Ape Cosplay
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I've counted 66 I/Os and was planning to use PLCC84 devices (because I have them handy and you can install a socket either THT or SMT) plus a single gate LVC04. Miscount on my side?
Repo MVS Cart PCB Discussion
- Thread starter Fluffy
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Getting this to work with the PLCC84 version would be perfect for those reasons. It is quite possible that I made some mistake when setting up the project. It is a bit of a pity that they are out of production, but there should be still enough NOS for quite some time.
A short discussion about modern MVS bootlegs brought the question of the availability of open-hardware cart boards.
Surprisingly a Google search returned a useful result: this thread ! What a coincidence.
If using a CPLD for PCM turns out to be a problem, an equivalent can be made with ~10 standard logic chips.
The schematic might be more useful than the HDL: https://github.com/furrtek/SiliconRE/blob/master/SNK/PCM/PCM_schematic.png
Same goes for NEO-ZMC and NEO-273. Space could be an issue however if the CHA board is already full of 27C322's.
Surprisingly a Google search returned a useful result: this thread ! What a coincidence.
If using a CPLD for PCM turns out to be a problem, an equivalent can be made with ~10 standard logic chips.
The schematic might be more useful than the HDL: https://github.com/furrtek/SiliconRE/blob/master/SNK/PCM/PCM_schematic.png
Same goes for NEO-ZMC and NEO-273. Space could be an issue however if the CHA board is already full of 27C322's.
Yes, explored in this very thread: https://www.arcade-projects.com/threads/repo-mvs-cart-pcb-discussion.20048/page-2#post-310183 
Two problems: Space and money. Adding all the logic chips in DIP packages takes quite a bit of space, moving to SMD increases the difficulty. And all the separate logic chips add up, using a single CPLD is much cheaper, solving two problems at the same time.
Two problems: Space and money. Adding all the logic chips in DIP packages takes quite a bit of space, moving to SMD increases the difficulty. And all the separate logic chips add up, using a single CPLD is much cheaper, solving two problems at the same time.
