Date   : Tue, 23 Jul 1985 18:08:43 PDT
From   : crash!kevinb@sdcsvax.ARPA
Subject: S-100 bus board problems

I am new to the S-100 area, and having gotten an old IMSAI chassis with power
supply and motherboard, I am eager to make sure it's up to snuff before I
plug anything else into it. I am getting +11 on pins 1 & 51, +21 on 2, -21 on
52, 0 on the grounds (20,50,70,100) and about 2.3 or 4 everywhere else. Is this
normal? If not, a) is it within acceptability and b) if not, what kinds of 
hints can you-all offer to help fix same? These values were tested WITHOUT 
boards, and I only plan to put in 1-3 boards in for quite a while.

  The name of the above is the PCS-80/15 microcomputer, using the EXP-10
motherboard, and the MBU-B 8085-based CPU. The motherboard also has traces
cut at the terminator at pins 71-74,75 being blank,76-78,79 being reconnected,
and 99. Also, the CPU board has spaghetti and cutouts around U31, a chip with
the label N82S31N 7734 and the label is an S. This chip isn't in the original  
assembly instructions, which is ALL I have.
  Anything of help on this, would also be a godsend.
  I can do without the CPU, but I've got an Advanced Digital SUPER QUAD I can
drop into the motherboard, once it gets working.

                       Thanks in advance,
                               Kevin Belles

Kevin Belles - UUCP {ihnp4,cbosgd,sdcsvax,noscvax}!crash!kevinb
~~~~~ ~~~~~~ - ARPA crash!kevinb@{nosc,ucsd}