On 5/22/2018 4:07 PM, Nejat Dilek wrote: > Nice project! > > Does this also use hacks around the PLA like EasyFlash? I guess it depends on what one defines as a "hack". This unit simply engages the GAME line anytime a memory access that should be outside the C64 is requested. I think that is standard behavior. > > Why not use pages of 8 / 16Ks too? As I looked at the Ultimax map, all pages except for 0-fff and d000-dfff were movable. Doing 8kB means one needs to map in a bank, but can't use all of it. It seemed cleaner to map on 4kB boundaries. One can handle 8 or 16kB by simply using 2 or 4 consecutive banks. > > I had once a simpler ram extension idea employing the same concept in > below old project which was published in the Transactor. (But of > course with a bigger 512K or 1MB sram) Well, my solution uses a 512kB RAM, and will support up to 256MB. > > > > It would be nifty to have some external storage mechanism in the cart > too. It would be really cumbersome to load content into this > additional ram from the disk drive. True, and that's a nice thing to consider. I mainly want to understand if anyone sees value in the MMU or the memory before I pursue more work (I built the board for other reasons, but decided to implement this functionality while I was testing the board asembly). > > Regards, > > Nejat > -- Jim Brain brain@jbrain.com www.jbrain.comReceived on 2018-05-23 02:00:12
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