USR quad modems... (ontopic - really!)

Tony Duell ard at
Sat Aug 19 17:51:00 CDT 2006

[CoCo 3 GIME]

> >> 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.

Sure. But I think the only timing diagram is a 'representative' one 
showing a normal cycle. No idea if it does other types of cycle as well.


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