trunk/src/mame/drivers/alinvade.c
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| 4 | 4 | |
| 5 | 5 | does it use any off-the shelf chips in addition to the 6502? |
| 6 | 6 | |
| 7 | | |
| 7 | TODO: |
| 8 | - 16 bytes are protected in the c*** range. I'm guessing they used a PROM to protect a |
| 9 | simple sub-routine because just after that the program has a left-over located at 0xe000-0xe00f (yup, NOPs + a RTS) |
| 10 | It's unknown at current stage what it really protects tho ... |
| 11 | |
| 8 | 12 | */ |
| 9 | 13 | |
| 10 | 14 | #include "emu.h" |
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| 20 | 24 | { } |
| 21 | 25 | |
| 22 | 26 | UINT8 irqmask; |
| 27 | UINT8 irqff; |
| 28 | DECLARE_READ8_MEMBER(irqmask_r); |
| 23 | 29 | DECLARE_WRITE8_MEMBER(irqmask_w); |
| 24 | 30 | INTERRUPT_GEN_MEMBER(vblank_irq); |
| 25 | 31 | required_device<cpu_device> m_maincpu; |
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| 31 | 37 | UINT32 screen_update_alinvade(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect); |
| 32 | 38 | }; |
| 33 | 39 | |
| 40 | READ8_MEMBER(alinvade_state::irqmask_r) |
| 41 | { |
| 42 | return 0; // TODO: might be anything |
| 43 | } |
| 44 | |
| 45 | |
| 34 | 46 | WRITE8_MEMBER(alinvade_state::irqmask_w) |
| 35 | 47 | { |
| 36 | | irqmask = data; |
| 48 | if((!(irqff & 1)) && (data & 1)) // f/f, active high? If the above actually returns 0xff this could be active low ... |
| 49 | irqmask^= 1; |
| 50 | |
| 51 | irqff = data; |
| 37 | 52 | } |
| 38 | 53 | |
| 39 | 54 | static ADDRESS_MAP_START( alinvade_map, AS_PROGRAM, 8, alinvade_state ) |
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| 49 | 64 | AM_RANGE(0x8003, 0x8003) AM_READ_PORT("IN3") |
| 50 | 65 | AM_RANGE(0x8004, 0x8004) AM_READ_PORT("IN4") |
| 51 | 66 | AM_RANGE(0xa000, 0xa000) AM_WRITENOP //?? |
| 52 | | AM_RANGE(0xc400, 0xc7ff) AM_ROM |
| 53 | | AM_RANGE(0xc800, 0xcbff) AM_ROM |
| 67 | AM_RANGE(0xc000, 0xc00f) AM_MIRROR(0xff0) AM_ROM AM_REGION("proms",0) |
| 54 | 68 | AM_RANGE(0xe000, 0xe3ff) AM_ROM |
| 55 | | AM_RANGE(0xe400, 0xe400) AM_WRITE(irqmask_w) //?? |
| 56 | | AM_RANGE(0xe800, 0xe800) AM_READNOP AM_WRITENOP //?? |
| 69 | AM_RANGE(0xe400, 0xe400) AM_WRITENOP //?? |
| 70 | AM_RANGE(0xe800, 0xe800) AM_READWRITE(irqmask_r,irqmask_w) //?? |
| 57 | 71 | AM_RANGE(0xec00, 0xffff) AM_ROM |
| 58 | 72 | ADDRESS_MAP_END |
| 59 | 73 | |
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| 102 | 116 | |
| 103 | 117 | void alinvade_state::machine_reset() |
| 104 | 118 | { |
| 119 | irqmask = 1; |
| 105 | 120 | } |
| 106 | 121 | |
| 107 | 122 | UINT32 alinvade_state::screen_update_alinvade(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect) |
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| 136 | 151 | m_maincpu->set_input_line(0,HOLD_LINE); |
| 137 | 152 | } |
| 138 | 153 | |
| 139 | | |
| 140 | | |
| 141 | | |
| 142 | 154 | static MACHINE_CONFIG_START( alinvade, alinvade_state ) |
| 143 | 155 | |
| 144 | 156 | /* basic machine hardware */ |
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| 154 | 166 | MCFG_SCREEN_VISIBLE_AREA(0, 128-1, 0, 128-1) |
| 155 | 167 | MCFG_SCREEN_UPDATE_DRIVER(alinvade_state, screen_update_alinvade) |
| 156 | 168 | |
| 169 | // TODO: MCFG_DEFAULT_LAYOUT for square pixels |
| 170 | |
| 157 | 171 | /* sound hardware */ |
| 158 | 172 | MCFG_SPEAKER_STANDARD_MONO("mono") |
| 159 | 173 | MACHINE_CONFIG_END |
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| 162 | 176 | |
| 163 | 177 | ROM_START( alinvade ) |
| 164 | 178 | ROM_REGION( 0x10000, "maincpu", 0 ) // todo, check mapping |
| 165 | | |
| 166 | | ROM_FILL( 0xc400, 0x800, 0x60 ) // rts for whole area, interrupt code jumps to various addresses here |
| 167 | | |
| 168 | 179 | ROM_LOAD( "alien28.708", 0xe000, 0x0400, CRC(de376295) SHA1(e8eddbb1be1f8661c6b5b39c0d78a65bded65db2) ) |
| 169 | 180 | ROM_LOAD( "alien29.708", 0xec00, 0x0400, CRC(20212977) SHA1(9d24a6b403d968267079fa6241545bd5a01afebb) ) |
| 170 | 181 | ROM_LOAD( "alien30.708", 0xf000, 0x0400, CRC(734b691c) SHA1(9e562159061eecf4b1dee4ea0ee4752c901a54aa) ) |
| 171 | 182 | ROM_LOAD( "alien31.708", 0xf400, 0x0400, CRC(5a70535c) SHA1(2827e7d4bffca78bd035da04481e1e972ee2da39) ) |
| 172 | 183 | ROM_LOAD( "alien32.708", 0xf800, 0x0400, CRC(332dd234) SHA1(9974668344a2a351868a9e7757d1c3a497dc5621) ) |
| 173 | 184 | ROM_LOAD( "alien33.708", 0xfc00, 0x0400, CRC(e0d57fc7) SHA1(7b8ddcb4a86811592d2d0bbc61b2f19e5caa9ccc) ) |
| 185 | |
| 186 | ROM_REGION( 0x20, "proms", 0 ) |
| 187 | ROM_LOAD( "prom", 0, 0x20, NO_DUMP ) |
| 188 | ROM_FILL( 0x00, 0x0f, 0xea ) |
| 189 | ROM_FILL( 0x0f, 0x01, 0x60 ) // rts for whole area, interrupt code jumps to various addresses here, check note on top. |
| 174 | 190 | ROM_END |
| 175 | 191 | |
| 176 | 192 | |
| 177 | | GAME( 198?, alinvade, 0, alinvade, alinvade, driver_device, 0, ROT90, "Forbes?", "Alien Invaders", GAME_NOT_WORKING ) |
| 193 | GAME( 198?, alinvade, 0, alinvade, alinvade, driver_device, 0, ROT90, "Forbes?", "Alien Invaders", GAME_UNEMULATED_PROTECTION ) |