src/mess/drivers/socrates.c
| r5330 | r5331 | |
|---|
| 137 | 137 | READ8_HANDLER( socrates_ram_bank_r ) |
| 138 | 138 | { |
| 139 | 139 | UINT8 data = 0xFF; |
| 140 | | data = socrates.ram_bank | 0xF0; |
| 140 | data = socrates.ram_bank |
| 141 | 141 | return data; |
| 142 | 142 | } |
| 143 | 143 | |
| 144 | 144 | WRITE8_HANDLER( socrates_ram_bank_w ) |
| 145 | 145 | { |
| 146 | | socrates.ram_bank = data; |
| 146 | socrates.ram_bank = data&0xF; |
| 147 | 147 | socrates_set_ram_bank( space->machine ); |
| 148 | 148 | } |
| 149 | 149 | |
| 150 | READ8_HANDLER( read_f3 ) // used for read-only i/o ports as mame/mess doesn't have a way to set the unmapped area to read as 0xF3 |
| 151 | { |
| 152 | return 0xF3; |
| 153 | } |
| 154 | |
| 155 | WRITE8_HANDLER( unknownlatch_30 ) // writes to i/o 0x3x do SOMETHING, probably reset a latch, but I don't know yet |
| 156 | { |
| 157 | //popmessage("write to i/o 0x30"); |
| 158 | } |
| 159 | |
| 160 | READ8_HANDLER( socrates_keyboard_50_r ) // keyboard code low |
| 161 | { |
| 162 | return 0x00; // write me! |
| 163 | } |
| 164 | |
| 165 | READ8_HANDLER( socrates_keyboard_51_r ) // keyboard code high |
| 166 | { |
| 167 | return 0x01; // write me! |
| 168 | } |
| 169 | |
| 170 | WRITE8_HANDLER( socrates_keyboard_reset ) // keyboard latch reset |
| 171 | { |
| 172 | //popmessage("kb latch reset!"); |
| 173 | } |
| 174 | |
| 175 | WRITE8_HANDLER( unknown_6x ) // writes to i/o 0x6x happens on startup once, with 0x01. no idea what it does. |
| 176 | { |
| 177 | //popmessage("write to i/o 0x60"); |
| 178 | } |
| 179 | |
| 150 | 180 | /* stuff below belongs in video/socrates.c */ |
| 151 | 181 | |
| 152 | 182 | WRITE8_HANDLER( socrates_scroll_w ) |
| r5330 | r5331 | |
|---|
| 174 | 204 | #define CHROMA_COL_2 0.125125, 0.27525, 0.230225, 0.384875, 0.125125, 0.27525, 0.230225, 0.384875, 0.125125, 0.27525, 0.230225, 0.384875, 0.125125, 0.27525, 0.230225, 0.384875, |
| 175 | 205 | #define CHROMA_COL_5 0.1235, 0.2695, 0.22625, 0.378, 0.1235, 0.2695, 0.22625, 0.378, 0.1235, 0.2695, 0.22625, 0.378, 0.1235, 0.2695, 0.22625, 0.378, |
| 176 | 206 | // gamma: this needs to be messed with... may differ on different systems... attach to slider somehow? |
| 177 | | #define GAMMA 2.0 |
| 207 | #define GAMMA 1.3 |
| 178 | 208 | |
| 179 | 209 | static rgb_t socrates_create_color(UINT8 color) |
| 180 | 210 | { |
| r5330 | r5331 | |
|---|
| 342 | 372 | ADDRESS_MAP_GLOBAL_MASK(0xff) |
| 343 | 373 | AM_RANGE(0x00, 0x00) AM_READWRITE(socrates_rom_bank_r, socrates_rom_bank_w) AM_MIRROR(0x7) /* rom bank select - RW - 8 bits */ |
| 344 | 374 | AM_RANGE(0x08, 0x08) AM_READWRITE(socrates_ram_bank_r, socrates_ram_bank_w) AM_MIRROR(0x7) /* ram banks select - RW - 4 low bits; Format: 0b****HHLL where LL controls whether window 0 points at ram area: 0b00: 0x0000-0x3fff; 0b01: 0x4000-0x7fff; 0b10: 0x8000-0xbfff; 0b11: 0xc000-0xffff. HH controls the same thing for window 1 */ |
| 345 | | AM_RANGE(0x10, 0x17) AM_WRITE(socrates_sound_w) AM_MIRROR (0x8) /* sound section: |
