source/src/vm/bmjr/memory.cpp

   1 /*
   2         HITACH BASIC Master Jr Emulator 'eBASICMasterJr'
   3
   4         Author : Takeda.Toshiya
   5         Date   : 2015.08.28-
   6
   7         [ memory bus ]
   8 */
   9
  10 #include "memory.h"
  11 #include "../datarec.h"
  12
  13 #define SET_BANK(s, e, w, r) { \
  14         int sb = (s) >> 11, eb = (e) >> 11; \
  15         for(int i = sb; i <= eb; i++) { \
  16                 if((w) == wdmy) { \
  17                         wbank[i] = wdmy; \
  18                 } else { \
  19                         wbank[i] = (w) + 0x800 * (i - sb); \
  20                 } \
  21                 if((r) == rdmy) { \
  22                         rbank[i] = rdmy; \
  23                 } else { \
  24                         rbank[i] = (r) + 0x800 * (i - sb); \
  25                 } \
  26         } \
  27 }
  28
  29 #define SOUND_VOLUME    8000
  30
  31 static const int key_table[13][4] = {
  32         {0x5a, 0x41, 0x51, 0x31},       //      'Z'     'A'     'Q'     '1'
  33         {0x58, 0x53, 0x57, 0x32},       //      'X'     'S'     'W'     '2'
  34         {0x43, 0x44, 0x45, 0x33},       //      'C'     'D'     'E'     '3'
  35         {0x56, 0x46, 0x52, 0x34},       //      'V'     'F'     'R'     '4'
  36         {0x42, 0x47, 0x54, 0x35},       //      'B'     'G'     'T'     '5'
  37         {0x4e, 0x48, 0x59, 0x36},       //      'N'     'H'     'Y'     '6'
  38         {0x4d, 0x4a, 0x55, 0x37},       //      'M'     'J'     'U'     '7'
  39         {0xbc, 0x4b, 0x49, 0x38},       //      ','     'K'     'I'     '8'
  40         {0xbe, 0x4c, 0x4f, 0x39},       //      '.'     'L'     'O'     '9'
  41         {0xbf, 0xbb, 0x50, 0x30},       //      '/'     ';'     'P'     '0'
  42         {0xe2, 0xba, 0xc0, 0xbd},       //      '_'     ':'     '@'     '-'
  43         {0x20, 0xdd, 0xdb, 0xde},       //      SPACE   ']'     '['     '^'
  44         {0x00, 0x0d, 0x2e, 0xdc},       //              RETURN  DEL     '\'
  45 };
  46
  47 void MEMORY::initialize()
  48 {
  49         // initialize memory
  50         memset(ram, 0, sizeof(ram));
  51         memset(basic, 0xff, sizeof(basic));
  52         memset(printer, 0xff, sizeof(printer));
  53         memset(monitor, 0xff, sizeof(monitor));
  54         memset(rdmy, 0xff, sizeof(rdmy));
  55
  56         // load rom images
  57         FILEIO* fio = new FILEIO();
  58         if(fio->Fopen(create_local_path(_T("BASIC.ROM")), FILEIO_READ_BINARY)) {
  59                 fio->Fread(basic, sizeof(basic), 1);
  60                 fio->Fclose();
  61         } else if(fio->Fopen(create_local_path(_T("BAS.ROM")), FILEIO_READ_BINARY)) {
  62                 fio->Fread(basic, sizeof(basic), 1);
  63                 fio->Fclose();
  64         }
  65         if(fio->Fopen(create_local_path(_T("PRINTER.ROM")), FILEIO_READ_BINARY)) {
  66                 fio->Fread(printer, sizeof(printer), 1);
  67                 fio->Fclose();
  68         } else if(fio->Fopen(create_local_path(_T("PRT.ROM")), FILEIO_READ_BINARY)) {
  69                 fio->Fread(printer, sizeof(printer), 1);
  70                 fio->Fclose();
  71         }
  72         if(fio->Fopen(create_local_path(_T("MONITOR.ROM")), FILEIO_READ_BINARY)) {
  73                 fio->Fread(monitor, sizeof(monitor), 1);
  74                 fio->Fclose();
  75         } else if(fio->Fopen(create_local_path(_T("MON.ROM")), FILEIO_READ_BINARY)) {
  76                 fio->Fread(monitor, sizeof(monitor), 1);
  77                 fio->Fclose();
  78         }
  79         if(fio->Fopen(create_local_path(_T("FONT.ROM")), FILEIO_READ_BINARY)) {
  80                 fio->Fread(font, sizeof(font), 1);
  81                 fio->Fclose();
  82         }
  83         delete fio;
