Re: New Pile of Mystery Boards

[ENG8S2M@leeds.ac.uk (Seb)]

Jeff Lemke wrote:
> 
> 5.  IIEasy RAM Memory Upgrade, Copyright 1989 by PaceMark Technologies,
> Inc.  Very small board the size of a business card, on red baseboard.
> Only 4 chips, plus some resistors.  How much RAM was this?

What's written on the chips?

> 13.  AII Memory Expansion.  Apple Computer, 1985.  Currently has 16
> memory chips on it.  There are spaces for 16 more.  How much RAM would
> this card accommodate?  One set of memory chips say "MCM6256BP10" on
> first line; the other set say "KM41256AP-12" on the first line.  Are
> these chips still obtainable?

I'm not a specialist, but I guess the "41256" chips are 256Kbits*1,
therefore you would need 8 of them to get 256Kbytes, from which I
conclude that you currently have 512Kb (I imagine the "6256" are similar
chips, but I might be wrong). If there's space for another 16 chips,
then you might go up to a whooping 1Mb of RAM!
-- 
          _  Proud Amiga owner since 1988, Computer collector since 1998
         | |
 ___  ___| |__  Amiga 500, Commodore 64, Apple IIe, Macintosh SE fdhd,
/ __|/ _ \ '_ \  Acorn Electron, Acorn BBC B, Acorn Archimedes 3000,
\__ \  __/ |_) |  Cambridge Computer Z88, Sinclair Spectrum+,
|___/\___|_.__/  Commodore 128.