IMSAI (moving along...)

From: Bill Sudbrink <bill_at_chipware.com>
Date: Thu Jul 8 10:10:37 1999

> 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
Received on Thu Jul 08 1999 - 10:10:37 BST