11 May
2012
11 May
'12
11:19 a.m.
On 11 May 2012 at 13:28, B. Degnan wrote:
UPDATE: I did not find the card listed in any manuals
that I have,
but I did find a reference to the 32-pin DRAM. If I were to guess,
you'll find this card as an option specific to the IBM 5155 portable,
to boost the system up to 512K. It's a small card, perfect for the
smaller 5155 chassis. I should mention that I got this particular
5155 with the 256KB RAM card from an old IBM tech who wanted to find a
home for some of his bench gear.
The O&A mentions that it's designed for a 4.77MHz system, so that
sort of limits the possibilities. The module is extremely compact
for the time--9 x 64K each. The downside is that they're 3-rail
units--and probably close to unobtainium nowadays.
As I mentioned before, the thing *is* completely documented in the
O&A.
--Chuck