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PostPosted: Wed Jan 06, 2016 8:57 am 
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Joined: Wed Jan 06, 2016 8:23 am
Posts: 10
I'm trying to make a Block Out repro (128KB) with a copy of Pachio-kun 4 (512KB) and a Winbond W27C020-70 EEPROM.

I don't know what to do with the other pins (/OE and /PGM), how to deal with the bigger EEPROM, or how to wire it.

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PostPosted: Wed Jan 06, 2016 10:52 am 
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Joined: Mon Jan 23, 2012 11:27 pm
Posts: 141
To put the rom on a larger chip the usual practice is to duplicate data to fill. This allows you to do whatever you want with the extra address lines. I wrote famirom to streamline that process if you're not familiar with doing it. http://nintendoage.com/forum/messagevie ... adid=63070

For wiring it's the usual Nintendo scheme. For this application you can simplify it to this:

prg

pin 1 up
pin 2 -> hole 24
pin 24 -> GND
pin 30 down is fine as long as you double your rom properly


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