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  • AK6DN's Avatar
    Today, 09:32 AM
    You can also look here for PDP-8e MAINDEC binary tapes and corresponding listings and PDF documentation: https://www.ak6dn.com/PDP-8/MAINDEC/ I've...
    7 replies | 60 view(s)
  • AK6DN's Avatar
    August 12th, 2019, 09:31 AM
    The PDP-11 operating systems do NOT use PC partition formatting, so forget about using any tools like PARTED, etc to write an MBR and partition...
    8 replies | 806 view(s)
  • AK6DN's Avatar
    August 11th, 2019, 11:02 AM
    AK6DN replied to a thread How to test M8655 serial board in DEC
    That test program never waits for the character to print before going around the loop again. You need something like this: 0000 7200 CLA / INIT...
    8 replies | 192 view(s)
  • AK6DN's Avatar
    August 9th, 2019, 01:43 PM
    AK6DN replied to a thread RX8E 74xx clone works in DEC
    Yeah 2 layer should probably work just fine. I was just being lazy and wanted to try a cheap 4 layer project, so my $3 vs $6 per board cost was a non...
    7 replies | 307 view(s)
  • AK6DN's Avatar
    August 2nd, 2019, 05:24 PM
    AK6DN replied to a thread PDP-11 disassembler for Windows? in DEC
    As a 'side' benefit of using SIMH it can also run the code you plug into it, if you so choose. Single step, display processor state, etc are also...
    13 replies | 626 view(s)
  • AK6DN's Avatar
    August 1st, 2019, 09:34 PM
    AK6DN replied to a thread PDP-11 disassembler for Windows? in DEC
    Using SIMH:DEC pdp11 PDP-11 simulator V4.0-0 Current git commit id: 0b9cfa9b sim> de 000000 006100 sim> de 000002 006100 sim> de...
    13 replies | 626 view(s)
  • AK6DN's Avatar
    August 1st, 2019, 08:05 PM
    AK6DN replied to a thread PDP-11 disassembler for Windows? in DEC
    With SIMH you can load BIN (binary) format images and then use the disassembler. Or just poke octal values into memory and disassemble.
    13 replies | 626 view(s)
  • AK6DN's Avatar
    August 1st, 2019, 02:33 PM
    AK6DN replied to a thread PDP-11 disassembler for Windows? in DEC
    If you just want to poke a few values into some program as PDP-11 binary code and then display as disassembled code, SIMH can easily do that. You...
    13 replies | 626 view(s)
  • AK6DN's Avatar
    July 24th, 2019, 02:57 PM
    AK6DN replied to a thread Build your own PDP 8I, Part 4.. in DEC
    One of the nice things both DigiKey and Mouser allow now is for you to create a BOM file in text/csv format and upload it to their site. If it...
    211 replies | 17977 view(s)
  • AK6DN's Avatar
    July 24th, 2019, 12:29 PM
    AK6DN replied to a thread Build your own PDP 8I, Part 4.. in DEC
    I tend to use these from Mouser: ...
    211 replies | 17977 view(s)
  • AK6DN's Avatar
    July 22nd, 2019, 02:43 PM
    Back around 2006 or so when I was doing my PDP-8m console debugging and ran into the 74175 issue I went over to Ace Components (sadly now closed, in...
    13 replies | 567 view(s)
  • AK6DN's Avatar
    July 22nd, 2019, 12:33 PM
    No I haven't, since the console on that machine is still working. But as Maurice indicated in the previous post, the 8m console requires 175 parts...
    13 replies | 567 view(s)
  • AK6DN's Avatar
    July 22nd, 2019, 11:47 AM
    The order and placement looks ok. Do you not have a serial console interface? Having the videos of you entering the data and running the...
    13 replies | 567 view(s)
  • AK6DN's Avatar
    July 22nd, 2019, 11:18 AM
    I will post this info I sent out ~13yrs ago when I was debugging console problems on my PDP-8m. Short summary is that the design of the console is...
    13 replies | 567 view(s)
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Recent Entries

RX01/RX02 Drive Emulator using Arduino and a custom shield

by AK6DN on February 4th, 2017 at 09:00 PM
Late in 2015, after retiring from full time work, I dug out my half-finished-never-quite-got-to-work PIC18F4550-based RX02 emulator project from about 10 years ago. It was based on the Dickman RXM code base ported to a USB capable PIC18 device. The intent was to emulate the RX02 device interface with a USB serial backend to a PC running my TU58EM code, kind of like a version of serial disk for the RX interface, with TU58EM as the server. For various reasons I was never able to get a stable USB comm

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Updated August 10th, 2019 at 02:39 PM by AK6DN

Categories
DEC

RX01/RX02 Emulator Passes PDP-11 Diagnostics!

by AK6DN on February 3rd, 2017 at 02:54 PM
So, mega success. I was finally able to get my RX02 emulator passing all three DEC RX02/RX211 diagnostics:

(1) ZXRDC0 : RX02 SS PERF EXER (it has been doing this for a while)
(2) ZRXEA0 : RX02 FMTR PROG (just tonight!)
(3) ZRXFB0 : RX02 FUNCTION-LOGIC TEST (just tonight!)

ZXRF the RX02/RX211 hardware function/logic diagnostic is the big one. Fooling the DEC diagnostic with the RX02 emulator so that this test passes 100% turned out to be a non-trival debugging

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Updated June 2nd, 2019 at 11:33 AM by AK6DN

Categories
DEC

DEC XXDP Image Manipulation - xxdpdir

by AK6DN on February 3rd, 2017 at 02:47 PM
So ... over the past month I was able (finally) to finish and test my version of XXDPDIR (actually xxdpdir.pl plus an XXDP.pm Perl module) that supports access to RX01 and RX02 media images (as well as simple linear block drives like TU58, MSCP, RL02, etc) so I could now build RX01 and RX02 bootable XXDP file systems just like I did for TU58 bootable XXDP filesystems. It is written in plain jane Perl, so I run it under CYGWIN 32b on Win7 64b, but it will run on just about any OS that supports Perl,

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Updated February 4th, 2017 at 07:02 PM by AK6DN

Categories
DEC

PDP-11 (or 8) worthwhile without disk drives?

by AK6DN on February 3rd, 2017 at 02:43 PM
There are several options for both PDP-11 and PDP-8 that don't use legacy spinning magnetic media.

PDP-11 TU58EM TU-58 emulator. Requires a Windows/Linux PC or equivalent to run the emulator server code (see https://github.com/AK6DN/tu58em) and an extra serial port on the PDP-11 as the hardware interface. Capable of running XXDP diagnostic images (useful for debug, not much else) but also large enough for a minimal RT-11 system. Search this forum for TU58EM, should find lots of activity.

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Updated February 4th, 2017 at 07:02 PM by AK6DN

Categories
DEC