🚀 go-pugleaf

From article <4338@deimos.cis.ksu.edu>, by paryavi@harris.cis.ksu.edu (Saiid Paryavi):
> This would probably only interest hardware hackers ...
> 
> I opened up an old 512KE Mac to see what the DRAM chips were.  I found out
> that there are 2 rows of 8 socketed chips in each row.  The chips are 256K bit 
> DRAM chips.
> 
> What I am wondering about is if it is possible to just take those 256K bit
> chips out and plug in 1 Mbit DRAM chips to upgrade the RAM to 1 meg!!!!
Well, the big problem is that the 256K parts have fewer pins than the 1 Meg
parts. You would have to provide more address lines. (and address 
multiplexors for the address lines.) It would be a pretty involved hack
to do this. Also, the 1 Meg parts are physically larger, so I'm not
so sure you'd be able to physically cram them into the space that had
been provided for the 256K parts. 
You'd probably be better off getting one of the 3rd party memory
upgrades. They can sometimes be bundled with a SCSI port, which
converts your 512KE functionally to a MacPlus.

BTW, if you did replace the 256K parts with 1Meg parts, you would end
up with 2 Megabytes.
-- 
Frank Owen   312-982-2182
AT&T Bell Laboratories 
5555 Touhy Ave., Skokie, IL  60077
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