  84
  85         SET_BANK(0x0000, 0xafff, ram,  ram);
  86         memory_bank = 0;
  87         update_bank();
  88
  89         // initialize inputs
  90         key_stat = emu->get_key_buffer();
  91
  92         // initialize display
  93         for(int i = 0; i < 8; i++) {
  94                 palette_pc[i] = RGB_COLOR((i & 2) ? 0xff : 0, (i & 4) ? 0xff : 0, (i & 1) ? 0xff : 0);
  95         }
  96
  97         // register event
  98         register_frame_event(this);
  99 }
 100
 101 void MEMORY::reset()
 102 {
 103         memory_bank = 0;
 104         update_bank();
 105
 106         memset(color_table, 7, sizeof(color_table));
 107         char_color = 7;
 108         back_color = mp1710_enb = 0;
 109
 110         screen_mode = 0;
 111         screen_reversed = false;
 112
 113         drec_in = false;
 114
 115         key_column = 0;
 116         nmi_enb = break_pressed = false;
 117
 118         sound_sample = 0;
 119         sound_accum = 0;
 120         sound_clock = sound_mix_clock = get_current_clock();
 121 }
 122
 123 void MEMORY::write_data8(uint32_t addr, uint32_t data)
 124 {
 125         if((addr & 0xfe00) == 0xee00) {
 126                 // EE00h - EFFFh
 127                 switch(addr & 0xffff) {
 128                 case 0xee40:
 129                         screen_reversed = ((data & 0x80) != 0);
 130                         break;
 131                 case 0xee80:
 132                         if(sound_sample != ((data >> 1) & 0x1f)) {
 133                                 sound_accum += (double)sound_sample * get_passed_usec(sound_clock);
 134                                 sound_clock = get_current_clock();
 135                                 sound_sample = (data >> 1) & 0x1f;
 136                         }
 137                         d_drec->write_signal(SIG_DATAREC_MIC, ~data, 0x01);
 138                         break;
 139                 case 0xeec0:
 140                         key_column = data & 0x0f;
 141                         nmi_enb = ((data & 0x80) != 0);
 142                         event_frame(); // update keyboard
 143                         break;
 144                 case 0xefd0:
 145                         // bit4: unknown (timer on/off)
 146                         memory_bank = data;
 147                         update_bank();
 148                         break;
 149                 case 0xefe0:
 150                         screen_mode = data;
 151                         break;
 152                 }
 153                 return;
 154         }
 155         if((addr & 0xf800) == 0xe800 && !(memory_bank & 2)) {
 156                 // E800h - EDFFh
 157                 switch(addr & 0xffff) {
 158                 case 0xe800:
 159                 case 0xe801:
 160                 case 0xe802:
 161                 case 0xe803:
 162                         d_pia->write_io8(addr, data);
 163                         break;
 164                 case 0xe890:
 165                         // bit0-3: fore color
 166                         // bit4-7: back color
 167                         char_color = data;
 168                         break;
 169                 case 0xe891:
 170                         back_color = data;
 171                         break;
 172                 case 0xe892:
 173                         mp1710_enb = data;
 174                         break;
 175                 }
 176                 return;
 177         }
 178         if(addr >= 0x100 && addr < 0x400) {
 179                 color_table[addr - 0x100] = char_color;
 180         }
 181         wbank[(addr >> 11) & 0x1f][addr & 0x7ff] = data;
 182 }
 183
 184 uint32_t MEMORY::read_data8(uint32_t addr)
 185 {
 186         if((addr & 0xfe00) == 0xee00) {
 187                 // EE00h - EFFFh
