/*
Space Bugger
Game-A-Tron, 1981
TS 20060821:
- there's really huge difference between both sets (code and data). weird
- wrong colros, it looks like tehre's direct color mapping - bits from attribute ram connected to r/g/b outputs without
use of color prom or color table
- interrupt is generated by 8156 - very old combination chip containing 256*8 RAM (used as stack area),
a timer and 8+8+6 ports. After game start all 8156 ports are set as inputs, timer is working in mode 3 - automatic reload.
TC register is set to 0x7f. Timer input frequency is unknown. Output should be close to 1440 Hz.
PCB Layout
----------
CPU
2.81
GAT
|------------------------------------------------------|
| 74LS393 |
| 74LS00 TIP41A CN1|
| |
|-| 74LS32 74LS00 74LS161 |
| |
| 74LS10 CN2|
| 74LS139 74LS240 |
| |-----------| |
| 74LS240 74LS244 | TMP8085 | 74LS04 |
| |-----------|6MHz |
| 74LS244 74LS373 74LS244 DSW(7) 74LS04 |
| |-----------| |
| uPB8216 uPB8216 | TMP8156 | |
| |-----------| |
| 2114 2114 74LS244 U32 |
| |
| 2114 2114 74LS32 U33 U20 |
|-| |
| 2114 2114 74LS138 U34 U21 |
| |
| 2114 2114 74LS138 U35 U22 |
|------------------------------------------------------|
Notes:
All IC's shown.
uPB8216 - NEC uPB8216 4 Bit Bi-directional Bus Driver
2114 - Hitachi HM572114P-4 1k x4 SRAM
TMP8156 - RIOT, 256 bytes Static RAM with I/O Ports and Timer
TMP8085 - 8085 CPU, clock 3MHz [6/2]
CN1/2 - 10 pin connectors
U20-U22 - Hitachi HM462716G 2k x8 EPROMs
U32-U35 /
Note, this PCB plugs into a motherboard containing connectors. There is
also a sound and graphics board that plugs into the motherboard as well.
However those PCBs are not available and are therefore not documented.
Set 2:
--------
Space Bugger
Game-A-Tron 1981
U20 U21 U22
U32 U33 U34 U35
6MHz
8085 8156
2114 2114 2114 2114
2114 2114 2114 2114
Main
-------
GFX
2114 2114 2114 2114
12.440MHz
Graphics PCB
-------
76489 76489
Sound PCB
-------
*/
#include "emu.h"
#include "cpu/i8085/i8085.h"
#include "sound/sn76496.h"
#include "includes/sbugger.h"
//arbitrary
#define NUM_INTS_FRAME 24
/* memory maps */
static ADDRESS_MAP_START( sbugger_map, AS_PROGRAM, 8 )
AM_RANGE(0x0000, 0x37ff) AM_ROM
AM_RANGE(0xc800, 0xcbff) AM_RAM_WRITE(sbugger_videoram_attr_w) AM_BASE_MEMBER(sbugger_state,m_videoram_attr)
AM_RANGE(0xcc00, 0xcfff) AM_RAM_WRITE(sbugger_videoram_w) AM_BASE_MEMBER(sbugger_state,m_videoram)
AM_RANGE(0xe000, 0xe0ff) AM_RAM /* sp is set to e0ff */
AM_RANGE(0xf400, 0xffff) AM_RAM
ADDRESS_MAP_END
static ADDRESS_MAP_START( sbugger_io_map, AS_IO, 8 )
AM_RANGE(0xe0, 0xe0) AM_WRITENOP // 8156 command/status reg (write c0 = command START = (start of timer)
AM_RANGE(0xe1, 0xe1) AM_READ_PORT("INPUTS") // 8156 PA
AM_RANGE(0xe2, 0xe2) AM_READ_PORT("DSW1") // 8156 PB
AM_RANGE(0xe3, 0xe3) AM_READ_PORT("DSW2") // 8156 PC = 6 bit ! //2 bits tested af f4c6
AM_RANGE(0xe4, 0xe4) AM_WRITENOP // 8156 timer reg1 (write 7f = CNT length)
AM_RANGE(0xe5, 0xe5) AM_WRITENOP // 8156 timer reg2 (write c0 = timer mode - automatic reload, i.e. single pulse every time TC is reached)
AM_RANGE(0xe8, 0xe8) AM_DEVWRITE("sn76489.1", sn76496_w)
AM_RANGE(0xe9, 0xe9) AM_DEVWRITE("sn76489.2", sn76496_w)
ADDRESS_MAP_END
/* gfx decode */
static const gfx_layout char16layout =
{
8,16,
RGN_FRAC(1,1),
1,
{ 0 },
{ 0, 1, 2, 3, 4, 5, 6, 7 },
{ 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8,
8*8, 9*8, 10*8, 11*8, 12*8, 13*8, 14*8, 15*8
},
16*8
};
static GFXDECODE_START( sbugger )
GFXDECODE_ENTRY( "gfx1", 0, char16layout, 0, 1 )
GFXDECODE_END
/* input ports */
static INPUT_PORTS_START( sbugger )
PORT_START("INPUTS")
PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_2WAY
