1 Dec
2001
1 Dec
'01
11:46 p.m.
On Sat, 1 Dec 2001, Robert Schaefer wrote:
Anyone know what this is? It came from a 256K IBM XT,
I thought at
first it was a video card, (it was in the first slot), but it's got
eight banks of nine 41256 ram DIPs on it. That sounds like a lot for
a mono video card, doesn't it? Combo card? it's got a looong
double-row of pin sockets along the bottom just above the ISA
connector, and another single row up the whole edge between the
external connectors (male 9 pin & female 25 pin) and the components.
Maybe a daughter board? It's got one 6-position DIP switch at the top
right (^vvvv^) and 3 three-pin jumpers along the top near the rams,
(xx. xx. xx.) It's got a couple've big (1/8") holes on the board,
lending credence to the daughterboard theory. All the chips are
labeled in an intersting way-- u84 158 is --get this-- a 74LS158N.
Don't ya wish everything was made like this?
This sounds like a memory expansion+i/o card, with functions similar to
the well known AST Six Pak Plus board. Does this card also have a 26 pin
header somewhere for the second serial port? Does it have a battery for a
real time clock? Make sure you write down the board's current dip switch
settings if you decide to try changing anything...
-Toth