 188                 switch(addr & 0xffff) {
 189                 case 0xee00:
 190                 case 0xee20:
 191                         d_drec->write_signal(SIG_DATAREC_REMOTE, addr, 0x20);
 192                         return 0x01;
 193                 case 0xee80:
 194                         return drec_in ? 0x80 : 0;
 195                 case 0xeec0:
 196                         return key_data;
 197                 case 0xef00:
 198                         // unknown (timer)
 199                         break;
 200                 case 0xef80:
 201                         if(break_pressed) {
 202                                 break_pressed = false;
 203                                 return 0x80;
 204                         }
 205                         return 0x00;
 206                 case 0xefd0:
 207                         return memory_bank;
 208                 }
 209                 return 0xff;
 210         }
 211         if((addr & 0xf800) == 0xe800 && !(memory_bank & 2)) {
 212                 // E800h - EDFFh
 213                 switch(addr & 0xffff) {
 214                 case 0xe800:
 215                 case 0xe801:
 216                 case 0xe802:
 217                 case 0xe803:
 218                         return d_pia->read_io8(addr);
 219                 case 0xe890:
 220                         return char_color;
 221                 case 0xe891:
 222                         return back_color;
 223                 case 0xe892:
 224                         return mp1710_enb;
 225                 }
 226                 return 0xff;
 227         }
 228         return rbank[(addr >> 11) & 0x1f][addr & 0x7ff];
 229 }
 230
 231 void MEMORY::write_signal(int id, uint32_t data, uint32_t mask)
 232 {
 233         if(id == SIG_MEMORY_DATAREC_EAR) {
 234                 drec_in = ((data & mask) != 0);
 235         }
 236 }
 237
 238 void MEMORY::event_frame()
 239 {
 240         key_data = 0xff;
 241         if(key_column < 13) {
 242                 if(key_stat[key_table[key_column][0]]) key_data &= ~0x01;
 243                 if(key_stat[key_table[key_column][1]]) key_data &= ~0x02;
 244                 if(key_stat[key_table[key_column][2]]) key_data &= ~0x04;
 245                 if(key_stat[key_table[key_column][3]]) key_data &= ~0x08;
 246         }
 247         // this is same as "\93ú\97§\83x\81[\83V\83b\83N\83}\83X\83^\81[Jr.(MB-6885)\83G\83~\83\85\83\8c\81[\83^ bm2"
 248         if(key_stat[0xa2]) key_data &= ~0x10; // \89p\90\94     -> L-CTRL
 249         if(key_stat[0xa0]) key_data &= ~0x20; // \89p\8bL\8d\86   -> L-SHIFT
 250         if(key_stat[0xa1]) key_data &= ~0x40; // \83J\83i\8bL\8d\86 -> R-SHIFT
 251         if(key_stat[0xa3]) key_data &= ~0x80; // \83J\83i     -> R-CTRL
 252 }
 253
 254 void MEMORY::key_down(int code)
 255 {
 256         // pause -> break
 257         if(code == 0x13) {
 258                 if(nmi_enb) {
 259                         d_cpu->write_signal(SIG_CPU_NMI, 1, 1);
 260                 }
 261                 break_pressed = true;
 262         }
 263 }
 264
 265 void MEMORY::update_bank()
 266 {
 267         if(memory_bank & 1) {
 268                 SET_BANK(0xb000, 0xdfff, ram + 0xb000, ram + 0xb000);
 269         } else {
 270                 SET_BANK(0xb000, 0xdfff, wdmy, basic);
 271         }
 272         if(memory_bank & 2) {
 273                 SET_BANK(0xe000, 0xefff, ram + 0xe000, ram + 0xe000);
 274         } else {
 275                 SET_BANK(0xe000, 0xe7ff, wdmy, printer);
 276                 SET_BANK(0xe800, 0xefff, wdmy, rdmy);   // memory mapped i/o
 277         }
 278         if(memory_bank & 4) {
 279                 SET_BANK(0xf000, 0xffff, ram + 0xf000, ram + 0xf000);
 280         } else {
