trunk/src/mess/drivers/gameking.c
| r32750 | r32751 | |
|---|
| 2 | 2 | |
| 3 | 3 | // these are meant to have a 3-in-1 internal ROM, not dumped |
| 4 | 4 | |
| 5 | /* |
| 6 | The carridge dumps have something what looks like vectors/pointers to interesting pieces |
| 7 | of code at offsets like $004c, $0050, $0054, $0060, $0064, $0068, and $0070 (some carts). |
| 8 | |
| 9 | At offset $004c there is usually $00 $40, $00, $01; this seems to point to bank #1/offset $4000, |
| 10 | which should get banked in at address $4000. There is valid at offset $4000 in the cartridge |
| 11 | dumps. |
| 12 | |
| 13 | There seem to be some RAM that starts at $1000 in the memomry map. |
| 14 | |
| 15 | A routine at $0f80 seems to be called a lot. It's probably some kind of entry into the |
| 16 | bios to perform several functions. The function to perform seems to be passed through |
| 17 | the A register with pointer to parameters stored at $0080-$0081 (multiple parameters/ |
| 18 | blocks?). |
| 19 | |
| 20 | The reset and irq vectors seem to be the same in most, if not all, cartridge dumps. It |
| 21 | is very likely that they point to code in the internal bios. |
| 22 | |
| 23 | */ |
| 24 | |
| 5 | 25 | #include "emu.h" |
| 6 | 26 | #include "cpu/m6502/m65c02.h" |
| 7 | 27 | #include "bus/generic/slot.h" |
| r32750 | r32751 | |
|---|
| 33 | 53 | required_device<palette_device> m_palette; |
| 34 | 54 | |
| 35 | 55 | memory_region *m_cart_rom; |
| 36 | | memory_bank *m_mainbank; |
| 56 | memory_bank *m_bank4000; |
| 57 | memory_bank *m_bank8000; |
| 58 | memory_bank *m_bankc000; |
| 37 | 59 | }; |
| 38 | 60 | |
| 39 | 61 | static ADDRESS_MAP_START( gameking_mem , AS_PROGRAM, 8, gameking_state ) |
| 40 | | AM_RANGE(0xc000, 0xffff) AM_ROMBANK("mainbank") |
| 62 | AM_RANGE(0x0000, 0x01ff) AM_RAM |
| 63 | |
| 64 | AM_RANGE(0x0f00, 0x0fff) AM_ROM |
| 65 | |
| 66 | AM_RANGE(0x1000, 0x1fff) AM_RAM // sthero writes to $19xx |
| 67 | |
| 68 | AM_RANGE(0x4000, 0x7fff) AM_ROMBANK("bank4000") |
| 69 | AM_RANGE(0x8000, 0xcfff) AM_ROMBANK("bank8000") |
| 70 | AM_RANGE(0xc000, 0xffff) AM_ROMBANK("bankc000") |
| 41 | 71 | ADDRESS_MAP_END |
| 42 | 72 | |
| 43 | 73 | |
| r32750 | r32751 | |
|---|
| 93 | 123 | |
| 94 | 124 | if (!m_cart_rom) printf("No Rom\n"); |
| 95 | 125 | |
| 96 | | m_mainbank = membank("mainbank"); |
| 97 | | m_mainbank->set_base(m_cart_rom->base()); |
| 126 | m_bank4000 = membank("bank4000"); |
| 127 | m_bank8000 = membank("bank8000"); |
| 128 | m_bankc000 = membank("bankc000"); |
| 129 | |
| 130 | // Minor hacking to get things going (should be removed when we have bios dump) |
| 131 | m_cart_rom->base()[0x3ffc] = 0x00; |
| 132 | m_cart_rom->base()[0x3ffd] = 0x40; |
| 133 | |
| 134 | // Some fake code to get bios functions called logged |
| 135 | memory_region *maincpu_rom = memregion("maincpu"); |
| 136 | maincpu_rom->base()[0x0f80] = 0x9d; // STA $0e00,X |
| 137 | maincpu_rom->base()[0x0f81] = 0x00; |
| 138 | maincpu_rom->base()[0x0f82] = 0x0e; |
| 139 | maincpu_rom->base()[0x0f83] = 0x60; // RTS |
| 140 | |
| 141 | m_bank8000->set_base(m_cart_rom->base()); |
| 142 | m_bankc000->set_base(m_cart_rom->base()); |
| 143 | m_bank4000->set_base(m_cart_rom->base() + 0x4000); |
| 98 | 144 | } |
| 99 | 145 | |
| 100 | 146 | void gameking_state::machine_reset() |
| r32750 | r32751 | |
|---|
| 133 | 179 | MACHINE_CONFIG_END |
| 134 | 180 | |
| 135 | 181 | ROM_START(gameking) |
| 182 | ROM_REGION(0x8000, "maincpu", ROMREGION_ERASE00) |
| 136 | 183 | ROM_END |
| 137 | 184 | |
| 138 | 185 | |