From c9cb321d4c94a2bb35e02d335970e6e14ae5c6f6 Mon Sep 17 00:00:00 2001 From: Lord-Nightmare Date: Tue, 27 Dec 2016 04:32:20 -0500 Subject: [PATCH] arkanoid.cpp: update comments about mcu hookup and schematics (n/w) --- src/mame/drivers/arkanoid.cpp | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/src/mame/drivers/arkanoid.cpp b/src/mame/drivers/arkanoid.cpp index ad20ea5a7d1..7612ece6051 100644 --- a/src/mame/drivers/arkanoid.cpp +++ b/src/mame/drivers/arkanoid.cpp @@ -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. */