Short PDP-8 Memory Test...

[Lyle Bickley]

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 <bitwiz at 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"