| 1 |
/* |
| 2 |
* 1541d64.cpp - 1541 emulation in .d64 file |
| 3 |
* |
| 4 |
* Frodo (C) 1994-1997,2002-2003 Christian Bauer |
| 5 |
* |
| 6 |
* This program is free software; you can redistribute it and/or modify |
| 7 |
* it under the terms of the GNU General Public License as published by |
| 8 |
* the Free Software Foundation; either version 2 of the License, or |
| 9 |
* (at your option) any later version. |
| 10 |
* |
| 11 |
* This program is distributed in the hope that it will be useful, |
| 12 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 |
* GNU General Public License for more details. |
| 15 |
* |
| 16 |
* You should have received a copy of the GNU General Public License |
| 17 |
* along with this program; if not, write to the Free Software |
| 18 |
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 |
*/ |
| 20 |
|
| 21 |
/* |
| 22 |
* Incompatibilities: |
| 23 |
* ------------------ |
| 24 |
* |
| 25 |
* - Only read accesses possible |
| 26 |
* - Not all commands implemented |
| 27 |
* - The .d64 error info is read, but unused |
| 28 |
*/ |
| 29 |
|
| 30 |
#include "sysdeps.h" |
| 31 |
|
| 32 |
#include "1541d64.h" |
| 33 |
#include "IEC.h" |
| 34 |
#include "Prefs.h" |
| 35 |
#include "C64.h" |
| 36 |
|
| 37 |
|
| 38 |
// Channel modes (IRC users listen up :-) |
| 39 |
enum { |
| 40 |
CHMOD_FREE, // Channel free |
| 41 |
CHMOD_COMMAND, // Command/error channel |
| 42 |
CHMOD_DIRECTORY, // Reading directory |
| 43 |
CHMOD_FILE, // Sequential file open |
| 44 |
CHMOD_DIRECT // Direct buffer access ('#') |
| 45 |
}; |
| 46 |
|
| 47 |
// Number of tracks/sectors |
| 48 |
const int NUM_TRACKS = 35; |
| 49 |
const int NUM_SECTORS = 683; |
| 50 |
|
| 51 |
// Prototypes |
| 52 |
static bool match(uint8 *p, uint8 *n); |
| 53 |
|
| 54 |
|
| 55 |
/* |
| 56 |
* Constructor: Prepare emulation, open .d64 file |
| 57 |
*/ |
| 58 |
|
| 59 |
D64Drive::D64Drive(IEC *iec, char *filepath) : Drive(iec) |
| 60 |
{ |
| 61 |
the_file = NULL; |
| 62 |
ram = NULL; |
| 63 |
|
| 64 |
Ready = false; |
| 65 |
strcpy(orig_d64_name, filepath); |
| 66 |
for (int i=0; i<=14; i++) { |
| 67 |
chan_mode[i] = CHMOD_FREE; |
| 68 |
chan_buf[i] = NULL; |
| 69 |
} |
| 70 |
chan_mode[15] = CHMOD_COMMAND; |
| 71 |
|
| 72 |
// Open .d64 file |
| 73 |
open_close_d64_file(filepath); |
| 74 |
if (the_file != NULL) { |
| 75 |
|
| 76 |
// Allocate 1541 RAM |
| 77 |
ram = new uint8[DRIVE_RAM_SIZE]; |
| 78 |
bam = (BAM *)(ram + 0x700); |
| 79 |
|
| 80 |
Reset(); |
| 81 |
Ready = true; |
| 82 |
} |
| 83 |
} |
| 84 |
|
| 85 |
|
| 86 |
/* |
| 87 |
* Destructor |
| 88 |
*/ |
| 89 |
|
| 90 |
D64Drive::~D64Drive() |
| 91 |
{ |
| 92 |
// Close .d64 file |
| 93 |
open_close_d64_file(""); |
| 94 |
|
| 95 |
delete[] ram; |
| 96 |
Ready = false; |
| 97 |
} |
| 98 |
|
| 99 |
|
| 100 |
/* |
| 101 |
