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arkanoid.cpp: update comments about mcu hookup and schematics (n/w)

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Lord-Nightmare 2016-12-27 04:32:20 -05:00
parent ab649546e5
commit c9cb321d4c
1 changed files with 2 additions and 1 deletions
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src/mame/drivers/arkanoid.cpp
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@ -911,6 +911,7 @@ static ADDRESS_MAP_START( mcu_map, AS_PROGRAM, 8, arkanoid_state )
ADDRESS_MAP_END
/* MCU Hookup based on 'Arkanoid_TAITO_(Japan 1986) PCB.rar' from Taro and others at http://zx-pk.ru forums
NOTE and TODO: these comments have not been significantly updated since the real taito arkanoid schematics were found. beware of mistakes!
ic5 = 74ls669
ic6 = 74ls669
ic9 = 74ls257
@ -961,7 +962,7 @@ Clock : from z80, somehow; also is /oe of ic27
Q : N/C
/Q : -> 68705 PC1 and z80, somehow
Note: despite having a signal on it (possibly vblank or one of the V counter bits), the TIMER/BOOT pin is seemingly never used by the MCU in input mode, so the signal is ignored.
Note: despite having a signal on it (/VBLK according to the schematics), the TIMER/BOOT pin is seemingly never used by the MCU in input mode, so the signal is ignored.
Note2: PA0 is connected to bit 0 of both the z80->68705 latch and the 68705->z80 latch. The board trace from http://zx-pk.ru is known to be incomplete, so its likely all of the PAx bits go both ways.
*/