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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: DiskChris on August 14, 2014, 09:23:32 PM
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I'm looking to put some ram on my a2091, which according to amigaresource (http://amiga.resource.cx/exp/a2091)would be 4x256k dip. However, the card has 16 sockets and a max of 2 MB...Wouldn't that be 4 MB of ram if each chip was 256k??
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Has to do with some obscure and long-forgotten (except by some people on this board) conversion, kilobit vs kilobyte, etc. I honestly don't remember anymore! But the maximum ram capacity of that board when fully loaded is 2MB. Sorry! You might try adding a 32-bit accelerator, or a Zorro-II memory card, or one of those Kipper2K cards that fits underneath the processor, etc., if you want more. :)
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Ah yes that makes sense....Can you mix manufactors and speeds? I'm kinda finding a few here and a few there....
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I'm looking to put some ram on my a2091, which according to amigaresource (http://amiga.resource.cx/exp/a2091)would be 4x256k dip. However, the card has 16 sockets and a max of 2 MB...Wouldn't that be 4 MB of ram if each chip was 256k??
The chips are 256 kilobits, 4 bits wide. 1 byte = 8 bits so you'll need two chips to give 256 kilobytes.
Zorro II memory is 16 bits wide which means you'll have to add 4 chips in parallel (as they are 4 bits wide) 4x256x4= 256x16 = 512x8 (512 kiloBytes)
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Yeah I was thinking in bytes not bits....And I managed to find some which should work, but I can only get 5...Would I be able to get different manufactors/speeds in the future assuming they were 4x256k and at least 120ns??
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.Would I be able to get different manufactors/speeds in the future assuming they were 4x256k and at least 120ns??
It's possible to mix chips. I've used a few 2091's over the years and used anywhere from 80-120ns chips from different manufactures. Do some home work though and make sure pinouts and other specs match up as not to hurt your card or other chips.
Plaz