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Thread: Dec RK8E controller for RK05 wanted

  1. #41


    Quote Originally Posted by m_thompson View Post
    After you clean the heads, you can manually load them to make sure that nothing bad happens.
    That head cleaning is absolutely necessary But the amount of dust around the
    heads is also shocking... Dust stick to the wires, on top of the head assembly etc...


    Quote Originally Posted by m_thompson View Post
    The maintenance manual shows some jumpers that you can install to perform some seek tests.
    Okay thanks for the info. I have to look into that manual for that.

    Quote Originally Posted by m_thompson View Post
    The FLIR images are very cool.
    Yeah I thought also
    WTB: RX8E / M8357 and Case for Altair 8800

  2. #42


    I found RK8E testsoftware ( ) on an RK05 image which I use with Kyles disk server.
    Are these different from the papertape versions? Or are they at least documented?

    And I wonder, the RK05 image is modified to work with the disk server.
    Would it still be possible to run that RK8E test then?
    WTB: RX8E / M8357 and Case for Altair 8800

  3. #43


    I guess a bit, but the MAINDEC's doesn't use OS/8 for testing, so it should be fine to run them.

  4. #44


    In the meanwhile Jack Rubin did help me a lot to get GTTY running again on a modern PC.
    And Lou helped me a lot with his H803 which I turned into H851s

    So my Plessey RK8E clone now has brand new H851 blocks on it:
    08 H803 to H851.jpg

    Time to test...

    Quote Originally Posted by anders_bzn View Post
    I guess a bit, but the MAINDEC's doesn't use OS/8 for testing, so it should be fine to run them.
    Well I've tried to test the Plessey controller which was bought incomplete. So it was in unknown state.
    I ran on the service image within OS8. And immediately I got:

    PC:0243 GD:2200 ST:2202
    DHRKAE FAILED PC:6726 AC:0000 MQ:7777 FL:0001
    If I pulled out the controller I got a slightly different message.
    So it seems to detect the board but it quits almost immediately as well.

    To be sure I wanted to toggle in the rimloader, load the binloader and run the
    test from a papertape image which I downloaded from Vince his website.

    After toggeling in the RIM loader somehow I made an error myself and gave
    the start address of 7777 instead of the 7756. Suddenly text like this showed up.
    DHRKAE PASS 0202
    DHRKAE PASS 0203
    DHRKAE PASS 0204
    Now that is weird! I haven't loaded any papertape image yet. This was still in core.
    Within a few seconds this message showed up in the disk server:
    Warning: client asking to overwrite system handler!
    Failed to initialize, sending NACK
    Probably the code ran into a part of OS8 in core, no idea what happend...

    Next try went better... Rim loader, bin loader and loaded dhrka-e.bin
    After starting the test the system ran for about four minutes and then:
    WooHoo! So don't run tests within OS8 disk server... This might fail...

    01 Testing in PDP8e.jpg 02 woops.jpg 03 another woops.jpg 04 RK8E DISKLESS PASS COMPLETE.jpg

    The postman from China is letting me down a bit. I'm waiting for three weeks now on the M993 PCB's.
    At this point I can't get any further... I hope the boards are coming soon...
    WTB: RX8E / M8357 and Case for Altair 8800

  5. #45


    Mine was a lot more difficult to get running. One of the delay lines that was added by DEC as an ECO was ripped off the PCB. Vince gave me a flipchip so that I could remove a delay line and replace mine. With a few broken chips replaced, it is now working OK.
    Member of the Rhode Island Computer Museum

  6. #46


    Well done!

  7. #47


    Does anyone have one or more (even crashed) 16 sector RK05 disk packs for sale?
    This would be a great help to me.

    I have only one 16 sector pack and I don't want to run the disk tests on it because
    the disk would be wiped after that. And I would like to preserve the data of course.

    Thanks in advance!
    WTB: RX8E / M8357 and Case for Altair 8800

  8. #48


    Finally, the M993 boards (which I call the M993D) arrived Wednesday
    together with the bootloader PCB's. The Bootloader took only
    about 5 days and the M993D took about 5 weeks... Niels (lives in China)
    put them in his suitcase when he went to Belgium to ship it from there.
    But he forgot to ship it and it took more time instead of less time...
    I can't blame him, the intentions were good

    I've put on the few components. One of the two empty resistor places is
    to omit the TTL and transistor circuit which is seen on some M993 boards.
    The other is to select a different pin which I mentioned earlier in this topic.

    12 M993D.jpg

    When I want to put it in the RK05 it just would not fit. It was too tight...
    I've got an nice H803 from Lou so I could see where it goes wrong.
    I had to use a file to just get a very very little bit off of the connector edges.
    And I made a V shape at the bottom of the PCB as well. Now it fit's nicely into the H803

    13 M993D fits.jpg

    I wired it all up. Figuring out how it was meant to be connected. Hope I'm right

    M993D cables.jpg

    And finally wired the RK05. So it's ready for the next tests...
    I want to get the bootloader project done first because there is only a bit
    software to do. And the bootloader can be a great help to service the RK05.

    M993D in RK05.jpg

    Regards, Roland
    WTB: RX8E / M8357 and Case for Altair 8800


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