PORT_DIPNAME( 0x02, 0x02, "PA 1" )
PORT_DIPSETTING( 0x02, DEF_STR( Off ) )
PORT_DIPSETTING( 0x00, DEF_STR( On ) )
PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_BUTTON1 )
PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_2WAY
PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON2 )
PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_START2 )
PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_START1 )
PORT_DIPNAME( 0x80, 0x80, "PA 7" )
PORT_DIPSETTING( 0x80, DEF_STR( Off ) )
PORT_DIPSETTING( 0x00, DEF_STR( On ) )
PORT_START("DSW1")
PORT_DIPNAME( 0x01, 0x01, "PB 0" )
PORT_DIPSETTING( 0x01, DEF_STR( Off ) )
PORT_DIPSETTING( 0x00, DEF_STR( On ) )
PORT_DIPNAME( 0x02, 0x02, "PB 1" )
PORT_DIPSETTING( 0x02, DEF_STR( Off ) )
PORT_DIPSETTING( 0x00, DEF_STR( On ) )
PORT_DIPNAME( 0x04, 0x04, "PB 2" )
PORT_DIPSETTING( 0x04, DEF_STR( Off ) )
PORT_DIPSETTING( 0x00, DEF_STR( On ) )
PORT_DIPNAME( 0x08, 0x08, "PB 3" )
PORT_DIPSETTING( 0x08, DEF_STR( Off ) )
PORT_DIPSETTING( 0x00, DEF_STR( On ) )
PORT_DIPNAME( 0x10, 0x10, "PB 4" )
PORT_DIPSETTING( 0x10, DEF_STR( Off ) )
PORT_DIPSETTING( 0x00, DEF_STR( On ) )
PORT_DIPNAME( 0x20, 0x20, "PB 5" )
PORT_DIPSETTING( 0x20, DEF_STR( Off ) )
PORT_DIPSETTING( 0x00, DEF_STR( On ) )
PORT_DIPNAME( 0x40, 0x40, "PB 6" )
PORT_DIPSETTING( 0x40, DEF_STR( Off ) )
PORT_DIPSETTING( 0x00, DEF_STR( On ) )
PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_COIN1 )
PORT_START("DSW2")
PORT_DIPNAME( 0x03, 0x01, DEF_STR( Difficulty ) ) //enemy speed
PORT_DIPSETTING( 0x00, DEF_STR( Easy ) )
PORT_DIPSETTING( 0x01, DEF_STR( Normal ) )
PORT_DIPSETTING( 0x02, DEF_STR( Hard ) )
PORT_DIPSETTING( 0x03, DEF_STR( Hardest ) )
PORT_DIPNAME( 0x04, 0x04, DEF_STR( Allow_Continue ) )
PORT_DIPSETTING( 0x00, DEF_STR( No ) )
PORT_DIPSETTING( 0x04, DEF_STR( Yes ) )
PORT_DIPNAME( 0x08, 0x08, DEF_STR( Unknown ) ) //bonus stage related (code at $f94 & $df8)
PORT_DIPSETTING( 0x08, DEF_STR( Off ) )
PORT_DIPSETTING( 0x00, DEF_STR( On ) )
PORT_DIPNAME( 0x10, 0x10, DEF_STR( Unknown ) )
PORT_DIPSETTING( 0x10, DEF_STR( Off ) )
PORT_DIPSETTING( 0x00, DEF_STR( On ) )
PORT_DIPNAME( 0x20, 0x20, DEF_STR( Unknown ) )
PORT_DIPSETTING( 0x20, DEF_STR( Off ) )
PORT_DIPSETTING( 0x00, DEF_STR( On ) )
PORT_BIT( 0xc0, IP_ACTIVE_HIGH, IPT_UNUSED )
INPUT_PORTS_END
/* machine driver */
static MACHINE_CONFIG_START( sbugger, sbugger_state )
MCFG_CPU_ADD("maincpu", I8085A, 6000000) /* 3.00 MHz??? */
MCFG_CPU_PROGRAM_MAP(sbugger_map)
MCFG_CPU_IO_MAP(sbugger_io_map)
MCFG_CPU_PERIODIC_INT(irq3_line_hold,NUM_INTS_FRAME*60)
MCFG_GFXDECODE(sbugger)
MCFG_SCREEN_ADD("screen", RASTER)
MCFG_SCREEN_REFRESH_RATE(60)
MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(0))
MCFG_SCREEN_FORMAT(BITMAP_FORMAT_INDEXED16)
MCFG_SCREEN_SIZE(64*8, 32*8)
MCFG_SCREEN_VISIBLE_AREA(0*8, 64*8-1, 0*8, 32*8-1)
MCFG_SCREEN_UPDATE(sbugger)
MCFG_PALETTE_LENGTH(512)
MCFG_PALETTE_INIT(sbugger)
MCFG_VIDEO_START(sbugger)
/* sound hardware */
MCFG_SPEAKER_STANDARD_MONO("mono")
MCFG_SOUND_ADD("sn76489.1", SN76489, 3000000)
MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.0)
MCFG_SOUND_ADD("sn76489.2", SN76489, 3000000)
MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.0)
MACHINE_CONFIG_END
/* rom loading */
ROM_START( sbugger )
ROM_REGION( 0x10000, "maincpu", 0 ) /* 8085 Code */
ROM_LOAD( "spbugger.u35", 0x0000, 0x0800, CRC(7c2000a1) SHA1(01a60745ea8e9a70de37d1a785fad1d17eafc812) ) // seems to map at 0
ROM_LOAD( "spbugger.u22", 0x0800, 0x0800, BAD_DUMP CRC(66e00c53) SHA1(49ca567a98978308306cdb8455c61c022668693b) ) // FIXED BITS (xxxx1111) it jumps here .... bad rom?
