libpcsxcore/sio.c

   1 /***************************************************************************
   2  *   Copyright (C) 2007 Ryan Schultz, PCSX-df Team, PCSX team              *
   3  *                                                                         *
   4  *   This program is free software; you can redistribute it and/or modify  *
   5  *   it under the terms of the GNU General Public License as published by  *
   6  *   the Free Software Foundation; either version 2 of the License, or     *
   7  *   (at your option) any later version.                                   *
   8  *                                                                         *
   9  *   This program is distributed in the hope that it will be useful,       *
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  12  *   GNU General Public License for more details.                          *
  13  *                                                                         *
  14  *   You should have received a copy of the GNU General Public License     *
  15  *   along with this program; if not, write to the                         *
  16  *   Free Software Foundation, Inc.,                                       *
  17  *   51 Franklin Street, Fifth Floor, Boston, MA 02111-1307 USA.           *
  18  ***************************************************************************/
  19
  20 /*
  21 * SIO functions.
  22 */
  23
  24 #include "sio.h"
  25 #include <sys/stat.h>
  26
  27 // Status Flags
  28 #define TX_RDY          0x0001
  29 #define RX_RDY          0x0002
  30 #define TX_EMPTY        0x0004
  31 #define PARITY_ERR      0x0008
  32 #define RX_OVERRUN      0x0010
  33 #define FRAMING_ERR     0x0020
  34 #define SYNC_DETECT     0x0040
  35 #define DSR                     0x0080
  36 #define CTS                     0x0100
  37 #define IRQ                     0x0200
  38
  39 // Control Flags
  40 #define TX_PERM         0x0001
  41 #define DTR                     0x0002
  42 #define RX_PERM         0x0004
  43 #define BREAK           0x0008
  44 #define RESET_ERR       0x0010
  45 #define RTS                     0x0020
  46 #define SIO_RESET       0x0040
  47
  48 // *** FOR WORKS ON PADS AND MEMORY CARDS *****
  49
  50 static unsigned char buf[256];
  51 unsigned char cardh[4] = { 0x00, 0x00, 0x5a, 0x5d };
  52
  53 // Transfer Ready and the Buffer is Empty
  54 // static unsigned short StatReg = 0x002b;
  55 static unsigned short StatReg = TX_RDY | TX_EMPTY;
  56 static unsigned short ModeReg;
  57 static unsigned short CtrlReg;
  58 static unsigned short BaudReg;
  59
  60 static unsigned int bufcount;
  61 static unsigned int parp;
  62 static unsigned int mcdst, rdwr;
  63 static unsigned char adrH, adrL;
  64 static unsigned int padst;
  65
  66 char Mcd1Data[MCD_SIZE], Mcd2Data[MCD_SIZE];
  67
  68 #define SIO_INT(eCycle) { \
  69         if (!Config.Sio) { \
  70                 psxRegs.interrupt |= (1 << PSXINT_SIO); \
  71                 psxRegs.intCycle[PSXINT_SIO].cycle = eCycle; \
  72                 psxRegs.intCycle[PSXINT_SIO].sCycle = psxRegs.cycle; \
  73                 new_dyna_set_event(PSXINT_SIO, eCycle); \
  74         } \
  75 }
  76
  77 // clk cycle byte
  78 // 4us * 8bits = (PSXCLK / 1000000) * 32; (linuzappz)
  79 // TODO: add SioModePrescaler and BaudReg
  80 #define SIO_CYCLES              535
  81
  82 void sioWrite8(unsigned char value) {
  83 #ifdef PAD_LOG
  84         PAD_LOG("sio write8 %x\n", value);
  85 #endif
  86         switch (padst) {
  87                 case 1: SIO_INT(SIO_CYCLES);
  88                         if ((value & 0x40) == 0x40) {
  89                                 padst = 2; parp = 1;
  90                                 if (!Config.UseNet) {
  91                                         switch (CtrlReg & 0x2002) {
  92                                                 case 0x0002:
  93                                                         buf[parp] = PAD1_poll(value);
  94                                                         break;
  95                                                 case 0x2002:
  96                                                         buf[parp] = PAD2_poll(value);
  97                                                         break;
  98                                         }
  99                                 }/* else {
 100 //                                      SysPrintf("%x: %x, %x, %x, %x\n", CtrlReg&0x2002, buf[2], buf[3], buf[4], buf[5]);
