/*************************************************************************** Atari "Round" hardware driver by Aaron Giles Games supported: * Off the Wall (1991) [2 sets] Known bugs: * none at this time **************************************************************************** Memory map (TBA) ***************************************************************************/ #include "emu.h" #include "cpu/m68000/m68000.h" #include "audio/atarijsa.h" #include "video/atarimo.h" #include "includes/offtwall.h" /************************************* * * Interrupt handling * *************************************/ static void update_interrupts(running_machine &machine) { offtwall_state *state = machine.driver_data(); cputag_set_input_line(machine, "maincpu", 4, state->m_scanline_int_state ? ASSERT_LINE : CLEAR_LINE); cputag_set_input_line(machine, "maincpu", 6, state->m_sound_int_state ? ASSERT_LINE : CLEAR_LINE); } /************************************* * * Initialization * *************************************/ static MACHINE_START( offtwall ) { atarigen_init(machine); } static MACHINE_RESET( offtwall ) { offtwall_state *state = machine.driver_data(); atarigen_eeprom_reset(state); atarigen_interrupt_reset(state, update_interrupts); atarivc_reset(*machine.primary_screen, state->m_atarivc_eof_data, 1); atarijsa_reset(); } /************************************* * * Video controller access * *************************************/ static READ16_HANDLER( offtwall_atarivc_r ) { return atarivc_r(*space->machine().primary_screen, offset); } static WRITE16_HANDLER( offtwall_atarivc_w ) { atarivc_w(*space->machine().primary_screen, offset, data, mem_mask); } /************************************* * * I/O handling * *************************************/ static READ16_HANDLER( special_port3_r ) { offtwall_state *state = space->machine().driver_data(); int result = input_port_read(space->machine(), "260010"); if (state->m_cpu_to_sound_ready) result ^= 0x0020; return result; } static WRITE16_HANDLER( io_latch_w ) { /* lower byte */ if (ACCESSING_BITS_0_7) { /* bit 4 resets the sound CPU */ cputag_set_input_line(space->machine(), "jsa", INPUT_LINE_RESET, (data & 0x10) ? CLEAR_LINE : ASSERT_LINE); if (!(data & 0x10)) atarijsa_reset(); } logerror("sound control = %04X\n", data); } /************************************* * * SLOOP workarounds * *************************************/ /*------------------------------------------------------------------------- Bankswitching Like the slapstic, the SoS bankswitches memory using A13 and A14. Unlike the slapstic, the exact addresses to trigger the bankswitch are unknown. Fortunately, Off the Wall uses a common routine for the important bankswitching. The playfield data is stored in the banked area of ROM, and by comparing the playfields to a real system, a mechanism to bankswitch at the appropriate time was discovered. Fortunately, it's really basic. OtW looks up the address to read playfield data from a table which is 58 words long. Word 0 assumes the bank is 0, word 1 assumes the bank is 1, etc. So we just trigger off of the table read and cause the bank to switch then. In addition, there is code which checksums longs from $40000 down to $3e000. The code wants that checksum to be $aaaa5555, but there is no obvious way for this to happen. To work around this, we watch for the final read from $3e000 and tweak the value such that the checksum will come out the $aaaa5555 magically. -------------------------------------------------------------------------*/ static READ16_HANDLER( bankswitch_r ) { offtwall_state *state = space->machine().driver_data(); /* this is the table lookup; the bank is determined by the address that was requested */ state->m_bank_offset = (offset & 3) * 0x1000; logerror("Bankswitch index %d -> %04X\n", offset, state->m_bank_offset); return state->m_bankswitch_base[offset]; } static READ16_HANDLER( bankrom_r ) { offtwall_state *state = space->machine().driver_data(); /* this is the banked ROM read */ logerror("%06X: %04X\n", cpu_get_previouspc(&space->device()), offset); /* if the values are $3e000 or $3e002 are being read by code just below the ROM bank area, we need to return the correct value to give the proper checksum */ if ((offset == 0x3000 || offset == 0x3001) && cpu_get_previouspc(&space->device()) > 0x37000) { UINT32 checksum = (space->read_word(0x3fd210) << 16) | space->read_word(0x3fd212); UINT32 us = 0xaaaa5555 - checksum; if (offset == 0x3001) return us & 0xffff; else return us >> 16; } return state->m_bankrom_base[(state->m_bank_offset + offset) & 0x3fff]; } /*------------------------------------------------------------------------- Sprite Cache Somewhere in the code, if all the hardware tests are met properly, some additional dummy sprites are added to the sprite cache before they are copied to sprite RAM. The sprite RAM copy routine computes the total width of all sprites as they are copied and if the total width is less than or equal to 38, it adds a "HARDWARE ERROR" sprite to the end. Here we detect the read of the sprite count from within the copy routine, and add some dummy sprites to the cache ourself if there isn't enough total width. -------------------------------------------------------------------------*/ static READ16_HANDLER( spritecache_count_r ) { offtwall_state *state = space->machine().driver_data(); int prevpc = cpu_get_previouspc(&space->device()); /* if this read is coming from $99f8 or $9992, it's in the sprite copy loop */ if (prevpc == 0x99f8 || prevpc == 0x9992) { UINT16 *data = &state->m_spritecache_count[-0x100]; int oldword = state->m_spritecache_count[0]; int count = oldword >> 8; int i, width = 0; /* compute the current total width */ for (i = 0; i < count; i++) width += 1 + ((data[i * 4 + 1] >> 4) & 7); /* if we're less than 39, keep adding dummy sprites until we hit it */ if (width <= 38) { while (width <= 38) { data[count * 4 + 0] = (42 * 8) << 7; data[count * 4 + 1] = ((30 * 8) << 7) | (7 << 4); data[count * 4 + 2] = 0; width += 8; count++; } /* update the final count in memory */ state->m_spritecache_count[0] = (count << 8) | (oldword & 0xff); } } /* and then read the data */ return state->m_spritecache_count[offset]; } /*------------------------------------------------------------------------- Unknown Verify In several places, the value 1 is stored to the byte at $3fdf1e. A fairly complex subroutine is called, and then $3fdf1e is checked to see if it was set to zero. If it was, "HARDWARE ERROR" is displayed. To avoid this, we just return 1 when this value is read within the range of PCs where it is tested. -------------------------------------------------------------------------*/ static READ16_HANDLER( unknown_verify_r ) { offtwall_state *state = space->machine().driver_data(); int prevpc = cpu_get_previouspc(&space->device()); if (prevpc < 0x5c5e || prevpc > 0xc432) return state->m_unknown_verify_base[offset]; else return state->m_unknown_verify_base[offset] | 0x100; } /************************************* * * Main CPU memory handlers * *************************************/ static ADDRESS_MAP_START( main_map, AS_PROGRAM, 16 ) AM_RANGE(0x000000, 0x037fff) AM_ROM