* Open/close the .d64 file |
| 102 |
*/ |
| 103 |
|
| 104 |
void D64Drive::open_close_d64_file(char *d64name) |
| 105 |
{ |
| 106 |
long size; |
| 107 |
uint8 magic[4]; |
| 108 |
|
| 109 |
// Close old .d64, if open |
| 110 |
if (the_file != NULL) { |
| 111 |
close_all_channels(); |
| 112 |
fclose(the_file); |
| 113 |
the_file = NULL; |
| 114 |
} |
| 115 |
|
| 116 |
// Open new .d64 file |
| 117 |
if (d64name[0]) { |
| 118 |
if ((the_file = fopen(d64name, "rb")) != NULL) { |
| 119 |
|
| 120 |
// Check length |
| 121 |
fseek(the_file, 0, SEEK_END); |
| 122 |
if ((size = ftell(the_file)) < NUM_SECTORS * 256) { |
| 123 |
fclose(the_file); |
| 124 |
the_file = NULL; |
| 125 |
return; |
| 126 |
} |
| 127 |
|
| 128 |
// x64 image? |
| 129 |
rewind(the_file); |
| 130 |
fread(&magic, 4, 1, the_file); |
| 131 |
if (magic[0] == 0x43 && magic[1] == 0x15 && magic[2] == 0x41 && magic[3] == 0x64) |
| 132 |
image_header = 64; |
| 133 |
else |
| 134 |
image_header = 0; |
| 135 |
|
| 136 |
// Preset error info (all sectors no error) |
| 137 |
memset(error_info, 1, NUM_SECTORS); |
| 138 |
|
| 139 |
// Load sector error info from .d64 file, if present |
| 140 |
if (!image_header && size == NUM_SECTORS * 257) { |
| 141 |
fseek(the_file, NUM_SECTORS * 256, SEEK_SET); |
| 142 |
fread(&error_info, NUM_SECTORS, 1, the_file); |
| 143 |
} |
| 144 |
} |
| 145 |
} |
| 146 |
} |
| 147 |
|
| 148 |
|
| 149 |
/* |
| 150 |
* Open channel |
| 151 |
*/ |
| 152 |
|
| 153 |
uint8 D64Drive::Open(int channel, const uint8 *name, int name_len) |
| 154 |
{ |
| 155 |
set_error(ERR_OK); |
| 156 |
|
| 157 |
// Channel 15: execute file name as command |
| 158 |
if (channel == 15) { |
| 159 |
execute_cmd(name, name_len); |
| 160 |
return ST_OK; |
| 161 |
} |
| 162 |
|
| 163 |
if (chan_mode[channel] != CHMOD_FREE) { |
| 164 |
set_error(ERR_NOCHANNEL); |
| 165 |
return ST_OK; |
| 166 |
} |
| 167 |
|
| 168 |
if (name[0] == '$') |
| 169 |
if (channel) |
| 170 |
return open_file_ts(channel, 18, 0); |
| 171 |
else |
| 172 |
return open_directory(name + 1, name_len - 1); |
| 173 |
|
| 174 |
if (name[0] == '#') |
| 175 |
return open_direct(channel, name); |
| 176 |
|
| 177 |
return open_file(channel, name, name_len); |
| 178 |
} |
| 179 |
|
| 180 |
|
| 181 |
/* |
| 182 |
* Open file |
| 183 |
*/ |
| 184 |
|
| 185 |
uint8 D64Drive::open_file(int channel, const uint8 *name, int name_len) |
| 186 |
{ |
| 187 |
uint8 plain_name[256]; |
| 188 |
int plain_name_len; |
| 189 |
int mode = FMODE_READ; |
| 190 |
int type = FTYPE_PRG; |
| 191 |
int rec_len = 0; |
| 192 |
parse_file_name(name, name_len, plain_name, plain_name_len, mode, type, rec_len); |
| 193 |
if (plain_name_len > 16) |
| 194 |
plain_name_len = 16; |
| 195 |
|
| 196 |
// Channel 0 is READ, channel 1 is WRITE |
| 197 |
if (channel == 0 || channel == 1) { |
| 198 |
