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Atari 600xl 64k memory upgrade methods


dimfil

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What about this guy?

https://www.ebay.com/itm/10x-NEC-UPD41256C-10-D41256-256K-100ns-PAGE-MODE-DRAM-16-DIP/113130079041?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

Edit: I am sorry, these are not good for the 600xl without major changes. These that I just posted are 1bit RAM (256k), good for changing those MT damaged ram chips, typically found on 800XL and first revision 65XE.  

 

Edited by manterola
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  • 6 months later...

Necro-ing this old topic to report that I used @Mathy's instructions linked in one of the posts above to upgrade one of my 600XL's tonight. I know it's an easy mod, but it's still always nice when something works the first time. For the replacement memory, I used some NEC 41464-10 chips I bought on eBay over a year ago. I just never got around to this upgrade until this afternoon.

 

 

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I did it the 'hard way' ?

 

I modified the system such that no chips are soldered to.  Changes on the bottom, changes under a chip socket or two, and now it's as if it was 64K from Atari.  Chip fails, pop in a replacement chip.

 

In retrospect I think I should have just used the 64K SRAM that IIRC goes between the cpu and socket.  Then you can pull several components from the PCB as they aren't needed anymore.

 

But I still like the way it turned out.... but it was a real pain when I discovered I had to pull one or two chip sockets to separate a connection I didn't know were hiding under there ?

 

 

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6 hours ago, cwilbar said:

In retrospect I think I should have just used the 64K SRAM that IIRC goes between the cpu and socket.

I know Lotharek makes one now but even then you need to solder at least one wire to the MMU or a nearby via. His site also said that some upgrades might need you to solder a second wire. Seems to me that if you’re soldering wires anyway, might as well go with the one that’s cheaper - which in this case was these memory chips ($3.09 on eBay last year for a lot of five chips :) ). 

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