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

["M. Pender" <mpender@hotmail.com>]

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