mode = channel ? FMODE_WRITE : FMODE_READ; |
| 199 |
if (type == FTYPE_DEL) |
| 200 |
type = FTYPE_PRG; |
| 201 |
} |
| 202 |
|
| 203 |
// Allow only read accesses |
| 204 |
if (mode != FMODE_READ) { |
| 205 |
set_error(ERR_WRITEPROTECT); |
| 206 |
return ST_OK; |
| 207 |
} |
| 208 |
|
| 209 |
// Relative files are not supported |
| 210 |
if (type == FTYPE_REL) { |
| 211 |
set_error(ERR_UNIMPLEMENTED); |
| 212 |
return ST_OK; |
| 213 |
} |
| 214 |
|
| 215 |
// Find file in directory and open it |
| 216 |
int track, sector; |
| 217 |
if (find_file(plain_name, &track, §or)) |
| 218 |
return open_file_ts(channel, track, sector); |
| 219 |
else |
| 220 |
set_error(ERR_FILENOTFOUND); |
| 221 |
|
| 222 |
return ST_OK; |
| 223 |
} |
| 224 |
|
| 225 |
|
| 226 |
/* |
| 227 |
* Search file in directory, find first track and sector |
| 228 |
* false: not found, true: found |
| 229 |
*/ |
| 230 |
|
| 231 |
bool D64Drive::find_file(const uint8 *pattern, int *track, int *sector) |
| 232 |
{ |
| 233 |
int i, j; |
| 234 |
const uint8 *p, *q; |
| 235 |
DirEntry *de; |
| 236 |
|
| 237 |
// Scan all directory blocks |
| 238 |
dir.next_track = bam->dir_track; |
| 239 |
dir.next_sector = bam->dir_sector; |
| 240 |
|
| 241 |
while (dir.next_track) { |
| 242 |
if (!read_sector(dir.next_track, dir.next_sector, (uint8 *) &dir.next_track)) |
| 243 |
return false; |
| 244 |
|
| 245 |
// Scan all 8 entries of a block |
| 246 |
for (j=0; j<8; j++) { |
| 247 |
de = &dir.entry[j]; |
| 248 |
*track = de->track; |
| 249 |
*sector = de->sector; |
| 250 |
|
| 251 |
if (de->type) { |
| 252 |
p = pattern; |
| 253 |
q = de->name; |
| 254 |
for (i=0; i<16 && *p; i++, p++, q++) { |
| 255 |
if (*p == '*') // Wildcard '*' matches all following characters |
| 256 |
return true; |
| 257 |
if (*p != *q) { |
| 258 |
if (*p != '?') goto next_entry; // Wildcard '?' matches single character |
| 259 |
if (*q == 0xa0) goto next_entry; |
| 260 |
} |
| 261 |
} |
| 262 |
|
| 263 |
if (i == 16 || *q == 0xa0) |
| 264 |
return true; |
| 265 |
} |
| 266 |
next_entry: ; |
| 267 |
} |
| 268 |
} |
| 269 |
|
| 270 |
return false; |
| 271 |
} |
| 272 |
|
| 273 |
|
| 274 |
/* |
| 275 |
* Open file given track/sector of first block |
| 276 |
*/ |
| 277 |
|
| 278 |
uint8 D64Drive::open_file_ts(int channel, int track, int sector) |
| 279 |
{ |
| 280 |
chan_buf[channel] = new uint8[256]; |
| 281 |
chan_mode[channel] = CHMOD_FILE; |
| 282 |
|
| 283 |
// On the next call to Read, the first block will be read |
| 284 |
chan_buf[channel][0] = track; |
| 285 |
chan_buf[channel][1] = sector; |
| 286 |
buf_len[channel] = 0; |
| 287 |
|
| 288 |
return ST_OK; |
| 289 |
} |
| 290 |
|
| 291 |
|
| 292 |
/* |
| 293 |
* Prepare directory as BASIC program (channel 0) |
| 294 |
*/ |
| 295 |
|
| 296 |
const char type_char_1[] = "DSPUREERSELQGRL?"; |
