Hi! MagerValp wrote: > I'll try to write something up when I'm done. The current projects on > Funet all require logic chips and a small PCB, I'm aiming for just > wires and memory chips. > 6264's are 8K Static RAM (SRAM) chips that are almost pin compa- > tible with 2364 ROM chips. This enables you to solder the 6264 on top > of the ROM chip (aka piggy-backing) and just rewire 6 pins, instead of > having to wire all 28. It's a quick and dirty solution, but it works. I also built the mentioned VIC-20 memory expansion board by Adam Bergström (a slightly modified version that can also map RAM to the RAM1'-RAM3' blocks, but no real difference). I also designed and manufactured a PCB for it (I should upload it somewhere...), but first I built it on a small piece of protoboard (assembled inside the computer; there is plenty of room, and I could connect wires to all appropriate contact points). It was really easy to do. Probably even less risky than piggy backing some chips inside the VIC. As Pasi has mentioned, a 32k static Ram also shouldn't be too expensive (or you can even obtain one from the PCB of some older HDD wrecks ;-) ). > The Vic-20 is a *very* simple computer, almost everything is done > with standard 74xx logic chips. Check the scematics on Funet, Booh... I always get confused when I have to dig into the schematics, because of those _lots of wires 8-/. Regards, L. - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail firstname.lastname@example.org.
Archive generated by hypermail 2.1.1.