Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/18/84; site brl-tgr.ARPA Path: utzoo!linus!philabs!cmcl2!seismo!brl-tgr!tgr!crash!kevinb@sdcsvax.ARPA From: kevinb@sdcsvax.ARPA Newsgroups: net.micro.cpm Subject: S-100 bus board problems Message-ID: <520@brl-tgr.ARPA> Date: Thu, 8-Aug-85 14:51:30 EDT Article-I.D.: brl-tgr.520 Posted: Thu Aug 8 14:51:30 1985 Date-Received: Sun, 11-Aug-85 06:05:23 EDT Sender: news@brl-tgr.ARPA Lines: 23 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}