diff options
Diffstat (limited to 'src/mame/drivers/zaccaria.c')
-rw-r--r-- | src/mame/drivers/zaccaria.c | 20 |
1 files changed, 10 insertions, 10 deletions
diff --git a/src/mame/drivers/zaccaria.c b/src/mame/drivers/zaccaria.c index 065b545367d..efdc005878d 100644 --- a/src/mame/drivers/zaccaria.c +++ b/src/mame/drivers/zaccaria.c @@ -300,13 +300,13 @@ ADDRESS_MAP_END 0 1 1 x x x x x x x x x x x x x Open bus 1 0 % % * * * * * * * * * * * * R /CS4A: Enable Rom 13 1 1 % % * * * * * * * * * * * * R /CS5A: Enable Rom 9 - note that the % bits go to pins 2 (6802 A12) and 26 (6802 A13) of the roms - monymony and jackrabt both use 2764 roms, which use pin 2 as A12 and pin 26 as N/C don't care - hence for actual chips used, the mem map is: + note that the % bits go to pins 2 (6802 A12) and 26 (6802 A13) of the roms + monymony and jackrabt both use 2764 roms, which use pin 2 as A12 and pin 26 as N/C don't care + hence for actual chips used, the mem map is: 1 0 x * * * * * * * * * * * * * R /CS4A: Enable Rom 13 1 1 x * * * * * * * * * * * * * R /CS5A: Enable Rom 9 - - 6821 PIA: CA1 comes from the master sound cpu's latch bit 7 (which is also connected to the AY chip at 4G's IOB1); CB1 comes from a periodic counter clocked by the 6802's clock, divided by 4096. CA2 and CB2 are disconnected. PA0-7 connect to the data busses of the AY-3-8910 chips; PB0 and PB1 connect to the BC1 and BDIR pins of the AY chip at 4G; PB2 and PB3 connect to the BC1 and BDIR pins of the AY chip at 4H. + + 6821 PIA: CA1 comes from the master sound cpu's latch bit 7 (which is also connected to the AY chip at 4G's IOB1); CB1 comes from a periodic counter clocked by the 6802's clock, divided by 4096. CA2 and CB2 are disconnected. PA0-7 connect to the data busses of the AY-3-8910 chips; PB0 and PB1 connect to the BC1 and BDIR pins of the AY chip at 4G; PB2 and PB3 connect to the BC1 and BDIR pins of the AY chip at 4H. */ static ADDRESS_MAP_START( sound_map_1, ADDRESS_SPACE_PROGRAM, 8 ) AM_RANGE(0x0000, 0x007f) AM_RAM @@ -327,13 +327,13 @@ ADDRESS_MAP_END x x 0 1 1 1 x x x x x x x x x x Open bus % % 1 0 * * * * * * * * * * * * R /CS1A: Enable Rom 8 % % 1 1 * * * * * * * * * * * * R /CS0A: Enable Rom 7 - note that the % bits go to pins 2 (6802 A14) and 26 (6802 A15) of the roms - monymony and jackrabt both use 2764 roms, which use pin 2 as A12 and pin 26 as N/C don't care - hence for actual chips used, the mem map is: + note that the % bits go to pins 2 (6802 A14) and 26 (6802 A15) of the roms + monymony and jackrabt both use 2764 roms, which use pin 2 as A12 and pin 26 as N/C don't care + hence for actual chips used, the mem map is: x * 1 0 * * * * * * * * * * * * R /CS1A: Enable Rom 8 x * 1 1 * * * * * * * * * * * * R /CS0A: Enable Rom 7 - - 6821 PIA: PA0-7, CA2 and CB1 connect to the TMS5200; CA1 and CB2 are disconnected, though the test mode assumes there's something connected to CB2 (possibly another LED like the one connected to PB4); PB3 connects to 'ACS' which goes to the z80. + + 6821 PIA: PA0-7, CA2 and CB1 connect to the TMS5200; CA1 and CB2 are disconnected, though the test mode assumes there's something connected to CB2 (possibly another LED like the one connected to PB4); PB3 connects to 'ACS' which goes to the z80. */ static ADDRESS_MAP_START( sound_map_2, ADDRESS_SPACE_PROGRAM, 8 ) AM_RANGE(0x0000, 0x007f) AM_RAM /* 6802 internal ram */ |