I was thinking to something simple, a small flash / eprom with a menu to load a cartridge image to a ram mapped at the cartridge location and write protected the vic20 is quite far for me :) I've not really use one since 1985... (except to repair and play a little bit with the board I just repaired so I'll have to check that I'm not totally wrong :) about this machine -- didier On 11/07/2015 08:56, Marko Mäkelä wrote: > On Sat, Jul 11, 2015 at 08:02:01AM +0200, didier derny wrote: >> I'll probably end with a small board plugged on the 6502 socket with >> 6502 + gal + ram to implement only the ram and let the cartridge >> connector free > > The 6502 socket sounds like a reasonable approach. Maybe add a small > 5-volt Flash ROM for some auto-start firmware, to save typing when > loading software. The software would be loaded from some external > source, such as the SD2IEC. Basically, a simple loader would load an > image file to the appropriate RAM banks. Compression is not really > needed. > > Some years ago, I finished the Vic Flash Plugin that was under > development for the best part of this millennium: > http://www.iki.fi/~msmakela/8bit/vfp/ > > The Vic Flash Plugin cartridge uses the 5-volt Flash chip Am29F032B > which probably is big enough (4MiB) to host all Vic-20 software ever > written. It was difficult to obtain even back then. The hardware was > never sold. > > Marko > > Message was sent through the cbm-hackers mailing list Message was sent through the cbm-hackers mailing listReceived on 2015-07-11 12:00:07
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