 281                 SET_BANK(0xf000, 0xffff, wdmy, monitor);
 282         }
 283 }
 284
 285 void MEMORY::mix(int32_t* buffer, int cnt)
 286 {
 287         int32_t volume = 0;
 288         if(get_passed_clock(sound_mix_clock) != 0) {
 289                 sound_accum += (double)sound_sample * get_passed_usec(sound_clock);
 290                 volume = (int32_t)(SOUND_VOLUME * sound_accum / (31.0 * get_passed_usec(sound_mix_clock)));
 291         }
 292         sound_accum = 0;
 293         sound_clock = sound_mix_clock = get_current_clock();
 294
 295         for(int i = 0; i < cnt; i++) {
 296                 *buffer++ = apply_volume(volume, volume_l); // L
 297                 *buffer++ = apply_volume(volume, volume_r); // R
 298         }
 299 }
 300
 301 void MEMORY::set_volume(int ch, int decibel_l, int decibel_r)
 302 {
 303         volume_l = decibel_to_volume(decibel_l);
 304         volume_r = decibel_to_volume(decibel_r);
 305 }
 306
 307 void MEMORY::draw_screen()
 308 {
 309         if(!(screen_mode & 0x80)) {
 310                 // text
 311                 scrntype_t fore = palette_pc[screen_reversed ? 0 : 7];
 312                 scrntype_t back = palette_pc[screen_reversed ? 7 : 0];
 313                 int taddr = 0x100;
 314
 315                 for(int y = 0, yy = 0; y < 24; y++, yy += 8) {
 316                         for(int x = 0, xx = 0; x < 32; x++, xx += 8) {
 317                                 if(mp1710_enb & 1) {
 318                                         uint8_t color = color_table[taddr];
 319                                         if(screen_reversed) {
 320                                                 color = (color >> 4) | (color << 4);
 321                                         }
 322                                         fore = palette_pc[(color     ) & 7];
 323                                         back = palette_pc[(color >> 4) & 7];
 324                                 }
 325                                 int code = ram[taddr] << 3;
 326                                 for(int l = 0; l < 8; l++) {
 327                                         scrntype_t* dest = emu->get_screen_buffer(yy + l) + xx;
 328                                         uint8_t pat = font[code + l];
 329                                         dest[0] = (pat & 0x80) ? fore : back;
 330                                         dest[1] = (pat & 0x40) ? fore : back;
 331                                         dest[2] = (pat & 0x20) ? fore : back;
 332                                         dest[3] = (pat & 0x10) ? fore : back;
 333                                         dest[4] = (pat & 0x08) ? fore : back;
 334                                         dest[5] = (pat & 0x04) ? fore : back;
 335                                         dest[6] = (pat & 0x02) ? fore : back;
 336                                         dest[7] = (pat & 0x01) ? fore : back;
 337                                 }
 338                                 taddr++;
 339                         }
 340                 }
 341         } else {
 342                 // graph
 343                 scrntype_t fore = palette_pc[screen_reversed ? 0 : 7];
 344                 scrntype_t back = palette_pc[screen_reversed ? 7 : 0];
 345                 int taddr = 0x100;
 346                 int gaddr = 0x900 + ((screen_mode & 0x0f) << 9);
 347
 348                 for(int y = 0, yy = 0; y < 24; y++, yy += 8) {
 349                         for(int x = 0, xx = 0; x < 32; x++, xx += 8) {
 350                                 if(mp1710_enb & 1) {
 351                                         uint8_t color = color_table[taddr];
 352                                         if(screen_reversed) {
 353                                                 color = (color >> 4) | (color << 4);
