Back to working on that Cyber Cycles twin for a while figuring out the bus error. Eventually narrowed the issue down to the video pcb. The driver, namcos22.cpp, states earlier video pcb revisions use an Altera chip as opposed to a Namco Custom 407 which is the case for that video pcb with the fault. Safe to say that the Altera chip is faulty and overheats easily to the point it will stop responding after leaving the system on for a while (~30min - 2hr).
While I am waiting on a working video pcb, I was thinking replacing that Altera chip could theoretically fix that bus error. However, that chip being a EPM7064 LC84-15 is actually a CPLD meaning some additional programming/burning would need to be done...that is unless something else on one of these System Super 22 boards does the programming itself.
Because replacing a video pcb on a System Super 22 is possible...
- What does that Namco C407 chip actually consist of and the differences between the C407 and Altera EPM7064.
- Are both an MCU that stores some video related info?
- Is any additional programming required before replacing that chip? Any contents to dump from either?
- Does either chip have contents burned from a program rom?
Yes I am aware that chip is surface mounted meaning replacing will take a lot more skill hence why I'm saving this application for later hopefully once this feature is understood.
-.-
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Namco System 22 Video PCB
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