| 375 | AM_RANGE(0x10, 0x17) AM_READWRITE(read_f3, socrates_sound_w) AM_MIRROR (0x8) /* sound section: |
| 346 | 376 | 0x10 - W - frequency control for channel 1 (louder channel) - 01=high pitch, ff=low; time between 1->0/0->1 transitions = (XTAL_21_4772MHz/(512+256) / (freq_reg+1)) (note that this is double the actual frequency since each full low and high squarewave pulse is two transitions) |
| 347 | 377 | 0x11 - W - frequency control for channel 2 (softer channel) - 01=high pitch, ff=low; same equation as above |
| 348 | 378 | 0x12 - W - 0b****VVVV volume control for channel 1 |
| 349 | 379 | 0x13 - W - 0b****VVVV volume control for channel 2 |
| 350 | 380 | 0x14-0x17 - ?DAC? related? makes noise when written to... code implies 0x16 and 0x17 are mirrors of 0x14 and 0x15 respectively. |
| 351 | 381 | */ |
| 352 | | AM_RANGE(0x20, 0x21) AM_WRITE(socrates_scroll_w) AM_MIRROR (0xe) /* graphics section: |
| 382 | AM_RANGE(0x20, 0x21) AM_READWRITE(read_f3, socrates_scroll_w) AM_MIRROR (0xe) /* graphics section: |
| 353 | 383 | 0x20 - W - lsb offset of screen display |
| 354 | 384 | 0x21 - W - msb offset of screen display |
| 355 | 385 | resulting screen line is one of 512 total offsets on 128-byte boundaries in the whole 64k ram |
| 356 | 386 | */ |
| 357 | | AM_RANGE(0x30, 0x30) AM_NOP /* unknown, write only */ |
| 358 | | AM_RANGE(0x40, 0x40) AM_RAM AM_MIRROR(0xF)/* unknown, read and write low 4 bits plus bit 5, bit 7 seems to be fixed at 0, bit 6 and 4 are fixed at 1? is this some sort of control register for timers perhaps? gets a slew of data written to it a few times during startup, may be IR related? */ |
| 359 | | AM_RANGE(0x50, 0x50) AM_RAM AM_MIRROR(0xE) /* unknown, read and write (bits?) reads serially shift 1 bit somewhere? */ |
| 360 | | AM_RANGE(0x51, 0x51) AM_RAM AM_MIRROR(0xE) /* unknown, read and write (bits?) reads serially shift 1 bit somewhere? */ |
| 361 | | AM_RANGE(0x60, 0x60) AM_NOP AM_MIRROR(0xF) /* unknown, write only */ |
| 387 | AM_RANGE(0x30, 0x30) AM_READWRITE(read_f3, unknownlatch_30) AM_MIRROR (0xf) /* unknown, write only */ |
| 388 | //AM_RANGE(0x40, 0x40) AM_RAM AM_MIRROR(0xF)/* unknown, read and write low 4 bits plus bit 5, bit 7 seems to be fixed at 0, bit 6 and 4 are fixed at 1? is this some sort of control register for timers perhaps? gets a slew of data written to it a few times during startup, may be IR or timer related? */ |
| 389 | AM_RANGE(0x50, 0x50) AM_READWRITE(socrates_keyboard_50_r, socrates_keyboard_reset) AM_MIRROR(0xE) /* Keyboard keycode low, latched on keypress, can only be unlatched by writing 00 here */ |
| 390 | AM_RANGE(0x51, 0x51) AM_READ(socrates_keyboard_51_r) AM_MIRROR(0xE) /* Keyboard keycode high, latched as above */ |
| 391 | AM_RANGE(0x60, 0x60) AM_READWRITE(read_f3, unknown_6x) AM_MIRROR(0xF) /* unknown, write only */ |
| 392 | AM_RANGE(0x70, 0xFF) AM_READ(read_f3) // nothing mapped here afaik |
| 362 | 393 | ADDRESS_MAP_END |
| 363 | 394 | |
| 364 | 395 | |