| 297 |
const char type_char_2[] = "EERSELQGRL??????"; |
| 298 |
const char type_char_3[] = "LQGRL???????????"; |
| 299 |
|
| 300 |
// Return true if name 'n' matches pattern 'p' |
| 301 |
static bool match(uint8 *p, uint8 *n) |
| 302 |
{ |
| 303 |
if (!*p) // Null pattern matches everything |
| 304 |
return true; |
| 305 |
|
| 306 |
do { |
| 307 |
if (*p == '*') // Wildcard '*' matches all following characters |
| 308 |
return true; |
| 309 |
if ((*p != *n) && (*p != '?')) // Wildcard '?' matches single character |
| 310 |
return false; |
| 311 |
p++; n++; |
| 312 |
} while (*p); |
| 313 |
|
| 314 |
return *n == 0xa0; |
| 315 |
} |
| 316 |
|
| 317 |
uint8 D64Drive::open_directory(const uint8 *pattern, int pattern_len) |
| 318 |
{ |
| 319 |
// Special treatment for "$0" |
| 320 |
if (pattern[0] == '0' && pattern[1] == 0) { |
| 321 |
pattern++; |
| 322 |
pattern_len--; |
| 323 |
} |
| 324 |
|
| 325 |
// Skip everything before the ':' in the pattern |
| 326 |
uint8 *t = (uint8 *)memchr(pattern, ':', pattern_len); |
| 327 |
if (t) { |
| 328 |
t++; |
| 329 |
pattern_len -= t - pattern; |
| 330 |
pattern = t; |
| 331 |
} |
| 332 |
|
| 333 |
chan_mode[0] = CHMOD_DIRECTORY; |
| 334 |
uint8 *p = buf_ptr[0] = chan_buf[0] = new uint8[8192]; |
| 335 |
|
| 336 |
// Create directory title |
| 337 |
*p++ = 0x01; // Load address $0401 (from PET days :-) |
| 338 |
*p++ = 0x04; |
| 339 |
*p++ = 0x01; // Dummy line link |
| 340 |
*p++ = 0x01; |
| 341 |
*p++ = 0; // Drive number (0) as line number |
| 342 |
*p++ = 0; |
| 343 |
*p++ = 0x12; // RVS ON |
| 344 |
*p++ = '\"'; |
| 345 |
|
| 346 |
uint8 *q = bam->disk_name; |
| 347 |
for (int i=0; i<23; i++) { |
| 348 |
int c; |
| 349 |
if ((c = *q++) == 0xa0) |
| 350 |
*p++ = ' '; // Replace 0xa0 by space |
| 351 |
else |
| 352 |
*p++ = c; |
| 353 |
} |
| 354 |
*(p-7) = '\"'; |
| 355 |
*p++ = 0; |
| 356 |
|
| 357 |
// Scan all directory blocks |
| 358 |
dir.next_track = bam->dir_track; |
| 359 |
dir.next_sector = bam->dir_sector; |
| 360 |
|
| 361 |
while (dir.next_track) { |
| 362 |
if (!read_sector(dir.next_track, dir.next_sector, (uint8 *) &dir.next_track)) |
| 363 |
return ST_OK; |
| 364 |
|
| 365 |
// Scan all 8 entries of a block |
| 366 |
for (int j=0; j<8; j++) { |
| 367 |
DirEntry *de = &dir.entry[j]; |
| 368 |
|
| 369 |
if (de->type && match((uint8 *)pattern, de->name)) { |
| 370 |
*p++ = 0x01; // Dummy line link |
| 371 |
*p++ = 0x01; |
| 372 |
|
| 373 |
*p++ = de->num_blocks_l; // Line number |
| 374 |
*p++ = de->num_blocks_h; |
| 375 |
|
| 376 |
*p++ = ' '; |
| 377 |
int n = (de->num_blocks_h << 8) + de->num_blocks_l; |
| 378 |
if (n<10) *p++ = ' '; |
| 379 |
if (n<100) *p++ = ' '; |
| 380 |
|
| 381 |
*p++ = '\"'; |
| 382 |
q = de->name; |
| 383 |
uint8 c; |
| 384 |
int m = 0; |
| 385 |
for (int i=0; i<16; i++) { |
| 386 |
