\r | |
219 | status = status\r | |
220 | \r | |
221 | Fine point: after a read, the system writes a group mark just\r | |
222 | beyond the end of the record. However, first it checks for a\r | |
223 | GM + WM; if present, the GM + WM is not changed. Otherwise,\r | |
224 | an MCW read sets a GM, preserving the current WM; while an LCA\r | |
225 | read sets a GM and clears the WM.\r | |
226 | */\r | |
227 | \r | |
228 | t_stat mt_io (int32 unit, int32 flag, int32 mod)\r | |
229 | {\r | |
230 | int32 t, wm_seen;\r | |
231 | t_mtrlnt i, tbc;\r | |
232 | t_stat st;\r | |
233 | t_bool passed_eot;\r | |
234 | UNIT *uptr;\r | |
235 | \r | |
236 | if ((uptr = get_unit (unit)) == NULL) return STOP_INVMTU; /* valid unit? */\r | |
237 | if ((uptr->flags & UNIT_ATT) == 0) return SCPE_UNATT; /* attached? */\r | |
238 | \r | |
239 | switch (mod) {\r | |
240 | \r | |
241 | case BCD_R: /* read */\r | |
242 | if (DEBUG_PRS (mt_dev))\r | |
243 | fprintf (sim_deb, ">>MT%d: read from %d", unit, BS);\r | |
244 | ind[IN_TAP] = ind[IN_END] = 0; /* clear error */\r | |
245 | wm_seen = 0; /* no word mk seen */\r | |
246 | st = sim_tape_rdrecf (uptr, dbuf, &tbc, MT_MAXFR); /* read rec */\r | |
247 | if (st == MTSE_RECE) ind[IN_TAP] = 1; /* rec in error? */\r | |
248 | else if (st == MTSE_TMK) { /* tape mark? */\r | |
249 | ind[IN_END] = 1; /* set indicator */\r | |
250 | tbc = 1; /* one char read */\r | |
251 | dbuf[0] = BCD_TAPMRK; /* BCD tapemark */\r | |
252 | }\r | |
253 | else if (st != MTSE_OK) { /* stop on error */\r | |
254 | if (DEBUG_PRS (mt_dev))\r | |
255 | fprintf (sim_deb, ", stopped by status = %d\n", st);\r | |
256 | break;\r | |
257 | }\r | |
258 | for (i = 0; i < tbc; i++) { /* loop thru buf */\r | |
259 | if (M[BS] == (BCD_GRPMRK + WM)) { /* GWM in memory? */\r | |
260 | if (DEBUG_PRS (mt_dev))\r | |
261 | fprintf (sim_deb, " to %d, stopped by GMWM\n", BS);\r | |
262 | BS++; /* incr BS */\r | |
263 | if (ADDR_ERR (BS)) { /* test for wrap */\r | |
264 | BS = BA | (BS % MAXMEMSIZE);\r | |
265 | return STOP_WRAP;\r | |
266 | }\r | |
267 | return SCPE_OK; /* done */\r | |
268 | }\r | |
269 | t = dbuf[i]; /* get char */\r | |
270 | if (!(flag & MD_BIN) && (t == BCD_ALT)) /* BCD mode alt blank? */\r | |
271 | t = BCD_BLANK; /* real blank */\r | |
272 | if (flag & MD_WM) { /* word mk mode? */\r | |
273 | if ((t == BCD_WM) && (wm_seen == 0)) /* WM char, none prev? */\r | |
274 | wm_seen = WM; /* set flag */\r | |
275 | else {\r | |
276 | M[BS] = wm_seen | (t & CHAR); /* char + wm seen */\r | |
277 | wm_seen = 0; /* clear flag */\r | |
278 | }\r | |
279 | }\r | |
280 | else M[BS] = (M[BS] & WM) | (t & CHAR); /* preserve mem WM */\r | |
281 | if (!wm_seen) BS++;\r | |
282 | if (ADDR_ERR (BS)) { /* check next BS */\r | |
283 | BS = BA | (BS % MAXMEMSIZE);\r | |
284 | return STOP_WRAP;\r | |
285 | }\r | |
286 | }\r | |
287 | if (M[BS] != (BCD_GRPMRK + WM)) { /* not GM+WM at end? */\r | |
288 | if (flag & MD_WM) M[BS] = BCD_GRPMRK; /* LCA: clear WM */\r | |
289 | else M[BS] = (M[BS] & WM) | BCD_GRPMRK; /* MCW: save WM */\r | |
290 | }\r | |
291 | if (DEBUG_PRS (mt_dev))\r | |
292 | fprintf (sim_deb, " to %d, stopped by EOR\n", BS);\r | |
293 | BS++; /* adv BS */\r | |
294 | if (ADDR_ERR (BS)) { /* check final BS */\r | |
295 | BS = BA | (BS % MAXMEMSIZE);\r | |
296 | return STOP_WRAP;\r | |
297 | }\r | |
298 | break;\r | |
299 | \r | |
300 | case BCD_W:\r | |
301 | if (sim_tape_wrp (uptr)) return STOP_MTL; /* locked? */\r | |
302 | if (M[BS] == (BCD_GRPMRK + WM)) return STOP_MTZ;/* eor? */\r | |
