Amiga.org
Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: chriscampbell on August 24, 2021, 07:57:04 PM
-
Hi everyone,
I am hoping that someone can help me out a bit here. I have been working on cleaning up and upgrading my Amiga 500. I keep getting the occasional yellow screen on boot. After doing a lot of reading it looked like my CPU was maybe trying to write to some bad RAM. On one of my stable boots I ran a RAM test and sure enough I came back with a problem in one of my chips. I am looking to replace them but I am not sure how to find a replacement. I looked on ebay and found a couple of sellers who were sellling some obviously cut up boards.
https://www.ebay.co.uk/itm/224503285754?hash=item34457047fa:g:eUUAAOSwKIlgzfMB (https://www.ebay.co.uk/itm/224503285754?hash=item34457047fa:g:eUUAAOSwKIlgzfMB)
I have an Amiga 500 Rev 6A board that has 512 kb of RAM on it in 4 chips. Would this be what I would be looking to get? Or is there another root I can go where new chips may be available? Any help would be appreciated. Thank you.
-
The 256kb x 4bit DRAMs are easy enough to find as new old stock on Ebay, search for TC514256AP. The speed doesn't matter, i.e. you can use -70 or -80 parts. Make sure the package type is DIP20, not ZIP.
You can populate the other 4 optional ICs for a full 1MB on board if you don't already have a 512kB expansion module, though you'll need to move a couple of links on the board to make this work.
-
Thanks. I will look that up and order some. Hopefully I can get my A500 back on its feet.