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Type: Posts; User: m_thompson

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  1. Replies
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    Make a load board for the other voltages that...

    Make a load board for the other voltages that plugs into a backplane slot?
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    568

    I think that about a 20% load on the voltages...

    I think that about a 20% load on the voltages would be enough to debug the power supply.
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    I would 2) build the dummy load and observe the...

    I would 2) build the dummy load and observe the system under the test conditions some more

    >One capacitor on the memory regulator board read a higher capacitance out of tolerance
    The tolerance on...
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    VAX 11/750 for the RICM

    We picked up a recently donated VAX 11/750 Saturday. The cabinet that contained the RA60 was a mess from mice living in it so we removed the RA60, cables, slides, and left the cabinet. The TU80 had a...
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    The ASR-33 that came with the RICM's Altair has...

    The ASR-33 that came with the RICM's Altair has the reader-run board for external control. It also has a user-added toggle switch to activate the reader if it is connected to a computer that cannot...
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    Especially the PDP12 software...

    Especially the PDP12 software...
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    When I did a CP/M 3 port to a Multibus system a...

    When I did a CP/M 3 port to a Multibus system a few decades ago, the boot EPROM started at address 0 at power on and copied itself to a 4k bank 60k. The EPROM image contained the code to fiddle with...
  8. And you rescued some PDP-9 software paper tapes...

    And you rescued some PDP-9 software paper tapes that we believe are the only existing copies.
  9. 10 that I know of. There was an 11th in a stable...

    10 that I know of. There was an 11th in a stable in Australia that was left behind during a PDP-8 rescue.
  10. You can make an offer...

    You can make an offer...
  11. Charles donated a TC02 to the RICM for the PDP-9...

    Charles donated a TC02 to the RICM for the PDP-9 project. I repaired it and added three TU55 drives, and now the PDP-9 will boot and run the ADSS operating system.

    Charles sent me a copy of the...
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    1,998

    I replaced the DM8097/SN74367 and the second...

    I replaced the DM8097/SN74367 and the second programmer's panel now works OK.

    I am working on the third programmer's panel now, but had to order some more ICs.
    I tested the CPU and core boards...
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    I need the same information for an 8/a that I am...

    I need the same information for an 8/a that I am working on.
  14. I could restart my Omnibus Peripheral Emulator...

    I could restart my Omnibus Peripheral Emulator project. I believe that the FPGA has enough unused I/O to do data-break, so with a little work it could emulate a CPU and then test any I/O board.
    ...
  15. The displayed values are stored in a 4-digit...

    The displayed values are stored in a 4-digit FIFO, so 4x 3-bit values for the data display, 4x 3-bits for the address, 1x 3-bits for the extended address, 1x 4-bits for the LEDs.
    Sounds like a lot...
  16. Connect in parallel to the keypad contacts with...

    Connect in parallel to the keypad contacts with open-collector drivers?
  17. The problem that many people have when bringing...

    The problem that many people have when bringing up a PDP-11 for the first time is that everything is an unknown, and they don't have another PDP-11 to test the boards. Using your console modification...
  18. Could you make a script that uses the serial...

    Could you make a script that uses the serial console of an 11/44 to do the same low level testing that you did by hacking the 11/34 console?
    I imagine that it would be much slower than your 11/34...
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    Only the right one is included in this auction. ...

    Only the right one is included in this auction.

    One in better condition sold today for $6,100.

    These are all from Charles Lasner's estate.
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    Console #2 Has a bad DM8097 E31 on the Register...

    Console #2
    Has a bad DM8097 E31 on the Register Board. This doesn't let the INIT signal get to the backplane.
    I found a tube of 10x NOS DM8097 DM74367 chips on eBay. They should be here this week....
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    I had three different consoles that behaved...

    I had three different consoles that behaved differently using the same M8316 board and cables, so of course the problem wasn't the cables it was the consoles. :(
    Next time I will check the cables...
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    With console #1, swapping the two ribbon cables...

    With console #1, swapping the two ribbon cables with each other yields very different console behavior.

    I hacked up some 40 pin IDE disk ribbons to replace the defective DEC ribbons and it looks...
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    If you don't plug in a keyboard the display...

    If you don't plug in a keyboard the display defaults to the first serial port.
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    The 7475, E26 on the Register board that latches...

    The 7475, E26 on the Register board that latches the function button presses doesn't latch. I should have a replacement next week.
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    I am working on console #3. This one has a 7408,...

    I am working on console #3. This one has a 7408, E10 on the display board with a weak low drive on pin 8. Everything downstream seems to work OK, but I will replace it anyway. It has a bad 74153, E19...
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