if ((c = *q++) == 0xa0) { |
| 387 |
if (m) |
| 388 |
*p++ = ' '; // Replace all 0xa0 by spaces |
| 389 |
else |
| 390 |
m = *p++ = '\"'; // But the first by a '"' |
| 391 |
} else |
| 392 |
*p++ = c; |
| 393 |
} |
| 394 |
if (m) |
| 395 |
*p++ = ' '; |
| 396 |
else |
| 397 |
*p++ = '\"'; // No 0xa0, then append a space |
| 398 |
|
| 399 |
// Open files are marked by '*' |
| 400 |
if (de->type & 0x80) |
| 401 |
*p++ = ' '; |
| 402 |
else |
| 403 |
*p++ = '*'; |
| 404 |
|
| 405 |
// File type |
| 406 |
*p++ = type_char_1[de->type & 0x0f]; |
| 407 |
*p++ = type_char_2[de->type & 0x0f]; |
| 408 |
*p++ = type_char_3[de->type & 0x0f]; |
| 409 |
|
| 410 |
// Protected files are marked by '<' |
| 411 |
if (de->type & 0x40) |
| 412 |
*p++ = '<'; |
| 413 |
else |
| 414 |
*p++ = ' '; |
| 415 |
|
| 416 |
// Appropriate number of spaces at the end |
| 417 |
*p++ = ' '; |
| 418 |
if (n >= 10) *p++ = ' '; |
| 419 |
if (n >= 100) *p++ = ' '; |
| 420 |
*p++ = 0; |
| 421 |
} |
| 422 |
} |
| 423 |
} |
| 424 |
|
| 425 |
// Final line, count number of free blocks |
| 426 |
int n = 0; |
| 427 |
for (int i=0; i<35; i++) { |
| 428 |
if (i != 17) // exclude directory track |
| 429 |
n += bam->bitmap[i*4]; |
| 430 |
} |
| 431 |
|
| 432 |
*p++ = 0x01; // Dummy line link |
| 433 |
*p++ = 0x01; |
| 434 |
*p++ = n & 0xff; // Number of free blocks as line number |
| 435 |
*p++ = (n >> 8) & 0xff; |
| 436 |
|
| 437 |
*p++ = 'B'; |
| 438 |
*p++ = 'L'; |
| 439 |
*p++ = 'O'; |
| 440 |
*p++ = 'C'; |
| 441 |
*p++ = 'K'; |
| 442 |
*p++ = 'S'; |
| 443 |
*p++ = ' '; |
| 444 |
*p++ = 'F'; |
| 445 |
*p++ = 'R'; |
| 446 |
*p++ = 'E'; |
| 447 |
*p++ = 'E'; |
| 448 |
*p++ = '.'; |
| 449 |
|
| 450 |
memset(p, ' ', 13); |
| 451 |
p += 13; |
| 452 |
|
| 453 |
*p++ = 0; |
| 454 |
*p++ = 0; |
| 455 |
*p++ = 0; |
| 456 |
|
| 457 |
buf_len[0] = p - chan_buf[0]; |
| 458 |
|
| 459 |
return ST_OK; |
| 460 |
} |
| 461 |
|
| 462 |
|
| 463 |
/* |
| 464 |
* Open channel for direct buffer access |
| 465 |
*/ |
| 466 |
|
| 467 |
uint8 D64Drive::open_direct(int channel, const uint8 *name) |
| 468 |
{ |
| 469 |
int buf = -1; |
| 470 |
|
| 471 |
if (name[1] == 0) |
| 472 |
buf = alloc_buffer(-1); |
| 473 |
else |
| 474 |
if ((name[1] >= '0') && (name[1] <= '3') && (name[2] == 0)) |
| 475 |
buf = alloc_buffer(name[1] - '0'); |
| 476 |
|
| 477 |
if (buf == -1) { |
| 478 |
set_error(ERR_NOCHANNEL); |
| 479 |
return ST_OK; |
| 480 |
} |
| 481 |
|
| 482 |
// The buffers are in the 1541 RAM at $300 and are 256 bytes each |
| 483 |
chan_buf[channel] = buf_ptr[channel] = ram + 0x300 + (buf << 8); |
| 484 |
chan_mode[channel] = CHMOD_DIRECT; |
| 485 |
chan_buf_num[channel] = buf; |
| 486 |
|
| 487 |
// Store actual buffer number in buffer |
| 488 |
*chan_buf[channel] = buf + '0'; |
| 489 |
buf_len[channel] = 1; |
| 490 |
|
| 491 |
return ST_OK; |