 101                                 }*/
 102
 103                                 if (!(buf[parp] & 0x0f)) {
 104                                         bufcount = 2 + 32;
 105                                 } else {
 106                                         bufcount = 2 + (buf[parp] & 0x0f) * 2;
 107                                 }
 108                                 if (buf[parp] == 0x41) {
 109                                         switch (value) {
 110                                                 case 0x43:
 111                                                         buf[1] = 0x43;
 112                                                         break;
 113                                                 case 0x45:
 114                                                         buf[1] = 0xf3;
 115                                                         break;
 116                                         }
 117                                 }
 118                         }
 119                         else padst = 0;
 120                         return;
 121                 case 2:
 122                         parp++;
 123 /*                      if (buf[1] == 0x45) {
 124                                 buf[parp] = 0;
 125                                 SIO_INT(SIO_CYCLES);
 126                                 return;
 127                         }*/
 128                         if (!Config.UseNet) {
 129                                 switch (CtrlReg & 0x2002) {
 130                                         case 0x0002: buf[parp] = PAD1_poll(value); break;
 131                                         case 0x2002: buf[parp] = PAD2_poll(value); break;
 132                                 }
 133                         }
 134
 135                         if (parp == bufcount) { padst = 0; return; }
 136                         SIO_INT(SIO_CYCLES);
 137                         return;
 138         }
 139
 140         switch (mcdst) {
 141                 case 1:
 142                         SIO_INT(SIO_CYCLES);
 143                         if (rdwr) { parp++; return; }
 144                         parp = 1;
 145                         switch (value) {
 146                                 case 0x52: rdwr = 1; break;
 147                                 case 0x57: rdwr = 2; break;
 148                                 default: mcdst = 0;
 149                         }
 150                         return;
 151                 case 2: // address H
 152                         SIO_INT(SIO_CYCLES);
 153                         adrH = value;
 154                         *buf = 0;
 155                         parp = 0;
 156                         bufcount = 1;
 157                         mcdst = 3;
 158                         return;
 159                 case 3: // address L
 160                         SIO_INT(SIO_CYCLES);
 161                         adrL = value;
 162                         *buf = adrH;
 163                         parp = 0;
 164                         bufcount = 1;
 165                         mcdst = 4;
 166                         return;
 167                 case 4:
 168                         SIO_INT(SIO_CYCLES);
 169                         parp = 0;
 170                         switch (rdwr) {
 171                                 case 1: // read
 172                                         buf[0] = 0x5c;
 173                                         buf[1] = 0x5d;
 174                                         buf[2] = adrH;
 175                                         buf[3] = adrL;
 176                                         switch (CtrlReg & 0x2002) {
 177                                                 case 0x0002:
 178                                                         memcpy(&buf[4], Mcd1Data + (adrL | (adrH << 8)) * 128, 128);
 179                                                         break;
 180                                                 case 0x2002:
 181                                                         memcpy(&buf[4], Mcd2Data + (adrL | (adrH << 8)) * 128, 128);
 182                                                         break;
 183                                         }
 184                                         {
 185                                         char xor = 0;
 186                                         int i;
 187                                         for (i = 2; i < 128 + 4; i++)