AM_RANGE(0x038000, 0x03ffff) AM_READ(bankrom_r) AM_REGION("maincpu", 0x38000) AM_BASE_MEMBER(offtwall_state, m_bankrom_base) AM_RANGE(0x120000, 0x120fff) AM_READWRITE(atarigen_eeprom_r, atarigen_eeprom_w) AM_SHARE("eeprom") AM_RANGE(0x260000, 0x260001) AM_READ_PORT("260000") AM_RANGE(0x260002, 0x260003) AM_READ_PORT("260002") AM_RANGE(0x260010, 0x260011) AM_READ(special_port3_r) AM_RANGE(0x260012, 0x260013) AM_READ_PORT("260012") AM_RANGE(0x260020, 0x260021) AM_READ_PORT("260020") AM_RANGE(0x260022, 0x260023) AM_READ_PORT("260022") AM_RANGE(0x260024, 0x260025) AM_READ_PORT("260024") AM_RANGE(0x260030, 0x260031) AM_READ(atarigen_sound_r) AM_RANGE(0x260040, 0x260041) AM_WRITE(atarigen_sound_w) AM_RANGE(0x260050, 0x260051) AM_WRITE(io_latch_w) AM_RANGE(0x260060, 0x260061) AM_WRITE(atarigen_eeprom_enable_w) AM_RANGE(0x2a0000, 0x2a0001) AM_WRITE(watchdog_reset16_w) AM_RANGE(0x3e0000, 0x3e0fff) AM_RAM_WRITE(atarigen_666_paletteram_w) AM_BASE_GENERIC(paletteram) AM_RANGE(0x3effc0, 0x3effff) AM_READWRITE(offtwall_atarivc_r, offtwall_atarivc_w) AM_BASE_MEMBER(offtwall_state, m_atarivc_data) AM_RANGE(0x3f4000, 0x3f5eff) AM_RAM_WRITE(atarigen_playfield_latched_msb_w) AM_BASE_MEMBER(offtwall_state, m_playfield) AM_RANGE(0x3f5f00, 0x3f5f7f) AM_RAM AM_BASE_MEMBER(offtwall_state, m_atarivc_eof_data) AM_RANGE(0x3f5f80, 0x3f5fff) AM_READWRITE(atarimo_0_slipram_r, atarimo_0_slipram_w) AM_RANGE(0x3f6000, 0x3f7fff) AM_RAM_WRITE(atarigen_playfield_upper_w) AM_BASE_MEMBER(offtwall_state, m_playfield_upper) AM_RANGE(0x3f8000, 0x3fcfff) AM_RAM AM_RANGE(0x3fd000, 0x3fd7ff) AM_READWRITE(atarimo_0_spriteram_r, atarimo_0_spriteram_w) AM_RANGE(0x3fd800, 0x3fffff) AM_RAM ADDRESS_MAP_END /************************************* * * Port definitions * *************************************/ static INPUT_PORTS_START( offtwall ) PORT_START("260000") PORT_BIT( 0x0001, IP_ACTIVE_LOW, IPT_BUTTON4 ) PORT_PLAYER(2) PORT_BIT( 0x0002, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(2) PORT_BIT( 0x0004, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(2) PORT_BIT( 0x0008, IP_ACTIVE_LOW, IPT_BUTTON3 ) PORT_PLAYER(2) PORT_BIT( 0x0010, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_PLAYER(2) PORT_BIT( 0x0020, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_PLAYER(2) PORT_BIT( 0x0040, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_PLAYER(2) PORT_BIT( 0x0080, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_PLAYER(2) PORT_BIT( 0x0100, IP_ACTIVE_LOW, IPT_BUTTON4 ) PORT_PLAYER(1) PORT_BIT( 0x0200, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(1) PORT_BIT( 0x0400, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(1) PORT_BIT( 0x0800, IP_ACTIVE_LOW, IPT_BUTTON3 ) PORT_PLAYER(1) PORT_BIT( 0x1000, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_PLAYER(1) PORT_BIT( 0x2000, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_PLAYER(1) PORT_BIT( 0x4000, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_PLAYER(1) PORT_BIT( 0x8000, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_PLAYER(1) PORT_START("260002") PORT_BIT( 0x00ff, IP_ACTIVE_LOW, IPT_UNUSED ) PORT_BIT( 0x0100, IP_ACTIVE_LOW, IPT_BUTTON4 ) PORT_PLAYER(3) PORT_BIT( 0x0200, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(3) PORT_BIT( 0x0400, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(3) PORT_BIT( 0x0800, IP_ACTIVE_LOW, IPT_BUTTON3 ) PORT_PLAYER(3) PORT_BIT( 0x1000, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_PLAYER(3) PORT_BIT( 0x2000, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_PLAYER(3) PORT_BIT( 0x4000, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_PLAYER(3) PORT_BIT( 