Re: 16-pin RAM chips: Buffered Grappler Plus question

[dg04@ns1.cc.lehigh.edu (DAVID GRUMBINE)]

In article <1993Sep7.003934.370@presby.edu>, sebugg@presby.edu (Stephen Buggie)
writes:
>
>Recently I acquired a BUFFERED GRAPPLER PLUS parallel printer card
>with eight sockets to hold 16-pin RAM chips totaling 64K.
>
>Presently just two of the sockets contain RAM chips.  These chips
>have the following  Motorola numbers:
>
>MCM6665BP15
>FQQ8516
>
>QUESTION: What Ram chips can be added to these?  I have a number of
>these chips:   41256-15

41256 chips are 256kx1.  These won't work.

>Will these chips work?  Should I remove the two Motorola RAM chips
>so that all the chips are identical?
>I read that the speed of ram chips should be uniform within RAM banks.
>How critical is this?

>I also have some 4164 chips; are these compatible with the Buffered
>Grappler Plus?

These are probably the best bet.  64k using 8 sockets probably means 8 chips
of 64kx1 which makes 64k x8 which is normal for Apple stuff.  But you might
want to check on sci.electronics to find someone to look up a cross-reference
to the actual chips you have in the board, just to be safe.  Or go to a
library and check it out in the IC Master yourself (although this isn't a book
most public libraries are likely to have).

Good luck!
-dave
-- 

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The oppinions expressed above may or may not be my own.  But I'm not telling.

Physics is fun! ....  Honest.
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Dave Grumbine, Jr.       dg04@Lehigh.EDU