 188                                                 xor ^= buf[i];
 189                                         buf[132] = xor;
 190                                         }
 191                                         buf[133] = 0x47;
 192                                         bufcount = 133;
 193                                         break;
 194                                 case 2: // write
 195                                         buf[0] = adrL;
 196                                         buf[1] = value;
 197                                         buf[129] = 0x5c;
 198                                         buf[130] = 0x5d;
 199                                         buf[131] = 0x47;
 200                                         bufcount = 131;
 201                                         break;
 202                         }
 203                         mcdst = 5;
 204                         return;
 205                 case 5:
 206                         parp++;
 207                         if (rdwr == 2) {
 208                                 if (parp < 128) buf[parp + 1] = value;
 209                         }
 210                         SIO_INT(SIO_CYCLES);
 211                         return;
 212         }
 213
 214         switch (value) {
 215                 case 0x01: // start pad
 216                         StatReg |= RX_RDY;              // Transfer is Ready
 217
 218                         if (!Config.UseNet) {
 219                                 switch (CtrlReg & 0x2002) {
 220                                         case 0x0002: buf[0] = PAD1_startPoll(1); break;
 221                                         case 0x2002: buf[0] = PAD2_startPoll(2); break;
 222                                 }
 223                         } else {
 224                                 if ((CtrlReg & 0x2002) == 0x0002) {
 225                                         int i, j;
 226
 227                                         PAD1_startPoll(1);
 228                                         buf[0] = 0;
 229                                         buf[1] = PAD1_poll(0x42);
 230                                         if (!(buf[1] & 0x0f)) {
 231                                                 bufcount = 32;
 232                                         } else {
 233                                                 bufcount = (buf[1] & 0x0f) * 2;
 234                                         }
 235                                         buf[2] = PAD1_poll(0);
 236                                         i = 3;
 237                                         j = bufcount;
 238                                         while (j--) {
 239                                                 buf[i++] = PAD1_poll(0);
 240                                         }
 241                                         bufcount+= 3;
 242
 243                                         if (NET_sendPadData(buf, bufcount) == -1)
 244                                                 netError();
 245
 246                                         if (NET_recvPadData(buf, 1) == -1)
 247                                                 netError();
 248                                         if (NET_recvPadData(buf + 128, 2) == -1)
 249                                                 netError();
 250                                 } else {
 251                                         memcpy(buf, buf + 128, 32);
 252                                 }
 253                         }
 254
 255                         bufcount = 2;
 256                         parp = 0;
 257                         padst = 1;
 258                         SIO_INT(SIO_CYCLES);
 259                         return;
 260                 case 0x81: // start memcard
 261                         StatReg |= RX_RDY;
 262                         memcpy(buf, cardh, 4);
 263                         parp = 0;
 264                         bufcount = 3;
 265                         mcdst = 1;
 266                         rdwr = 0;
 267                         SIO_INT(SIO_CYCLES);
 268                         return;
 269         }
 270 }
 271
 272 void sioWriteStat16(unsigned short value) {
 273 }
 274
 275 void sioWriteMode16(unsigned short value) {
 276         ModeReg = value;
 277 }
 278
 279 void sioWriteCtrl16(unsigned short value) {
 280         CtrlReg = value & ~RESET_ERR;
 281         if (value & RESET_ERR) StatReg &= ~IRQ;
 282         if ((CtrlReg & SIO_RESET) || (!CtrlReg)) {
