Thanks for the tip on the jumpers on the back of the PSU, Tony. I have manufactured a replacement and after reseating the boards, I appear to have a working PDP-8/e CPU once more. I have misplaced a box of parts (go figure) so am missing the bulk of my over-the-top jumpers, so the core testing will have to wait for another day, but I currently have the chassis and PSU sitting side by side on the table (the base from a scrapped RM02), leaving me enough room for a hex-height 16K MOS card to hang over the side of the OMNIBUS. Preliminary testing shows that all is well. I can store and retrieve numbers from the MOS memory, enter run state, single step and halt. All the bulbs appear live. I am only missing the knob off the front panel so I have to guess what mode the bottom row of lights is in. Next step - RX8E and try to boot OS/8. Failing that, back to the papertapes. On _that_ note... one of the other goodies I unearthed this weekend is a portable papertape reader used by DEC FS when diags still came on tape but customers had moved on to VT52s... it's a PR/S01. I have zero docs on this thing and have no idea what baud rate it defaults to. It is a 20mA device with a male and female connector - one with 4 wires marked TERMINAL, the other with 6 wires marked READER. How to hook it up seems obvious (I need to unearth my box of 20mA cables). How to strap the TTY card less so. I do have diagnostic tapes; as soon as a friend of mine loans me his 20mA-to- RS-232 converter, I expect to back up four boxes of diags and utils (none of which I expect are unique in the world - it's lots of MAINDEC and DECUS stuff) I did attempt to place two different KK8A modules in the -8/e box in place of the KK8E. Toggling the Load Address switch only incremented the MA lights in either case. I do not know for certain if these particular boards are working, but what is the expected behavior for the combination of a PDP-8/a CPU and a PDP-8/e front panel? Is it supposed to work? I know you can stuff a KK8E in a hex-height OMNIBUS box. That was a supported configuration. Also, where can I get a diagram describing the function of the DIP switch on the KK8A? ISTR that only one or two switches have any beneficial effect, but it's been more than 10 years since I have had to change one and I forget what they do. Furthermore, is there a good page to reference for some trivial toggle-in programs for basic test/checkout? I can write a couple, but if there are some pre-done ones, I'd rather start there. The eventual goal of _this_ box is to pass all tests, then move on to repairing the TD8E/TU56 that came with it. When I used this box in college, it used to work. Between then and when they threw it out, the DECtape stopped working. I have boxes of tapes to go through/use/backup once it all works. -ethan ===== Infinet has been sold. The domain is going away in February. Please send all replies to erd(a)iname.com __________________________________________________ Do You Yahoo!? Bid and sell for free at http://auctions.yahoo.com