0x8000, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_PLAYER(3) PORT_START("260010") PORT_BIT( 0x0001, IP_ACTIVE_LOW, IPT_UNUSED ) PORT_DIPNAME( 0x0002, 0x0000, DEF_STR( Controls ) ) PORT_DIPSETTING( 0x0000, "Whirly-gigs" ) /* this is official Atari terminology! */ PORT_DIPSETTING( 0x0002, "Joysticks" ) PORT_BIT( 0x0004, IP_ACTIVE_LOW, IPT_UNUSED ) /* tested at a454 */ PORT_BIT( 0x0008, IP_ACTIVE_LOW, IPT_UNUSED ) /* tested at a466 */ PORT_BIT( 0x0010, IP_ACTIVE_LOW, IPT_UNUSED ) PORT_BIT( 0x0020, IP_ACTIVE_LOW, IPT_UNUSED ) /* tested before writing to 260040 */ PORT_SERVICE( 0x0040, IP_ACTIVE_LOW ) PORT_BIT( 0x0080, IP_ACTIVE_LOW, IPT_VBLANK ) PORT_BIT( 0xff00, IP_ACTIVE_LOW, IPT_UNUSED ) PORT_START("260012") PORT_BIT( 0xffff, IP_ACTIVE_LOW, IPT_UNUSED ) PORT_START("260020") PORT_BIT( 0xff, 0, IPT_DIAL_V ) PORT_SENSITIVITY(50) PORT_KEYDELTA(10) PORT_PLAYER(1) PORT_BIT( 0xff00, IP_ACTIVE_LOW, IPT_UNUSED ) PORT_START("260022") PORT_BIT( 0xff, 0, IPT_DIAL ) PORT_SENSITIVITY(50) PORT_KEYDELTA(10) PORT_PLAYER(2) PORT_BIT( 0xff00, IP_ACTIVE_LOW, IPT_UNUSED ) PORT_START("260024") PORT_BIT( 0xff, 0, IPT_DIAL_V ) PORT_SENSITIVITY(50) PORT_KEYDELTA(10) PORT_REVERSE PORT_PLAYER(3) PORT_BIT( 0xff00, IP_ACTIVE_LOW, IPT_UNUSED ) PORT_INCLUDE( atarijsa_iii ) /* audio board port */ INPUT_PORTS_END /************************************* * * Graphics definitions * *************************************/ static const gfx_layout pfmolayout = { 8,8, RGN_FRAC(1,2), 4, { RGN_FRAC(1,2)+0, RGN_FRAC(1,2)+4, 0, 4 }, { 0, 1, 2, 3, 8, 9, 10, 11 }, { 0*8, 2*8, 4*8, 6*8, 8*8, 10*8, 12*8, 14*8 }, 16*8 }; static GFXDECODE_START( offtwall ) GFXDECODE_ENTRY( "gfx1", 0, pfmolayout, 256, 32 ) /* sprites & playfield */ GFXDECODE_END /************************************* * * Machine driver * *************************************/ static MACHINE_CONFIG_START( offtwall, offtwall_state ) /* basic machine hardware */ MCFG_CPU_ADD("maincpu", M68000, ATARI_CLOCK_14MHz/2) MCFG_CPU_PROGRAM_MAP(main_map) MCFG_MACHINE_START(offtwall) MCFG_MACHINE_RESET(offtwall) MCFG_NVRAM_ADD_1FILL("eeprom") /* video hardware */ MCFG_VIDEO_ATTRIBUTES(VIDEO_UPDATE_BEFORE_VBLANK) MCFG_GFXDECODE(offtwall) MCFG_PALETTE_LENGTH(2048) MCFG_SCREEN_ADD("screen", RASTER) MCFG_SCREEN_FORMAT(BITMAP_FORMAT_INDEXED16) /* note: these parameters are from published specs, not derived */ /* the board uses a VAD chip to generate video signals */ MCFG_SCREEN_RAW_PARAMS(ATARI_CLOCK_14MHz/2, 456, 0, 336, 262, 0, 240) MCFG_SCREEN_UPDATE(offtwall) MCFG_VIDEO_START(offtwall) /* sound hardware */ MCFG_FRAGMENT_ADD(jsa_iii_mono_noadpcm) MACHINE_CONFIG_END /************************************* * * ROM definition(s) * *************************************/ ROM_START( offtwall ) ROM_REGION( 0x40000, "maincpu", 0 ) /* 4*64k for 68000 code */ ROM_LOAD16_BYTE( "otw2012.bin", 0x00000, 0x20000, CRC(d08d81eb) SHA1(5a72aa2e4fc6455b94aa59a7719d0ddc8bcc80f2) ) ROM_LOAD16_BYTE( "otw2013.bin", 0x00001, 0x20000, CRC(61c2553d) SHA1(343d39f9b75fd236e9769ec21ab65310f85e31ca) ) ROM_REGION( 0x14000, "jsa", 0 ) /* 64k for 6502 code */ ROM_LOAD( "otw1020.bin", 0x10000, 0x4000, CRC(488112a5) SHA1(55e84855daacfa303d1031de8c9adb992a846e21) ) ROM_CONTINUE( 0x04000, 0xc000 ) ROM_REGION( 0xc0000, "gfx1", ROMREGION_INVERT ) ROM_LOAD( "otw1014.bin", 0x000000, 0x20000, CRC(4d64507e) SHA1(cb2ac41aecd2702cd57c746a6f5986cd753bc29e) ) ROM_LOAD( "otw1016.bin", 0x020000, 0x20000, CRC(f5454f3a) SHA1(87d82bd227f7fcfd13b6f4ad88a573d1b96a4fc1) ) ROM_LOAD( "otw1018.bin", 0x040000, 