Hi Mike, I consider myself fortunate. I have a PDP-8/E, PDP-8/E with a PDP-8/M Front Panel and a PDP-8/M. My PDP-8/E has an RK05 HDD, RX02 dual FDD and VC8E XY with HP1311 XY Display, Extended Math, 32KW core, etc.
I used to have a huge running PDP-12 with Dual TU56, TC08 w/TU55, Dual disk RF08, 9-Trk tape, PTR/PTP which I donated to the CHM. It'll probably never see the light of day :( Best, Lyle -- On Wed, 6 Apr 2022 20:31:41 -0500 Mike Katz <bit...@12bitsbest.com> wrote: > Another PDP-8E????? You are very lucky :) > > On 4/6/2022 1:06 PM, Lyle Bickley via cctalk wrote: > > I recently acquired another PDP-8/E and wanted to test basic CPU functions > > and memory before I added peripherals. There are some available short > > "memory tests" online, but most don't have have the flexibility to test > > multiple data patterns by design. > > > > The test below does a classic checkerboard type test - and permits easy > > modification of the data pattern used in testing. > > --- > > # Easy to enter, short memory test for PDP-8 systems > > # prior to adding peripheral equipment. > > # by Lyle Bickley > > # > > # Location 21 initially contains a zero. Therefore the > > # memory test is 0000 and 7777 in alternate locations. > > # Changing this location to 7070 will test 7070 and > > # 0707 in alternate locations. Changing it to 5252 will > > # test 5252 and 2525, etc. > > > > 0000 7300 CLA CLL > > 0001 1022 TAD 22 > > 0002 3023 DCA 23 > > 0003 7300 CLA CLL > > 0004 1021 TAD 21 > > 0005 7040 CMA > > 0006 3021 DCA 21 > > 0007 1021 TAD 21 > > 0010 3423 DCA I 23 > > 0011 1021 TAD 21 > > 0012 7041 CMA IAC > > 0013 1423 TAD I 23 > > 0014 7440 SZA > > 0015 7402 HLT (ERROR - AC SHOWS FAIL) > > 0016 2023 ISZ 23 > > 0017 5003 JMP 3 (INC LOCATION AND LOOP) > > 0020 5000 JMP 0 (START OVER) > > 0021 0000 (0=ALT 7777 AND 0000) > > 0022 0025 (LOCATION TO START TEST - MAKE ODD) > > 0023 0000 (LOCATION BEING TESTED) > > --- > > > > Cheers, > > Lyle > -- 73 NM6Y Bickley Consulting West https://bickleywest.com "Black holes are where God is dividing by zero"