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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: darkcoder on September 12, 2005, 05:58:59 PM

Title: RAM for A2000 A expansion
Post by: darkcoder on September 12, 2005, 05:58:59 PM

Hello
 
 I have an A2000 A rev. 4.0. Such a model came with an internal memory expansion board (for info see TBBoAH, RAM expansions by Commodore). My board has 16 DRAM soldered giving 512K and 16 empty sockets. I would like to fill sockets providing extra 512K, but I am not sure which type of DRAM is good. The soldered ones are TMS 4257 chips, 256Kbit, organization 256x1, 150ns. Since it is not easy to find exactly those chips, I am considering other chips also,but which are good? Of course 256Kbit chips, but is any organization good? Also the TMS 4257 are "nibble mode" chips,as opposed to "fast mode" ones. Is it necessary to place "nibble mode" chips? If so,is there a way to deduce this characteristics from the chip ID?

regards

Title: Re: RAM for A2000 A expansion
Post by: Amiga4k on September 14, 2005, 07:08:53 AM

Why not just buy populated RAM board, and be done with it?
Let me know if your interested in some 8 meg boards.

Title: Re: RAM for A2000 A expansion
Post by: Chain on September 14, 2005, 09:38:57 AM

I have same board, half populated. let me know if you find those chips somewhere