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Re: Laser 128 - 1MB Memory Exansion Card - Question?



M. Pender wrote:


On 4/18/04 1:36 PM, in article 1085f4qeap1k7b2@corp.supernews.com, "Laine
Houghton" <laine@intergate.com> wrote:



"Robert Steinmetz" <not-rsteinmetz@mindspring.com> wrote in message
40828B75.4050405@mindspring.com">news:40828B75.4050405@mindspring.com...


Willi Kusche wrote:


Hi!

Robert Steinmetz <not-rsteinmetz@mindspring.com> wrote in message


news:<4080CA65.1090503@mindspring.com>...


I have a 1MB Laser 128 Memery Expansion Card. It has 4
banks of memory (8 chips per bank) of which only one
is populated. Although I have the original box I don't
have the original documents.

Can some one confirm the requirements for memory to
populate the remaining 3 banks?



   There's a high probability that it uses 41256 chips.

Willi


I've pulled the cad and the chips are HM502560-15. As
far as I can tell this is 1x256k chip and I have room
for 3 more banks of 8.

Can someone please provide more information on this
chip and a source for them?

Is this chip compatable with any other common chips?


When I scanned the section of the laser 128 manual on the 1 meg board it
said to fill it with 41256 chips.

Any 256k x1 dram chip (-15,  150 ns) or better should work.



120 ns for the 128 ex and ex/2.

- Mike
Even the EX only ran at 3.6 mhz, and 200 ns was plenty fast for the 4.77 mhz 8088. Of course, as time went on faster RAM was, at times, all that was available, and 120 ns will work if 400 ns will work.... 

Roy






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