| 492 |
} |
| 493 |
|
| 494 |
|
| 495 |
/* |
| 496 |
* Close channel |
| 497 |
*/ |
| 498 |
|
| 499 |
uint8 D64Drive::Close(int channel) |
| 500 |
{ |
| 501 |
if (channel == 15) { |
| 502 |
close_all_channels(); |
| 503 |
return ST_OK; |
| 504 |
} |
| 505 |
|
| 506 |
switch (chan_mode[channel]) { |
| 507 |
case CHMOD_FREE: |
| 508 |
break; |
| 509 |
|
| 510 |
case CHMOD_DIRECT: |
| 511 |
free_buffer(chan_buf_num[channel]); |
| 512 |
chan_buf[channel] = NULL; |
| 513 |
chan_mode[channel] = CHMOD_FREE; |
| 514 |
break; |
| 515 |
|
| 516 |
default: |
| 517 |
delete[] chan_buf[channel]; |
| 518 |
chan_buf[channel] = NULL; |
| 519 |
chan_mode[channel] = CHMOD_FREE; |
| 520 |
break; |
| 521 |
} |
| 522 |
|
| 523 |
return ST_OK; |
| 524 |
} |
| 525 |
|
| 526 |
|
| 527 |
/* |
| 528 |
* Close all channels |
| 529 |
*/ |
| 530 |
|
| 531 |
void D64Drive::close_all_channels() |
| 532 |
{ |
| 533 |
for (int i=0; i<15; i++) |
| 534 |
Close(i); |
| 535 |
|
| 536 |
cmd_len = 0; |
| 537 |
} |
| 538 |
|
| 539 |
|
| 540 |
/* |
| 541 |
* Read from channel |
| 542 |
*/ |
| 543 |
|
| 544 |
uint8 D64Drive::Read(int channel, uint8 *byte) |
| 545 |
{ |
| 546 |
switch (chan_mode[channel]) { |
| 547 |
case CHMOD_COMMAND: |
| 548 |
*byte = *error_ptr++; |
| 549 |
if (--error_len) |
| 550 |
return ST_OK; |
| 551 |
else { |
| 552 |
set_error(ERR_OK); |
| 553 |
return ST_EOF; |
| 554 |
} |
| 555 |
break; |
| 556 |
|
| 557 |
case CHMOD_FILE: |
| 558 |
// Read next block if necessary |
| 559 |
if (chan_buf[channel][0] && !buf_len[channel]) { |
| 560 |
if (!read_sector(chan_buf[channel][0], chan_buf[channel][1], chan_buf[channel])) |
| 561 |
return ST_READ_TIMEOUT; |
| 562 |
buf_ptr[channel] = chan_buf[channel] + 2; |
| 563 |
|
| 564 |
// Determine block length |
| 565 |
buf_len[channel] = chan_buf[channel][0] ? 254 : (uint8)chan_buf[channel][1]-1; |
| 566 |
} |
| 567 |
|
| 568 |
if (buf_len[channel] > 0) { |
| 569 |
*byte = *buf_ptr[channel]++; |
| 570 |
if (!--buf_len[channel] && !chan_buf[channel][0]) |
| 571 |
return ST_EOF; |
| 572 |
else |
| 573 |
return ST_OK; |
| 574 |
} else |
| 575 |
return ST_READ_TIMEOUT; |
| 576 |
break; |
| 577 |
|
| 578 |
case CHMOD_DIRECTORY: |
| 579 |
case CHMOD_DIRECT: |
| 580 |
if (buf_len[channel] > 0) { |
| 581 |
*byte = *buf_ptr[channel]++; |
| 582 |
if (--buf_len[channel]) |
| 583 |
return ST_OK; |
| 584 |
else |
| 585 |
return ST_EOF; |
| 586 |
} else |
| 587 |
return ST_READ_TIMEOUT; |
| 588 |
break; |
| 589 |
} |
| 590 |
return ST_READ_TIMEOUT; |
| 591 |
} |
| 592 |
|
| 593 |
|
| 594 |
/* |
| 595 |
* Write byte to channel |
| 596 |
*/ |
| 597 |
|
| 598 |
uint8 D64Drive::Write(int channel, uint8 byte, bool eoi) |
| 599 |
{ |
| 600 |
switch (chan_mode[channel]) { |
| 601 |
case CHMOD_FREE: |
| 602 |
set_error(ERR_FILENOTOPEN); |
| 603 |
break; |
| 604 |