 354                                         }
 355                                         fore = palette_pc[(color     ) & 7];
 356                                         back = palette_pc[(color >> 4) & 7];
 357                                 }
 358                                 for(int l = 0, ll = 0; l < 8; l++, ll += 32) {
 359                                         scrntype_t* dest = emu->get_screen_buffer(yy + l) + xx;
 360                                         uint8_t pat = ram[gaddr + ll];
 361                                         dest[0] = (pat & 0x80) ? fore : back;
 362                                         dest[1] = (pat & 0x40) ? fore : back;
 363                                         dest[2] = (pat & 0x20) ? fore : back;
 364                                         dest[3] = (pat & 0x10) ? fore : back;
 365                                         dest[4] = (pat & 0x08) ? fore : back;
 366                                         dest[5] = (pat & 0x04) ? fore : back;
 367                                         dest[6] = (pat & 0x02) ? fore : back;
 368                                         dest[7] = (pat & 0x01) ? fore : back;
 369                                 }
 370                                 taddr++;
 371                                 gaddr++;
 372                         }
 373                         gaddr += 32 * 7;
 374                 }
 375         }
 376 //      emu->screen_skip_line(false);
 377 }
 378
 379 #define STATE_VERSION   1
 380
 381 void MEMORY::save_state(FILEIO* state_fio)
 382 {
 383         state_fio->FputUint32(STATE_VERSION);
 384         state_fio->FputInt32(this_device_id);
 385
 386         state_fio->Fwrite(ram, sizeof(ram), 1);
 387         state_fio->FputUint8(memory_bank);
 388         state_fio->Fwrite(color_table, sizeof(color_table), 1);
 389         state_fio->FputUint8(char_color);
 390         state_fio->FputUint8(back_color);
 391         state_fio->FputUint8(mp1710_enb);
 392         state_fio->FputUint8(screen_mode);
 393         state_fio->FputBool(screen_reversed);
 394         state_fio->FputBool(drec_in);
 395         state_fio->FputUint8(key_column);
 396         state_fio->FputUint8(key_data);
 397         state_fio->FputBool(nmi_enb);
 398         state_fio->FputBool(break_pressed);
 399         state_fio->FputUint8(sound_sample);
 400         state_fio->FputDouble(sound_accum);
 401         state_fio->FputUint32(sound_clock);
 402         state_fio->FputUint32(sound_mix_clock);
 403 }
 404
 405 bool MEMORY::load_state(FILEIO* state_fio)
 406 {
 407         if(state_fio->FgetUint32() != STATE_VERSION) {
 408                 return false;
 409         }
 410         if(state_fio->FgetInt32() != this_device_id) {
 411                 return false;
 412         }
 413         state_fio->Fread(ram, sizeof(ram), 1);
 414         memory_bank = state_fio->FgetUint8();
 415         state_fio->Fread(color_table, sizeof(color_table), 1);
 416         char_color = state_fio->FgetUint8();
 417         back_color = state_fio->FgetUint8();
 418         mp1710_enb = state_fio->FgetUint8();
 419         screen_mode = state_fio->FgetUint8();
 420         screen_reversed = state_fio->FgetBool();
 421         drec_in = state_fio->FgetBool();
 422         key_column = state_fio->FgetUint8();
 423         key_data = state_fio->FgetUint8();
 424         nmi_enb = state_fio->FgetBool();
 425         break_pressed = state_fio->FgetBool();
 426         sound_sample = state_fio->FgetUint8();
 427         sound_accum = state_fio->FgetDouble();
 428         sound_clock = state_fio->FgetUint32();
 429         sound_mix_clock = state_fio->FgetUint32();
 430
 431         // post process
 432         update_bank();
 433         return true;
 434 }
 435