On 06/18/2013 07:58 PM, Ruud@Baltissen.org wrote: > Hallo allemaal, > > > The good news: I replaced the unmarked ICs with marked ones and > things worked out fine! The schematics look a lot like the banking logic used in the 264 series. The C16 uses also uses a 74LS02 and a 74LS175 for this purpose. I wonder if the designer was inspired by it. Your cartridge does not use the R/_W signal though, meaning that just reading the I/O-area will change the contents of the register. > Also notice that, although you find 27C256s in the schematic, pin 1 > can be controlled as well. So one could use 27512s as well. IMHO a > design usable for other purposes as well. If I was to use the circuit for something else, I'd change the logic so that only writing to the I/O-area would change the banking register. Unless I'm completly mistaken, you should be able to add R/_W to the mix with the 2 unused LS02 gates. Gerrit Message was sent through the cbm-hackers mailing listReceived on 2013-06-18 19:01:19
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