|
| 605 |
case CHMOD_COMMAND: |
| 606 |
// Collect characters and execute command on EOI |
| 607 |
if (cmd_len >= 58) |
| 608 |
return ST_TIMEOUT; |
| 609 |
|
| 610 |
cmd_buf[cmd_len++] = byte; |
| 611 |
|
| 612 |
if (eoi) { |
| 613 |
execute_cmd(cmd_buf, cmd_len); |
| 614 |
cmd_len = 0; |
| 615 |
} |
| 616 |
return ST_OK; |
| 617 |
|
| 618 |
case CHMOD_DIRECTORY: |
| 619 |
set_error(ERR_WRITEFILEOPEN); |
| 620 |
break; |
| 621 |
} |
| 622 |
return ST_TIMEOUT; |
| 623 |
} |
| 624 |
|
| 625 |
|
| 626 |
/* |
| 627 |
* Execute command string |
| 628 |
*/ |
| 629 |
|
| 630 |
// BLOCK-READ:channel,0,track,sector |
| 631 |
void D64Drive::block_read_cmd(int channel, int track, int sector, bool user_cmd) |
| 632 |
{ |
| 633 |
if (channel >= 16 || chan_mode[channel] != CHMOD_DIRECT) { |
| 634 |
set_error(ERR_NOCHANNEL); |
| 635 |
return; |
| 636 |
} |
| 637 |
read_sector(track, sector, chan_buf[channel]); |
| 638 |
if (user_cmd) { |
| 639 |
buf_len[channel] = 256; |
| 640 |
buf_ptr[channel] = chan_buf[channel]; |
| 641 |
} else { |
| 642 |
buf_len[channel] = chan_buf[channel][0]; |
| 643 |
buf_ptr[channel] = chan_buf[channel] + 1; |
| 644 |
} |
| 645 |
} |
| 646 |
|
| 647 |
// BUFFER-POINTER:channel,pos |
| 648 |
void D64Drive::buffer_pointer_cmd(int channel, int pos) |
| 649 |
{ |
| 650 |
if (channel >= 16 || chan_mode[channel] != CHMOD_DIRECT) { |
| 651 |
set_error(ERR_NOCHANNEL); |
| 652 |
return; |
| 653 |
} |
| 654 |
buf_ptr[channel] = chan_buf[channel] + pos; |
| 655 |
buf_len[channel] = 256 - pos; |
| 656 |
} |
| 657 |
|
| 658 |
// M-R<adr low><adr high>[<number>] |
| 659 |
void D64Drive::mem_read_cmd(uint16 adr, uint8 len) |
| 660 |
{ |
| 661 |
error_len = len; |
| 662 |
if (adr >= 0x300 && adr < 0x1000) { |
| 663 |
// Read from RAM |
| 664 |
error_ptr = (char *)ram + (adr & 0x7ff); |
| 665 |
} else { |
| 666 |
unsupp_cmd(); |
| 667 |
memset(error_buf, 0, len); |
| 668 |
error_ptr = error_buf; |
| 669 |
} |
| 670 |
} |
| 671 |
|
| 672 |
// M-W<adr low><adr high><number><data...> |
| 673 |
void D64Drive::mem_write_cmd(uint16 adr, uint8 len, uint8 *p) |
| 674 |
{ |
| 675 |
while (len) { |
| 676 |
if (adr >= 0x300 && adr < 0x1000) { |
| 677 |
// Write to RAM |
| 678 |
ram[adr & 0x7ff] = *p; |
| 679 |
} else if (adr < 0xc000) { |
| 680 |
unsupp_cmd(); |
| 681 |
return; |
| 682 |
} |
| 683 |
len--; adr++; p++; |
| 684 |
} |
| 685 |
} |
| 686 |
|
| 687 |
// INITIALIZE |
| 688 |
void D64Drive::initialize_cmd(void) |
| 689 |
{ |
| 690 |
// Close all channels and re-read BAM |
| 691 |
close_all_channels(); |
| 692 |
read_sector(18, 0, (uint8 *)bam); |
| 693 |
} |
| 694 |
|
| 695 |
|
| 696 |
/* |
| 697 |
* Reset drive |
| 698 |
*/ |
| 699 |
|
| 700 |
void D64Drive::Reset(void) |
| 701 |
{ |
| 702 |
close_all_channels(); |
| 703 |
|
| 704 |
read_sector(18, 0, (uint8 *)bam); |
