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Old 22 August 2015, 03:25   #1
toddbailey
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Is there a list of know working memory parts available

I'm looking to add scm zip memory to the A3000. My supplier only has 80 ns available
sadly, Too slow, I'm looking for 50, 60 or 70ns max.

Is there a qualified vendor list that I can browse through?
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Old 22 August 2015, 06:08   #2
mech
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Quote:
Originally Posted by toddbailey View Post
I'm looking to add scm zip memory to the A3000. My supplier only has 80 ns available
sadly, Too slow, I'm looking for 50, 60 or 70ns max.

Is there a qualified vendor list that I can browse through?
The 3000 was designed to use 80ns fast ram iirc. faster chips are likely not to do anything unless you are overclocking or some such-i could be wrong though
I have never seen a 50ns 1mx4 zip,but likely they did exhist,good luck finding them

There is no vendor list i know of. zips are long past their "prime" and new/old stock most likely.
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Old 25 August 2015, 01:31   #3
toddbailey
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What I am looking for is a list of known working part numbers and their mfg.
For my particular instance I only know of 1 part number/mfg that works with out any drama in the 16 mhz version of the a3000 (rev 7.5)

oki m514402a-70z scm

the replacement Fujitsu MB814400a-70psz fpm

does work if you manually turn off the 68030 cache and burst mode

problem is your can't boot from floppy w/o editing the start up scripts, and for propriety disk you are just plain out of luck.

In a nutshell, a simple cross reference guide with known working zip memory numbers would be appreciated

I'll be trying out a 25 mhz mod (clock and socket) and will report back.
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