The chip in question is a 28PIN DIP 600 mil :
Technically speaking it acts as communication interface between the main and sub CPUs.It can be found on many Taito boards, this should be a complete list :
- Asuka & Asuka
- Cameltry
- Champion Wrestler
- Daisenpu
- Darius
- Exzisus
- Fighting hawk
- Gokidetor
- Hit The Ice
- Master of Weapons
- Midnight Landing
- Operation Wolf
- Rainbow Islands
- Rastan
- Taito Bingo Wave
- Tetris
- Top Speed
- Violence Fight
- Volfied
As said, 'furrtek' made a fanstatic job and took care of almost everything, decapping the IC (kindly donated by 'Ace`' from UKVAC forums, thanks again to him) and tracing the schematics from the silicon die translating them into Verilog code.I simply made the final and easy part designing a proper board based on an Altera (or Atmel) CPLD in TQFP100 package :
After some work needed to optmize the Verilog code on boards with different clock of Z80 CPU (I sent 'furrtek' a Cadash and Master of Weapon PCBs for this purpose) I successfully tested the replacement on all my arcade boards that carry this custom IC, it works flawlessly:
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