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  1. Replies
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    No the paper tape reader is a parallel interface,...

    No the paper tape reader is a parallel interface, but from the point of view of the programmer/boot loader the programming interface of the console serial port / low speed tape reader (KL8E) and the...
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    That is 100% accurate. For reference, I have...

    That is 100% accurate.

    For reference, I have my PDP-8 diagnostics here: https://www.ak6dn.com/PDP-8/MAINDEC/ with BIN, RIM, LST, PAL, and PDF files for each diagnostic.

    Normally I will use...
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    Found this in the CV of someone on the net: ...

    Found this in the CV of someone on the net:

    April 1978
    Digital Equipment Corp., Albuquerque, New Mexico, c/o Tom Stockebrand.
    Advised on the use of grey-scale and...
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    Here's a blurb on Tom, copied from here:...

    Here's a blurb on Tom, copied from here: http://www.decconnection.org/digitalstechnology.htm

    One of my all-time favorite technologists arrived as a result of this... an amazing guy named
    Tom...
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    Back in 1978 or so when the PDP-11/60 first came...

    Back in 1978 or so when the PDP-11/60 first came out it offered something new for the PDP-11
    series, a writable RAM-based microprogrammable option, and there were some tools developed to
    write and...
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    Too bad it is written in Visual Studio, tho. That...

    Too bad it is written in Visual Studio, tho. That limits to running directly on Windows, correct?
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    You can also look here for PDP-8e MAINDEC binary...

    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 collected PDP-8e core diagnostics (CPU, MEMORY,...
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    The PDP-11 operating systems do NOT use PC...

    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 format. PDP-11 predated PC operating systems, and uses...
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    That test program never waits for the character...

    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 CHAR
    0001 6046 L1, TLS / PRINT CHAR...
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    Yeah 2 layer should probably work just fine. I...

    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 issue for me.
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    As a 'side' benefit of using SIMH it can also run...

    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 available.
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    Using SIMH: DEC[503] pdp11 PDP-11 simulator...

    Using SIMH:
    DEC[503] pdp11

    PDP-11 simulator V4.0-0 Current git commit id: 0b9cfa9b

    sim> de 000000 006100
    sim> de 000002 006100
    sim> de 000004 006100
    sim> de 000006 004567
    sim> de...
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    With SIMH you can load BIN (binary) format images...

    With SIMH you can load BIN (binary) format images and then use the disassembler. Or just poke octal values into memory and disassemble.
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    If you just want to poke a few values into some...

    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 can get prebuilt binaries from SIMH on github; here...
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    One of the nice things both DigiKey and Mouser...

    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 follows their basic formats (very configurable) you can...
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    I tend to use these from Mouser: ...

    I tend to use these from Mouser: https://www.mouser.com/ProductDetail/Vishay-BC-Components/K104K15X7RF53H5?qs=sGAEpiMZZMt3KoXD5rJ2N6ZV8M58kCCv3HG9VpeXcfU%3D

    $0.044 each in 100s.
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    Back around 2006 or so when I was doing my PDP-8m...

    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 2016) in San Jose and bought samples of every...
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    No I haven't, since the console on that machine...

    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 with unbuffered outputs, so you get access to the...
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    The order and placement looks ok. Do you not have...

    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 programs does not help very much, unfortunately. You...
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    I will post this info I sent out ~13yrs ago when...

    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 'interesting' and relies on an undocumented feature...
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    Search this forum for "Rod (Panelman) Smallwood"...

    Search this forum for "Rod (Panelman) Smallwood" (or posts by user PanelMan) ... maker of 100% accurate PDP-8efm plex panels. Not the logic board, just a replacement plex panel.

    Did not do PDP-8I...
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    I have these two. Don't remember where I got...

    I have these two. Don't remember where I got them.

    MAINDEC-8E-D8AC-D-D.pdf
    MAINDEC-8E-D8AC-D-PB.bin
  23. Thread: UC17 question

    by AK6DN
    Replies
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    1,615

    One thing I have found with RSTS is it is...

    One thing I have found with RSTS is it is sensitive to the total physical size of the disk it resides on, in terms of file system.
    If you setup a, for example, 1G SIMH disk image and init that with...
  24. Thread: UC17 question

    by AK6DN
    Replies
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    1,615

    This is a really old version: PDP-11 simulator...

    This is a really old version: PDP-11 simulator V3.9-0

    Go to here: https://github.com/simh/simh to get the latest
  25. Thread: Atex PDP-11/34

    by AK6DN
    Replies
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    Measured with respect to what reference? System...

    Measured with respect to what reference? System GND? If you measure from -15V (on meter v-) to +15V (on meter v+) yes that would read +30V difference.

    OTOH if -15V to GND reads -30V and +15V to...
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