| 705 |
|
| 706 |
cmd_len = 0; |
| 707 |
for (int i=0; i<4; i++) |
| 708 |
buf_free[i] = true; |
| 709 |
|
| 710 |
set_error(ERR_STARTUP); |
| 711 |
} |
| 712 |
|
| 713 |
|
| 714 |
/* |
| 715 |
* Allocate floppy buffer |
| 716 |
* -> Desired buffer number or -1 |
| 717 |
* <- Allocated buffer number or -1 |
| 718 |
*/ |
| 719 |
|
| 720 |
int D64Drive::alloc_buffer(int want) |
| 721 |
{ |
| 722 |
if (want == -1) { |
| 723 |
for (want=3; want>=0; want--) |
| 724 |
if (buf_free[want]) { |
| 725 |
buf_free[want] = false; |
| 726 |
return want; |
| 727 |
} |
| 728 |
return -1; |
| 729 |
} |
| 730 |
|
| 731 |
if (want < 4) |
| 732 |
if (buf_free[want]) { |
| 733 |
buf_free[want] = false; |
| 734 |
return want; |
| 735 |
} else |
| 736 |
return -1; |
| 737 |
else |
| 738 |
return -1; |
| 739 |
} |
| 740 |
|
| 741 |
|
| 742 |
/* |
| 743 |
* Free floppy buffer |
| 744 |
*/ |
| 745 |
|
| 746 |
void D64Drive::free_buffer(int buf) |
| 747 |
{ |
| 748 |
buf_free[buf] = true; |
| 749 |
} |
| 750 |
|
| 751 |
|
| 752 |
/* |
| 753 |
* Read sector (256 bytes) |
| 754 |
* true: success, false: error |
| 755 |
*/ |
| 756 |
|
| 757 |
bool D64Drive::read_sector(int track, int sector, uint8 *buffer) |
| 758 |
{ |
| 759 |
int offset; |
| 760 |
|
| 761 |
// Convert track/sector to byte offset in file |
| 762 |
if ((offset = offset_from_ts(track, sector)) < 0) { |
| 763 |
set_error(ERR_ILLEGALTS); |
| 764 |
return false; |
| 765 |
} |
| 766 |
|
| 767 |
if (the_file == NULL) { |
| 768 |
set_error(ERR_NOTREADY); |
| 769 |
return false; |
| 770 |
} |
| 771 |
|
| 772 |
#ifdef AMIGA |
| 773 |
if (offset != ftell(the_file)) |
| 774 |
fseek(the_file, offset + image_header, SEEK_SET); |
| 775 |
#else |
| 776 |
fseek(the_file, offset + image_header, SEEK_SET); |
| 777 |
#endif |
| 778 |
fread(buffer, 256, 1, the_file); |
| 779 |
return true; |
| 780 |
} |
| 781 |
|
| 782 |
|
| 783 |
/* |
| 784 |
* Convert track/sector to offset |
| 785 |
*/ |
| 786 |
|
| 787 |
const int num_sectors[41] = { |
| 788 |
0, |
| 789 |
21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21, |
| 790 |
19,19,19,19,19,19,19, |
| 791 |
18,18,18,18,18,18, |
| 792 |
17,17,17,17,17, |
| 793 |
17,17,17,17,17 // Tracks 36..40 |
| 794 |
}; |
| 795 |
|
| 796 |
const int sector_offset[41] = { |
| 797 |
0, |
| 798 |
0,21,42,63,84,105,126,147,168,189,210,231,252,273,294,315,336, |
| 799 |
357,376,395,414,433,452,471, |
| 800 |
490,508,526,544,562,580, |
| 801 |
598,615,632,649,666, |
| 802 |
683,700,717,734,751 // Tracks 36..40 |
| 803 |
}; |
| 804 |
|
| 805 |
int D64Drive::offset_from_ts(int track, int sector) |
| 806 |
{ |
| 807 |
if ((track < 1) || (track > NUM_TRACKS) || |
| 808 |
(sector < 0) || (sector >= num_sectors[track])) |
| 809 |
return -1; |
| 810 |
|
| 811 |
return (sector_offset[track] + sector) << 8; |
| 812 |
} |
