11 May
2012
11 May
'12
11:53 a.m.
I have one of these cards, given to me by one of the
IBM old timers I see
from time to time. He is one of the original engineers for it. So, second
hand from the horses mouth - no, not bubble memory. The card was designed
specifically for use in the 5155, for some reason.
I suspoect it was designed for the 5155, but it can be used in the 5150
and 5160 too.
The point being that the 5155 layout is differnet to the otehr machines.
Since the CRT monitor and PSU take up the entire elft side of the case,
the motherboard is mounted towards the right side (not the left side as
in the desktop machines) and thus most of the expansion slots are right
behind the floppy drives. So only 'short' cards will fit. Making a
'short' memory card that would go in one of these slots was obviosly
useful for such a machine.
Why they didn't just put the memory on the motherboard, which they ahd
designed to take it, is mystery, though.
-tony