Posted By
crock
on 2016-02-12
04:41:14
 |  Re: Blank cartridge boards
Hi MMS, the standard size of a 264 series cartridge is 16 or 32k, but the maximum size natively supported is 64k, with two banks of 32k ROM overlaying the basic and kernal ROM spaces from $8000 -> $FFFF, excepting the IO areas. This is all under software control by writing to the quasi-ROM select registers at $FDD0 - $FDD3.
As I said in my earlier post, the signals to select banks are exposed on the cartridge port but the only cartridge I know of that made use of them was Dave Haynie's prototype 264 mega-cartridge which he sold on ebay a couple of years ago.
I had dinner with Dave a couple of weeks ago, would have been an interesting topic to discuss.
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