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  1. Very nice!

    Very nice!
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    When we disassembled the VR14 on the PDP-12 the...

    When we disassembled the VR14 on the PDP-12 the front glass was only attached over about 10% of the surface so we could easily remove it.
  3. The RICM has a TU60 with melted rollers. Please...

    The RICM has a TU60 with melted rollers. Please post your results with getting the rollers replaced.
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    Thanks very much for scanning and posting the...

    Thanks very much for scanning and posting the documentation.
    The RICM has permission from ECRM to distribute the scanner documentation and software.
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    I have been working on a Windows GUI program that...

    I have been working on a Windows GUI program that can read OS/8, ADSS, and LAPS/DIAL SIMH disk and DECtape images. It is far from finished, but getting better and useful.
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    The MAINDECs for the TD8E are very comprehensive...

    The MAINDECs for the TD8E are very comprehensive and complicated so I made some very simple tests for the TD8E.
    One will copy the console switches to the Command Register. This will let you move the...
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    I spent some time today chasing an issue with the...

    I spent some time today chasing an issue with the TC02 DECtape controller where it would interrupt when it shouldn't, and not interrupt when it should. After an hour of chasing signals around the...
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    Today was a holiday in RI, so I had some more...

    Today was a holiday in RI, so I had some more time to work on the PDP-9.

    I ran MAINDEC-9A D3BB-PB TC02 Basic Exerciser test #11, TC02 Instruction Test to see if the issues we had with the Status...
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    We have so much equipment that needs to be...

    We have so much equipment that needs to be restored and made demonstrable...
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    He is going to URI for grad school, so just a 15...

    He is going to URI for grad school, so just a 15 minute drive away.
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    Jack, The PDP-9 helpers are two existing...

    Jack,

    The PDP-9 helpers are two existing volunteers, and one new young volunteer. Dawson should move here in a few weeks, so can hopefully volunteer him to help keep the PDP-12 and the PDP-8/I...
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    We had a very successful day working on the DEC...

    We had a very successful day working on the DEC PDP-9 and TC02 DECtape controller.

    Alex found and replaced a bad diode on the B310 delay line FlipChip that prevented the core memory from working a...
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    Very nice! Omnibus boards are going for very high...

    Very nice! Omnibus boards are going for very high prices on eBay lately.
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    I made a similar Omnibus board and put a combo...

    I made a similar Omnibus board and put a combo FPGA-ARM3 on it. It could emulate any peripheral that didn't need DMA.
    ...
  15. The datacenter that I worked in decades ago used...

    The datacenter that I worked in decades ago used 716s as a front-end processors for their Honeywell Level-66 mainframe.
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    Happens all the time with these ancient machines.

    Happens all the time with these ancient machines.
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    The memory is working again. The B310 delay line...

    The memory is working again. The B310 delay line that takes CLK and makes POST CLK\ had a non-monotonic output so the pulse amplifier that takes POST CLK\ and makes POST CLK was double triggering and...
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    Yesterday we ran MAINDEC-9A D3BB-PB TC02 Basic...

    Yesterday we ran MAINDEC-9A D3BB-PB TC02 Basic Exerciser test #0. This moves the DECtape forward until the TC02 controller finds the End Zone, then moves the tape backwards until the End Zone, and...
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    We loaded the paper tape for MAINDEC-9A D3BB-PB...

    We loaded the paper tape for MAINDEC-9A D3BB-PB TC02 Basic Exerciser that Mattis Lind punched and sent us. We ran test #0, Basic Motion. This test puts the tape in Forward Motion and watches for the...
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    I tried the MAINDEC-9A D3BB-PB TC02 Basic...

    I tried the MAINDEC-9A D3BB-PB TC02 Basic Exerciser, and it read in OK. I haven't tried the other tapes yet, because the TC02 Basic Exerciser revealed more broken things in the TC02 DECtape...
  21. There is a list of paper tapes that we know about...

    There is a list of paper tapes that we know about here: http://www.ricomputermuseum.org/Home/equipment/dec-pdp-9
    Like Mattis and Anders, I am very interested in any of the paper tapes that you have....
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    Yay, We replace a transistor on an inverter...

    Yay, We replace a transistor on an inverter FlipChip an now the DECtapes move when we send a MOVE command to the TC02 DECtape controller. The indicator lights on the TC02 display panel flicker when...
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    Today, after lots of false leads, we found that...

    Today, after lots of false leads, we found that the signal from the processor that tells the TU55 DECtape drives to stop moving when the processor halts is always in the halt mode. No wonder the...
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    That is the CPU that I have. The Dataram board...

    That is the CPU that I have.

    The Dataram board has 4x columns of 18 RAM chips. The RAM chips are Micron 1259-12, so that makes it 1MW with parity for a total of 1280KW.
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    You can find the manuals for the 8/e here:...

    You can find the manuals for the 8/e here: http://www.bitsavers.org/pdf/dec/pdp8/pdp8e/

    You can start by removing all of the boards and testing the power supply. If it doesn't regulate correctly...
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