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Type: Posts; User: m_thompson

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  1. Replies
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    How about a quad board with a KT8A and 128kw of...

    How about a quad board with a KT8A and 128kw of RAM, and other peripherals.
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    6,470

    Looks like the S107 module in the TC02 inverts...

    Looks like the S107 module in the TC02 inverts two of the device address bits from the processor. One of the inverted bits is inactive, so the next project is to check on the S107. We may have a...
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    Roland, An combination I/O card that included...

    Roland,

    An combination I/O card that included RTC, two serial, Centronics printer port, memory, and bootloader would be really great. It would save a lot of slots, and save a lot of money.
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    We connected up the I/O cables from the PDP-9...

    We connected up the I/O cables from the PDP-9 processor to the TC02 and borrowed the indicator display cables from the TC59 controller. When executing TC02 I/O instructions there is no response from...
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    I could only find Dialight 507-397-1475-600...

    I could only find Dialight 507-397-1475-600 replacements. The originals are flush with the front panel. The replacements stick out about 1/8".
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    The original power supply in the I/O cabinet for...

    The original power supply in the I/O cabinet for the TC59 Magnetic Tape controller didn't have enough power to also feed the TC02 DECtape controller. We added another +10V/-15V power supply just for...
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    As a separate project we should determine why the...

    As a separate project we should determine why the blower motors are going bad. I have three of them where the internal connection between the start coil (black), run coil (blue) and green wire has...
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    Yes, it would be interesting to see how yours is...

    Yes, it would be interesting to see how yours is wired.
  9. Replies
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    Yesterday we wired the DC power to the TC02...

    Yesterday we wired the DC power to the TC02 DECtape controller (thanks Charles Lasner) and the two TU55 DECtape drives that we recently installed in the PDP-9 I/O cabinet. We were not sure that the...
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    it is an interprocessor buffer to interconnect...

    it is an interprocessor buffer to interconnect two PDP-8 systems, or maybe your PDP-9 and a PDP-8.

    You need to find the 08-H8PA-D PDP-8 DB08 Interprocessor Data Buffer Maintenance Manual
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    Charles modified the handler so it would run on...

    Charles modified the handler so it would run on the RICM PDP-12, so it should run on your 8/I.

    I believe that Kyle has a copy of the modifications. If not, I can send him the modified source.
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    I have an early revision EAE board set that I...

    I have an early revision EAE board set that I need to modify to work in my newer 8/e, so I could also use a more readable set of prints.
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    I can do that!

    I can do that!
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    The PDP-9 that I am working on has lots of 6-pin...

    The PDP-9 that I am working on has lots of 6-pin rectifier modules. They contain 4x diodes with 4x pins for the diodes, and 2x pins for a common anode & cathode connection for pairs of diodes.
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    Sometimes the maintenance manuals are difficult...

    Sometimes the maintenance manuals are difficult to understand...

    Last week we when working on the PDP-9, we followed the System Adjustment Procedure and adjusted the Margin Voltage to the core...
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    I have an RK05 blower motor with an open winding.

    I have an RK05 blower motor with an open winding.
  17. I didn't keep any of the 4JS2 source tapes or...

    I didn't keep any of the 4JS2 source tapes or manuals. We ran a DPS8/70. Nice machine. Wish I kept pictures of the datacenter.
  18. The Rhode Island Computer Museum has one of those...

    The Rhode Island Computer Museum has one of those really wide consoles in the previous post on their B800.
    http://www.ricomputermuseum.org/Home/equipment/burroughs-b800

    53534
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    Stanford found that 80% of the failures in their...

    Stanford found that 80% of the failures in their PDP-9 were in the Control Memory. They made a replacement for the G920 module using toroids that proved to be much more reliable.
    ...
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    Very simple test. On the G920 there are 64...

    Very simple test. On the G920 there are 64 current steering diodes on each end of the FlipChip. The drivers connect one end to ground and the other end to -15V. There are some pull-ups and a small...
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    We finally found the problem with the PDP-9. One...

    We finally found the problem with the PDP-9. One of the diodes on the G920 Control Memory board had a voltage drop of 1.1V where it should have been about 0.65V. This caused the current flowing...
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    Well, the PDP-9 at the RICM is not running again....

    Well, the PDP-9 at the RICM is not running again. We had a problem where the JMP instruction would not work, but everything else did. We traced it to the PCI (Program Counter In) microcode bit not...
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    Try...

    Try https://mailman.qth.net/mailman/listinfo/greenkeys
  24. DEC commonly added a small circuit board holding...

    DEC commonly added a small circuit board holding a relay to the ASR33 so they could remotely control the reader. There was an additional 20mA circuit from the computer's serial port that would turn...
  25. Charles Lasner modified the serialdisk handler so...

    Charles Lasner modified the serialdisk handler so it doesn't use the BSW instruction. We also run it on the PDP-12.
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