Re: Memory Card question

[dempson@actrix.gen.nz (David Empson)]

Wayne Stewart <waynes@intergate.ca> wrote:

> David Empson wrote:
>  
> > My point was that the Apple II card might be able to work with even
> > slower RAM.  The IIgs card needs 150 ns or faster (some cards need 120
> > ns), but the Apple II card might work with (say) 180 ns.  I don't have a
> > manual for the Apple II card, so I can't check this detail.
> 
> Looking through the manuals for the Apple II and IIgs cards and the IIgs
> hardware reference and IIe Technical reference, I can't find any reference
> to the speed of the RAM chips for the two cards.  Just repeated references
> to buying 256k kits from Apple.  Well, I guess you could stretch it and
> say there was one sort of reference, the box the Apple II memory card came
> in has a picture that shows 200ns RAM installed.

That settles it - the implication is that the Apple II memory card will
work with slower RAM.  200 ns seems like a reasonable lower bound, but
it might work with even slower RAM.

Don't forget that this card is operating at 1 MHz, while IIgs memory
expansion cards have to be able to operate at 2.8 MHz.

-- 
David Empson
dempson@actrix.gen.nz