8 Jul
1999
8 Jul
'99
6:10 a.m.
What all sets of jumpers does your boards have on it?
If the layout is similar, I can pull one of the boards
(and or docs) down and probably give you some more
information.
OK, here's what I see:
Component side:
4 voltage regulators evenly spaced across the top.
(checked voltage on each of these... 5.00 volts according
to my digital multimeter).
Top Center:
INDUSTRIAL
MICRO
SYSTEMS
8K MEMORY BD.
Between the two right VRs (labeled VR3 and VR4):
I <micro symbol> S
C00231
Sixty-four 21L02HPC chips arranged in two blocks,
each consisting of four rows of eight chips with
pin 1 down and to the right.
Between the two blocks (also with pin 1 down and to
the right) are seven chips and two jumpers arranged
something like:
J1 7 .. SN
6 .. 74 . J2
5 .. LS .
4 .. 13
3 .. 8N
2 ..
1 ..
0 ..
RA SN
15 74
-4 LS
.7 13
KN 8N
N8 N8
T9 T9
7N 7N
74 74
LS LS
37 36
A 7P
C
J1 is presently jumpered at 0. J2 is presently open.
That's it really, nothing else of note except that there
are four components missing: CR1, CR2, CR3, CR4. Each
next to the corresponding: VR1, VR2, VR3, VR4. It looks
like they were never installed. Again, I checked the
voltages and they were 5 volts right on the money.
Thanks,
Bill