 283                 padst = 0; mcdst = 0; parp = 0;
 284                 StatReg = TX_RDY | TX_EMPTY;
 285                 psxRegs.interrupt &= ~(1 << PSXINT_SIO);
 286         }
 287 }
 288
 289 void sioWriteBaud16(unsigned short value) {
 290         BaudReg = value;
 291 }
 292
 293 unsigned char sioRead8() {
 294         unsigned char ret = 0;
 295
 296         if ((StatReg & RX_RDY)/* && (CtrlReg & RX_PERM)*/) {
 297 //              StatReg &= ~RX_OVERRUN;
 298                 ret = buf[parp];
 299                 if (parp == bufcount) {
 300                         StatReg &= ~RX_RDY;             // Receive is not Ready now
 301                         if (mcdst == 5) {
 302                                 mcdst = 0;
 303                                 if (rdwr == 2) {
 304                                         switch (CtrlReg & 0x2002) {
 305                                                 case 0x0002:
 306                                                         memcpy(Mcd1Data + (adrL | (adrH << 8)) * 128, &buf[1], 128);
 307                                                         SaveMcd(Config.Mcd1, Mcd1Data, (adrL | (adrH << 8)) * 128, 128);
 308                                                         break;
 309                                                 case 0x2002:
 310                                                         memcpy(Mcd2Data + (adrL | (adrH << 8)) * 128, &buf[1], 128);
 311                                                         SaveMcd(Config.Mcd2, Mcd2Data, (adrL | (adrH << 8)) * 128, 128);
 312                                                         break;
 313                                         }
 314                                 }
 315                         }
 316                         if (padst == 2) padst = 0;
 317                         if (mcdst == 1) {
 318                                 mcdst = 2;
 319                                 StatReg|= RX_RDY;
 320                         }
 321                 }
 322         }
 323
 324 #ifdef PAD_LOG
 325         PAD_LOG("sio read8 ;ret = %x\n", ret);
 326 #endif
 327         return ret;
 328 }
 329
 330 unsigned short sioReadStat16() {
 331         return StatReg;
 332 }
 333
 334 unsigned short sioReadMode16() {
 335         return ModeReg;
 336 }
 337
 338 unsigned short sioReadCtrl16() {
 339         return CtrlReg;
 340 }
 341
 342 unsigned short sioReadBaud16() {
 343         return BaudReg;
 344 }
 345
 346 void netError() {
 347         ClosePlugins();
 348         SysMessage(_("Connection closed!\n"));
 349
 350         CdromId[0] = '\0';
 351         CdromLabel[0] = '\0';
 352
 353         SysRunGui();
 354 }
 355
 356 void sioInterrupt() {
 357 #ifdef PAD_LOG
 358         PAD_LOG("Sio Interrupt (CP0.Status = %x)\n", psxRegs.CP0.n.Status);
 359 #endif
 360 //      SysPrintf("Sio Interrupt\n");
 361         StatReg |= IRQ;
 362         psxHu32ref(0x1070) |= SWAPu32(0x80);
 363 }
 364
 365 void LoadMcd(int mcd, char *str) {
 366         FILE *f;
 367         char *data = NULL;
 368
 369         if (mcd == 1) data = Mcd1Data;
 370         if (mcd == 2) data = Mcd2Data;
 371
 372         if (*str == 0) {
 373                 sprintf(str, "memcards/card%d.mcd", mcd);
 374                 SysPrintf(_("No memory card value was specified - creating a default card %s\n"), str);
 375         }
 376         f = fopen(str, "rb");
 377         if (f == NULL) {
 378                 SysPrintf(_("The memory card %s doesn't exist - creating it\n"), str);
 379                 CreateMcd(str);
 380                 f = fopen(str, "rb");
 381                 if (f != NULL) {
 382                         struct stat buf;
 383
 384                         if (stat(str, &buf) != -1) {
 385                                 if (buf.st_size == MCD_SIZE + 64)
 386                                         fseek(f, 64, SEEK_SET);
 387                                 else if(buf.st_size == MCD_SIZE + 3904)
 388                                         fseek(f, 3904, SEEK_SET);
 389                         }
 390                         fread(data, 1, MCD_SIZE, f);
 391                         fclose(f);
 392                 }
 393                 else
 394                         SysMessage(_("Memory card %s failed to load!\n"), str);
 395         }
 396         else {
 397                 struct stat buf;
 398                 SysPrintf(_("Loading memory card %s\n"), str);
 399                 if (stat(str, &buf) != -1) {
