On 2012-09-12, at 19:34, Gerrit Heitsch wrote: >> Are there any indications against using eventually e. g. 128K of low power S-RAM for everything? I mean.. putting aside the mechanical complexity of the adapter required. 128Kx8 SRAMs seem to be easily available and far less expensive than a set of 4164s (or even 41464s) and 4114 these days. Where is the catch, if any? >> > > There is a small one. I have built an adapter to use a 128K-SRAM (ALLIANCE AS6C10008-55) on a 250466. You need the RAM, a 74HCT573 as the demultiplexer and a single OR-gate (I used a 74LS32). [..] The LE-signal for the 74HCT573 is connected to _RAS. The OR-Gate takes _RAS and _CAS as inputs and the output is the _CS signal for the SRAM. And then using the second half for colour RAM replacment will be as easy as ORing it with _CS for 4114, routing 4114's _CS to SRAMs A16 and ORing R/_W? -- SD! Message was sent through the cbm-hackers mailing listReceived on 2012-09-12 19:00:06
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