USR quad modems... (ontopic - really!)
THX1138 at dakotacom.net
Fri Aug 18 17:08:57 CDT 2006
Tony Duell wrote:
>>> It's probably possible to add external circuitry to turn that back into a
>>> normal 18 bit address and hang SRAM off it, but I think it's more work
>>> than finding some 41256s...
>> I would assume the controller would exploit page mode references
>> (especially when dealing with sequential accesses like video).
> I am not sure, and the service manual (which I have) doesn't make any
> obvious reference to this.
Any timing diagrams for DRAM access? You'd recognize the page mode
cycles by the lack of a 1:1 pairing of RAS with CAS.
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