 400                         if (buf.st_size == MCD_SIZE + 64)
 401                                 fseek(f, 64, SEEK_SET);
 402                         else if(buf.st_size == MCD_SIZE + 3904)
 403                                 fseek(f, 3904, SEEK_SET);
 404                 }
 405                 fread(data, 1, MCD_SIZE, f);
 406                 fclose(f);
 407         }
 408 }
 409
 410 void LoadMcds(char *mcd1, char *mcd2) {
 411         LoadMcd(1, mcd1);
 412         LoadMcd(2, mcd2);
 413 }
 414
 415 void SaveMcd(char *mcd, char *data, uint32_t adr, int size) {
 416         FILE *f;
 417
 418         f = fopen(mcd, "r+b");
 419         if (f != NULL) {
 420                 struct stat buf;
 421
 422                 if (stat(mcd, &buf) != -1) {
 423                         if (buf.st_size == MCD_SIZE + 64)
 424                                 fseek(f, adr + 64, SEEK_SET);
 425                         else if (buf.st_size == MCD_SIZE + 3904)
 426                                 fseek(f, adr + 3904, SEEK_SET);
 427                         else
 428                                 fseek(f, adr, SEEK_SET);
 429                 } else
 430                         fseek(f, adr, SEEK_SET);
 431
 432                 fwrite(data + adr, 1, size, f);
 433                 fclose(f);
 434                 return;
 435         }
 436
 437 #if 0
 438         // try to create it again if we can't open it
 439         f = fopen(mcd, "wb");
 440         if (f != NULL) {
 441                 fwrite(data, 1, MCD_SIZE, f);
 442                 fclose(f);
 443         }
 444 #endif
 445
 446         ConvertMcd(mcd, data);
 447 }
 448
 449 void CreateMcd(char *mcd) {
 450         FILE *f;
 451         struct stat buf;
 452         int s = MCD_SIZE;
 453         int i = 0, j;
 454
 455         f = fopen(mcd, "wb");
 456         if (f == NULL)
 457                 return;
 458
 459         if (stat(mcd, &buf) != -1) {
 460                 if ((buf.st_size == MCD_SIZE + 3904) || strstr(mcd, ".gme")) {
 461                         s = s + 3904;
 462                         fputc('1', f);
 463                         s--;
 464                         fputc('2', f);
 465                         s--;
 466                         fputc('3', f);
 467                         s--;
 468                         fputc('-', f);
 469                         s--;
 470                         fputc('4', f);
 471                         s--;
 472                         fputc('5', f);
 473                         s--;
 474                         fputc('6', f);
 475                         s--;
 476                         fputc('-', f);
 477                         s--;
 478                         fputc('S', f);
 479                         s--;
 480                         fputc('T', f);
 481                         s--;
 482                         fputc('D', f);
 483                         s--;
 484                         for (i = 0; i < 7; i++) {
 485                                 fputc(0, f);
 486                                 s--;
 487                         }
 488                         fputc(1, f);
 489                         s--;
 490                         fputc(0, f);
 491                         s--;
 492                         fputc(1, f);
 493                         s--;
 494                         fputc('M', f);
 495                         s--;
 496                         fputc('Q', f);
 497                         s--;
 498                         for (i = 0; i < 14; i++) {
 499                                 fputc(0xa0, f);
 500                                 s--;
 501                         }
 502                         fputc(0, f);
 503                         s--;
 504                         fputc(0xff, f);
 505                         while (s-- > (MCD_SIZE + 1))
 506                                 fputc(0, f);
 507                 } else if ((buf.st_size == MCD_SIZE + 64) || strstr(mcd, ".mem") || strstr(mcd, ".vgs")) {
 508                         s = s + 64;
 509                         fputc('V', f);
 510                         s--;
 511                         fputc('g', f);
 512                         s--;
 513                         fputc('s', f);
 514                         s--;
 515                         fputc('M', f);
 516                         s--;
 517                         for (i = 0; i < 3; i++) {
 518                                 fputc(1, f);
 519                                 s--;
