Re: SIMMS for IIgs

[a_specto@alcor.concordia.ca (Mitchell Spector)]

"william strutts" <wrstrutts1@nospam.home.com> wrote:

>Okay,
>
>This is getting frustrating.  I have two 1 meg simms from a Mac
>Classic II which are of the two chip variety and they don't work
>on my Q-RAM card.  Then I read that they need to be of the
>eight chip variety.  Today, I found some OKI 120ns 8-chip simms
>and put them in and they don't work either.  What gives?  What
>exactly kind of SIMMs does the IIgs require?

    Of existing IIgs memory cards that support SIMMs, they'd have to 
fall under this set of guidelines: Either 256K or 1MB SIMMs, 8 or 9 
chips on the PCB (meaning 1 bit chips--parity or non-parity), 30-pin
(8-bit), and at least 150ns or faster. CAS before RAS refreshing may
not be an issue, I've never heard of SIMMs which use the reverse
order.

    The other thing to watch for is the card's configuration. Often you
have to set DIP switches or jumpers to tell the card which sockets
are populated. If your not fully populating the card, you may have to
plug them in a certain order. Finally most cards only accept one type
of SIMM or the other (all 256K or all 1MB, not a mix).

Mitchell Spector
a_specto@alcor.concordia.ca