That "double" card sounds like a memory expansion card.  I have an old Intel
"Aboveboard" at the shop, which _might_ be like it.  Check all those 54
socketed chips.  Each chip should have a code like "XXxxx64x-20", and each
row of 9 should all be from the same manufacturer.  "XX" is a clue to the
manufacturer, if it does not have a recognizable logo.  "xxx64x" indicates
64K. Being in groups if 9 (6x9=54) indicates 8 bits-per-byte plus parity.
"-20" indicates 200 nanosecond response time. That would give you 384 K,
with 640 K on the motherboard, for a total of 1 Meg RAM.

Unfortunately, there is not much advantage to be gained by the extra 384 K,
especially as it will be operating at the ISA bus frequency, and not as
fast as the memory on the motherboard.  The error message could be due to
a bad chip (probably one of those socketed memory chips), but is more likely
due to a wrongly set switch.  You could try putting it in and changing one
switch at a time (while the power is off) to see what happens when you
reboot.  If you return each switch to its original position before
changing the next, that is only 8 reboots.  Record and compare results
for each setting.  One or more should work, although not likely for the
full 1 Meg of RAM.

A better possibility would be to find some cheap old 1 Meg SIMMS that will
fit, and install 4 Meg which will run at the motherboard frequency.

Have fun with it!

Boyd Ramsay

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