ROM_LOAD( "spbugger.u34", 0x1000, 0x0800, CRC(db357dde) SHA1(363392b971f48e9d99f4167aa17f0c885b0865ee) ) // seems to map at 1000
ROM_LOAD( "spbugger.u21", 0x1800, 0x0800, CRC(618a5b2a) SHA1(aa7a40b1944f09c396f675d7dd3a8c3c35bf01f1) ) // seems to map at 1800
ROM_LOAD( "spbugger.u20", 0x2000, 0x0800, CRC(8957563c) SHA1(b33a75fcf375d2a1a766105f87dd8e4d42db3d76) ) // seems to map at 2000
ROM_LOAD( "spbugger.u33", 0x2800, 0x0800, CRC(f6cb1399) SHA1(53cb67e29a238c5ac20c6be9423d850e004212c1) ) // seems to map at 2800
ROM_LOAD( "spbugger.u32", 0x3000, 0x0800, CRC(f49af2b3) SHA1(1519ee4786b78546767827d3a9508e7ddb646765) ) // seems to map at 3000
ROM_REGION( 0x1000, "gfx1", 0 ) /* GFX */
ROM_LOAD( "spbugger.gfx", 0x0000, 0x1000, CRC(d3f345b5) SHA1(a5082ffc3043352e9b731af95770bdd62fb928bf) )
ROM_END
ROM_START( sbuggera )
ROM_REGION( 0x10000, "maincpu", 0 ) /* 8085 Code */
ROM_LOAD( "bug_g10.u35", 0x0000, 0x0800, CRC(60a3044d) SHA1(5b2be551a84e4a7a35637208a19b3477629f20d9) )
ROM_LOAD( "bug_c10.u22", 0x0800, 0x0800, CRC(34a829f7) SHA1(135ec2739879c2e47f3c6d4a5196c865b5940a84) )
ROM_LOAD( "bug_f10.u34", 0x1000, 0x0800, CRC(e2f7a51c) SHA1(ee221f6697021d14838fd6c4aff41678ce62e4ba) )
ROM_LOAD( "bug_b10.u21", 0x1800, 0x0800, CRC(3c9a467a) SHA1(be64fddc294be38ff4f997e6666aaea15ed7d0e9) )
ROM_LOAD( "bug_a10.u20", 0x2000, 0x0800, CRC(f6f58aba) SHA1(95bf03b8876ff36f52d93f5f5f9b38021c8b7979) )
ROM_LOAD( "bug_e10.u33", 0x2800, 0x0800, CRC(fefd9c5e) SHA1(1b0bbf462231c32014d45ec21b105a669665d90d) )
ROM_LOAD( "bug_d10.u32", 0x3000, 0x0800, BAD_DUMP CRC(c807742f) SHA1(cb5c44ffd6dd184c6a0722003ff6674caf865bee) ) // missing in this set
ROM_REGION( 0x4000, "gfx1", 0 ) /* GFX */
ROM_LOAD( "spbugger.gfx", 0x0000, 0x1000, CRC(d3f345b5) SHA1(a5082ffc3043352e9b731af95770bdd62fb928bf) )
ROM_END
GAME( 1981, sbugger, 0, sbugger, sbugger, 0, ROT270, "Game-A-Tron", "Space Bugger (set 1)", GAME_NOT_WORKING )
GAME( 1981, sbuggera, sbugger, sbugger, sbugger, 0, ROT270, "Game-A-Tron", "Space Bugger (set 2)", GAME_IMPERFECT_COLORS )