303 | if (DEBUG_PRS (mt_dev))\r | |
304 | fprintf (sim_deb, ">>MT%d: write from %d", unit, BS);\r | |
305 | ind[IN_TAP] = ind[IN_END] = 0; /* clear error */\r | |
306 | for (tbc = 0; (t = M[BS++]) != (BCD_GRPMRK + WM); ) {\r | |
307 | if ((t & WM) && (flag & MD_WM)) /* WM in wm mode? */\r | |
308 | dbuf[tbc++] = BCD_WM;\r | |
309 | if (((t & CHAR) == BCD_BLANK) && !(flag & MD_BIN))\r | |
310 | dbuf[tbc++] = BCD_ALT;\r | |
311 | else dbuf[tbc++] = t & CHAR;\r | |
312 | if (ADDR_ERR (BS)) { /* check next BS */\r | |
313 | BS = BA | (BS % MAXMEMSIZE);\r | |
314 | return STOP_WRAP;\r | |
315 | }\r | |
316 | }\r | |
317 | if (DEBUG_PRS (mt_dev)) fprintf (sim_deb, " to %d\n", BS - 1);\r | |
318 | passed_eot = sim_tape_eot (uptr); /* passed EOT? */\r | |
319 | st = sim_tape_wrrecf (uptr, dbuf, tbc); /* write record */\r | |
320 | if (!passed_eot && sim_tape_eot (uptr)) /* just passed EOT? */\r | |
321 | ind[IN_END] = 1;\r | |
322 | if (ADDR_ERR (BS)) { /* check final BS */\r | |
323 | BS = BA | (BS % MAXMEMSIZE);\r | |
324 | return STOP_WRAP;\r | |
325 | }\r | |
326 | break;\r | |
327 | \r | |
328 | default:\r | |
329 | return STOP_INVM;\r | |
330 | }\r | |
331 | \r | |
332 | return mt_map_status (st);\r | |
333 | }\r | |
334 | \r | |
335 | /* Get unit pointer from unit number */\r | |
336 | \r | |
337 | UNIT *get_unit (int32 unit)\r | |
338 | {\r | |
339 | if ((unit <= 0) || (unit >= MT_NUMDR)) return NULL;\r | |
340 | return mt_dev.units + unit;\r | |
341 | }\r | |
342 | \r | |
343 | /* Map tape status */\r | |
344 | \r | |
345 | t_stat mt_map_status (t_stat st)\r | |
346 | {\r | |
347 | switch (st) {\r | |
348 | \r | |
349 | case MTSE_OK: /* no error */\r | |
350 | case MTSE_BOT: /* reverse into BOT */\r | |
351 | break;\r | |
352 | \r | |
353 | case MTSE_FMT: /* illegal fmt */\r | |
354 | return SCPE_IERR;\r | |
355 | \r | |
356 | case MTSE_UNATT: /* not attached */\r | |
357 | return SCPE_UNATT;\r | |
358 | \r | |
359 | case MTSE_INVRL: /* invalid rec lnt */\r | |
360 | return SCPE_MTRLNT;\r | |
361 | \r | |
362 | case MTSE_TMK: /* end of file */\r | |
363 | ind[IN_END] = 1; /* set end mark */\r | |
364 | break;\r | |
365 | \r | |
366 | case MTSE_IOERR: /* IO error */\r | |
367 | ind[IN_TAP] = 1; /* set error */\r | |
368 | if (iochk) return SCPE_IOERR;\r | |
369 | break;\r | |
370 | \r | |
371 | case MTSE_RECE: /* record in error */\r | |
372 | case MTSE_EOM: /* end of medium */\r | |
373 | ind[IN_TAP] = 1; /* set error */\r | |
374 | break;\r | |
375 | \r | |
376 | case MTSE_WRP: /* write protect */\r | |
377 | return STOP_MTL;\r | |
378 | }\r | |
379 | \r | |
380 | return SCPE_OK;\r | |
381 | }\r | |
382 | \r | |
383 | /* Reset routine */\r | |
384 | \r | |
385 | t_stat mt_reset (DEVICE *dptr)\r | |
386 | {\r | |
387 | int32 i;\r | |
388 | UNIT *uptr;\r | |
389 | \r | |
390 | for (i = 0; i < MT_NUMDR; i++) { /* clear pos flag */\r | |
391 | if (uptr = get_unit (i)) MT_CLR_PNU (uptr);\r | |
392 | }\r | |
393 | ind[IN_END] = ind[IN_TAP] = 0; /* clear indicators */\r | |
394 | return SCPE_OK;\r | |
395 | }\r | |
396 | \r | |
397 | /* Bootstrap routine */\r | |
398 | \r | |
399 | t_stat mt_boot (int32 unitno, DEVICE *dptr)\r | |
400 | {\r | |
401 | extern int32 saved_IS;\r | |
402 | \r | |
403 | sim_tape_rewind (&mt_unit[unitno]); /* force rewind */\r | |
404 | BS = 1; /* set BS = 001 */\r | |
405 | mt_io (unitno, MD_WM, BCD_R); /* LDA %U1 001 R */\r | |
406 | saved_IS = 1;\r | |
407 | return SCPE_OK;\r | |
408 | }\r |