 520                                 fputc(0, f);
 521                                 s--;
 522                                 fputc(0, f);
 523                                 s--;
 524                                 fputc(0, f);
 525                                 s--;
 526                         }
 527                         fputc(0, f);
 528                         s--;
 529                         fputc(2, f);
 530                         while (s-- > (MCD_SIZE + 1))
 531                                 fputc(0, f);
 532                 }
 533         }
 534         fputc('M', f);
 535         s--;
 536         fputc('C', f);
 537         s--;
 538         while (s-- > (MCD_SIZE - 127))
 539                 fputc(0, f);
 540         fputc(0xe, f);
 541         s--;
 542
 543         for (i = 0; i < 15; i++) { // 15 blocks
 544                 fputc(0xa0, f);
 545                 s--;
 546                 fputc(0x00, f);
 547                 s--;
 548                 fputc(0x00, f);
 549                 s--;
 550                 fputc(0x00, f);
 551                 s--;
 552                 fputc(0x00, f);
 553                 s--;
 554                 fputc(0x00, f);
 555                 s--;
 556                 fputc(0x00, f);
 557                 s--;
 558                 fputc(0x00, f);
 559                 s--;
 560                 fputc(0xff, f);
 561                 s--;
 562                 fputc(0xff, f);
 563                 s--;
 564                 for (j = 0; j < 117; j++) {
 565                         fputc(0x00, f);
 566                         s--;
 567                 }
 568                 fputc(0xa0, f);
 569                 s--;
 570         }
 571
 572         for (i = 0; i < 20; i++) {
 573                 fputc(0xff, f);
 574                 s--;
 575                 fputc(0xff, f);
 576                 s--;
 577                 fputc(0xff, f);
 578                 s--;
 579                 fputc(0xff, f);
 580                 s--;
 581                 fputc(0x00, f);
 582                 s--;
 583                 fputc(0x00, f);
 584                 s--;
 585                 fputc(0x00, f);
 586                 s--;
 587                 fputc(0x00, f);
 588                 s--;
 589                 fputc(0xff, f);
 590                 s--;
 591                 fputc(0xff, f);
 592                 s--;
 593                 for (j = 0; j < 118; j++) {
 594                         fputc(0x00, f);
 595                         s--;
 596                 }
 597         }
 598
 599         while ((s--) >= 0)
 600                 fputc(0, f);
 601
 602         fclose(f);
 603 }
 604
 605 void ConvertMcd(char *mcd, char *data) {
 606         FILE *f;
 607         int i = 0;
 608         int s = MCD_SIZE;
 609
 610         if (strstr(mcd, ".gme")) {
 611                 f = fopen(mcd, "wb");
 612                 if (f != NULL) {
 613                         fwrite(data - 3904, 1, MCD_SIZE + 3904, f);
 614                         fclose(f);
 615                 }
 616                 f = fopen(mcd, "r+");
 617                 s = s + 3904;
 618                 fputc('1', f); s--;
 619                 fputc('2', f); s--;
 620                 fputc('3', f); s--;
 621                 fputc('-', f); s--;
 622                 fputc('4', f); s--;
 623                 fputc('5', f); s--;
 624                 fputc('6', f); s--;
 625                 fputc('-', f); s--;
 626                 fputc('S', f); s--;
 627                 fputc('T', f); s--;
 628                 fputc('D', f); s--;
 629                 for (i = 0; i < 7; i++) {
 630                         fputc(0, f); s--;
 631                 }
 632                 fputc(1, f); s--;
 633                 fputc(0, f); s--;
 634                 fputc(1, f); s--;
 635                 fputc('M', f); s--;
 636                 fputc('Q', f); s--;
 637                 for(i=0;i<14;i++) {
 638                         fputc(0xa0, f); s--;
 639                 }
 640                 fputc(0, f); s--;
 641                 fputc(0xff, f);
 642                 while (s-- > (MCD_SIZE+1)) fputc(0, f);
 643                 fclose(f);
 644         } else if(strstr(mcd, ".mem") || strstr(mcd,".vgs")) {
 645                 f = fopen(mcd, "wb");
 646                 if (f != NULL) {
 647                         fwrite(data-64, 1, MCD_SIZE+64, f);
 648                         fclose(f);
 649                 }
 650                 f = fopen(mcd, "r+");
