"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.
I question your last '0'. They did have 6P, 6C, 6G.
The HM50256 is an Hitachi 256k x 1 dram memory chip.