Michael J. Mahon wrote:
heuser.marcus@freenet.de wrote:On Dec 1, 7:39 pm, "Paul" <go.s...@yourself.man> wrote:I want to add more RAM chips to my IIe RAM expansion card (genuine Apple). The prepopulated chips on the card now are TI TMS4256-15NL. From what I've read on a few web sites, I should be able to add 41256 chips that are 150ns or faster to this card. I just want to make sure this is correct, since thechips on the card don't specifically say they are 41256 chips. I figure someone here has to know.The TI chips are 41256 with 150ns timing. You should be able to mix them with ones from other vendors. For added safety: Add them as groups of eight identical chips.And the timing isn't critical. Anything faster than 200ns should be fine. (I forget what the max access time spec really is.)
Oops--I meant 200ns or faster. ;-)
FWIW, if they're fast enough, identical in a bank shouldn't matter. They can't be too fast, and if they're fast enough, they'll work. -michael NadaPong: Network game demo for Apple II computers! Home page: http://members.aol.com/MJMahon/ "The wastebasket is our most important design tool--and it's seriously underused."
-- -michael NadaPong: Network game demo for Apple II computers! Home page: http://members.aol.com/MJMahon/ "The wastebasket is our most important design tool--and it's seriously underused."