Re: Where to get RAM for IIGS

[Roy and/or Janet Miller <millers@inetnebr.com>]

Mark Cummings wrote:

> Ryan,
>
> Oh, the EHP/EGPxyzt on the chips would be just a batch number, nothing to do
> with the type number TMS 4256-12/15. the 4256 would mean 4 bit x 256K bit,
> so 2 chips would make 256K RAM, or 8 for 1MB.

But that may be a problem. The banks on the Apple Expansion card are for 256K
bit x 1 bit. If he has 4 bit wide chips, could that not create the problem that
he has described?

Roy

> And the -15 is 150ns
> whereas -12 is 120ns. Anything below 200ns should be fine. the N in NL means
> a plastic package as opposed to ceramic etc.
>
> Mark
>
> Ryan Tremblay wrote in message ...
> >Ok I happen to find a 286 in my basement that got donated to the Internet
> >Club from the college I attended (long story) anyway I took the chips out
> >and added them to the IIGS RAM Expansion card.  I turned it on and it will
> >not recognize it.   I noticed on the chips  the soldered on ones say TMS
> >4256-15NLA on the top and EHP 8749 and an A on the bottom.  The ones I put
> >in say  TMS 4256-12NL on the top and EGP 8740 on the next line and nothing
> >after that.  I assume it needs the same specs on the ram I put it for it to
> >work?  I also noticed I had some inserted than the rest of them are I was
> >curios if that was the problem but I fixed it and still no luck.  Is it
> >better off buying another board with more RAM?  Please help.