0x20000, CRC(17864231) SHA1(22f93fcb5d413281157ab8545647f3713f98c135) ) ROM_LOAD( "otw1015.bin", 0x060000, 0x20000, CRC(271f7856) SHA1(928bc5e7dc589ceb5f55e536b5a05c3866116a24) ) ROM_LOAD( "otw1017.bin", 0x080000, 0x20000, CRC(7f7f8012) SHA1(1123ea3c6cd2c73617a87d6a5bbb26fca8941af3) ) ROM_LOAD( "otw1019.bin", 0x0a0000, 0x20000, CRC(9efe511b) SHA1(db1f1d8792bf497bc9ad652b0b7d78c3abf0e817) ) ROM_REGION( 0x1000, "eeprom", 0 ) ROM_LOAD( "offtwall-eeprom.bin", 0x0000, 0x1000, CRC(73dc2139) SHA1(28ee9be4b5a65708a4f3e7d88e98af15cd9badca) ) ROM_END ROM_START( offtwallc ) ROM_REGION( 0x40000, "maincpu", 0 ) /* 4*64k for 68000 code */ ROM_LOAD16_BYTE( "090-2612.rom", 0x00000, 0x20000, CRC(fc891a3f) SHA1(027815a20fbc6c0c9242768581b97362b39941c2) ) ROM_LOAD16_BYTE( "090-2613.rom", 0x00001, 0x20000, CRC(805d79d4) SHA1(943ec9f408ba875bdf1794ce7d24803043480401) ) ROM_REGION( 0x14000, "jsa", 0 ) /* 64k for 6502 code */ ROM_LOAD( "otw1020.bin", 0x10000, 0x4000, CRC(488112a5) SHA1(55e84855daacfa303d1031de8c9adb992a846e21) ) ROM_CONTINUE( 0x04000, 0xc000 ) ROM_REGION( 0xc0000, "gfx1", ROMREGION_INVERT ) ROM_LOAD( "090-1614.rom", 0x000000, 0x20000, CRC(307ed447) SHA1(acee15e58cd8def8e52a7586aa14240e1f8be319) ) ROM_LOAD( "090-1616.rom", 0x020000, 0x20000, CRC(a5bd3d9b) SHA1(756d96eac2398dc68679b7641acbf0e79204eebb) ) ROM_LOAD( "090-1618.rom", 0x040000, 0x20000, CRC(c7d9df5d) SHA1(d5e5fbb7faf42d865862b9ac60f94d20820b00f3) ) ROM_LOAD( "090-1615.rom", 0x060000, 0x20000, CRC(ac3642c7) SHA1(bb57e039c113c4ce5702983c8e01dbe286d7b58e) ) ROM_LOAD( "090-1617.rom", 0x080000, 0x20000, CRC(15208a89) SHA1(124484ab54959a1e6d9022a4f3ee4288a79c768b) ) ROM_LOAD( "090-1619.rom", 0x0a0000, 0x20000, CRC(8a5d79b3) SHA1(0a202d20e6c86989ce2223e10eadf9009dd6ca8e) ) ROM_REGION( 0x1000, "eeprom", 0 ) ROM_LOAD( "offtwall-eeprom.bin", 0x0000, 0x1000, CRC(73dc2139) SHA1(28ee9be4b5a65708a4f3e7d88e98af15cd9badca) ) ROM_END /************************************* * * Driver initialization * *************************************/ static DRIVER_INIT( offtwall ) { offtwall_state *state = machine.driver_data(); atarijsa_init(machine, "260010", 0x0040); /* install son-of-slapstic workarounds */ state->m_spritecache_count = machine.device("maincpu")->memory().space(AS_PROGRAM)->install_legacy_read_handler(0x3fde42, 0x3fde43, FUNC(spritecache_count_r)); state->m_bankswitch_base = machine.device("maincpu")->memory().space(AS_PROGRAM)->install_legacy_read_handler(0x037ec2, 0x037f39, FUNC(bankswitch_r)); state->m_unknown_verify_base = machine.device("maincpu")->memory().space(AS_PROGRAM)->install_legacy_read_handler(0x3fdf1e, 0x3fdf1f, FUNC(unknown_verify_r)); } static DRIVER_INIT( offtwalc ) { offtwall_state *state = machine.driver_data(); atarijsa_init(machine, "260010", 0x0040); /* install son-of-slapstic workarounds */ state->m_spritecache_count = machine.device("maincpu")->memory().space(AS_PROGRAM)->install_legacy_read_handler(0x3fde42, 0x3fde43, FUNC(spritecache_count_r)); state->m_bankswitch_base = machine.device("maincpu")->memory().space(AS_PROGRAM)->install_legacy_read_handler(0x037eca, 0x037f43, FUNC(bankswitch_r)); state->m_unknown_verify_base = machine.device("maincpu")->memory().space(AS_PROGRAM)->install_legacy_read_handler(0x3fdf24, 0x3fdf25, FUNC(unknown_verify_r)); } /************************************* * * Game driver(s) * *************************************/ GAME( 1991, offtwall, 0, offtwall, offtwall, offtwall, ROT0, "Atari Games", "Off the Wall (2/3-player upright)", 0 ) GAME( 1991, offtwallc,offtwall, offtwall, offtwall, offtwalc, ROT0, "Atari Games", "Off the Wall (2-player cocktail)", 0 )