 651                 s = s + 64;
 652                 fputc('V', f); s--;
 653                 fputc('g', f); s--;
 654                 fputc('s', f); s--;
 655                 fputc('M', f); s--;
 656                 for(i=0;i<3;i++) {
 657                         fputc(1, f); s--;
 658                         fputc(0, f); s--;
 659                         fputc(0, f); s--;
 660                         fputc(0, f); s--;
 661                 }
 662                 fputc(0, f); s--;
 663                 fputc(2, f);
 664                 while (s-- > (MCD_SIZE+1)) fputc(0, f);
 665                 fclose(f);
 666         } else {
 667                 f = fopen(mcd, "wb");
 668                 if (f != NULL) {
 669                         fwrite(data, 1, MCD_SIZE, f);
 670                         fclose(f);
 671                 }
 672         }
 673 }
 674
 675 void GetMcdBlockInfo(int mcd, int block, McdBlock *Info) {
 676         char *data = NULL, *ptr, *str, *sstr;
 677         unsigned short clut[16];
 678         unsigned short c;
 679         int i, x;
 680
 681         memset(Info, 0, sizeof(McdBlock));
 682
 683         if (mcd == 1) data = Mcd1Data;
 684         if (mcd == 2) data = Mcd2Data;
 685
 686         ptr = data + block * 8192 + 2;
 687
 688         Info->IconCount = *ptr & 0x3;
 689
 690         ptr += 2;
 691
 692         x = 0;
 693
 694         str = Info->Title;
 695         sstr = Info->sTitle;
 696
 697         for (i = 0; i < 48; i++) {
 698                 c = *(ptr) << 8;
 699                 c |= *(ptr + 1);
 700                 if (!c) break;
 701
 702                 // Convert ASCII characters to half-width
 703                 if (c >= 0x8281 && c <= 0x829A)
 704                         c = (c - 0x8281) + 'a';
 705                 else if (c >= 0x824F && c <= 0x827A)
 706                         c = (c - 0x824F) + '0';
 707                 else if (c == 0x8140) c = ' ';
 708                 else if (c == 0x8143) c = ',';
 709                 else if (c == 0x8144) c = '.';
 710                 else if (c == 0x8146) c = ':';
 711                 else if (c == 0x8147) c = ';';
 712                 else if (c == 0x8148) c = '?';
 713                 else if (c == 0x8149) c = '!';
 714                 else if (c == 0x815E) c = '/';
 715                 else if (c == 0x8168) c = '"';
 716                 else if (c == 0x8169) c = '(';
 717                 else if (c == 0x816A) c = ')';
 718                 else if (c == 0x816D) c = '[';
 719                 else if (c == 0x816E) c = ']';
 720                 else if (c == 0x817C) c = '-';
 721                 else {
 722                         str[i] = ' ';
 723                         sstr[x++] = *ptr++; sstr[x++] = *ptr++;
 724                         continue;
 725                 }
 726
 727                 str[i] = sstr[x++] = c;
 728                 ptr += 2;
 729         }
 730
 731         trim(str);
 732         trim(sstr);
 733
 734         ptr = data + block * 8192 + 0x60; // icon palette data
 735
 736         for (i = 0; i < 16; i++) {
 737                 clut[i] = *((unsigned short *)ptr);
 738                 ptr += 2;
 739         }
 740
 741         for (i = 0; i < Info->IconCount; i++) {
 742                 short *icon = &Info->Icon[i * 16 * 16];
 743
 744                 ptr = data + block * 8192 + 128 + 128 * i; // icon data
 745
 746                 for (x = 0; x < 16 * 16; x++) {
 747                         icon[x++] = clut[*ptr & 0xf];
 748                         icon[x] = clut[*ptr >> 4];
 749                         ptr++;
 750                 }
 751         }
 752
 753         ptr = data + block * 128;
 754
 755         Info->Flags = *ptr;
 756
 757         ptr += 0xa;
 758         strncpy(Info->ID, ptr, 12);
 759         ptr += 12;
 760         strncpy(Info->Name, ptr, 16);
 761 }
 762
 763 int sioFreeze(gzFile f, int Mode) {
 764         gzfreeze(buf, sizeof(buf));
 765         gzfreeze(&StatReg, sizeof(StatReg));
 766         gzfreeze(&ModeReg, sizeof(ModeReg));
 767         gzfreeze(&CtrlReg, sizeof(CtrlReg));
 768         gzfreeze(&BaudReg, sizeof(BaudReg));
 769         gzfreeze(&bufcount, sizeof(bufcount));
 770         gzfreeze(&parp, sizeof(parp));
 771         gzfreeze(&mcdst, sizeof(mcdst));
 772         gzfreeze(&rdwr, sizeof(rdwr));
 773         gzfreeze(&adrH, sizeof(adrH));
 774         gzfreeze(&adrL, sizeof(adrL));
 775         gzfreeze(&padst, sizeof(padst));
 776
 777         return 0;
 778 }