Image Map Image Map

Search:

Type: Posts; User: m_thompson

Page 1 of 20 1 2 3 4

Search: Search took 1.00 seconds.

  1. Replies
    1
    Views
    107

    At first power up I always reform all of the...

    At first power up I always reform all of the capacitors, even they electrolytics on the flipchips.
  2. Replies
    33
    Views
    884

    I gave my Alphas away because they seemed too...

    I gave my Alphas away because they seemed too modern compared to my PDP-8 or PDP-11 systems.

    The RICM has one Alpha machine that would be fun to get running. It is a CRAY T3E-900 that has 36x 450...
  3. Seeks are really noisy. What model disk?

    Seeks are really noisy. What model disk?
  4. Replies
    29
    Views
    1,278

    It would be helpful if you removed the top front...

    It would be helpful if you removed the top front cover and took a picture of the boards that are installed. Just four screws and the top cover lifts off. No need to remove the boards. The boards...
  5. Replies
    29
    Views
    1,278

    The 11/24 is a nice little Unibus system and...

    The 11/24 is a nice little Unibus system and should have some value to a PDP-11 enthusiast. Pictures of the system and the boards inside would help. We can help you identify the boards in the...
  6. Me too.

    Me too.
  7. Did you check the Mark Track Timing Generator for...

    Did you check the Mark Track Timing Generator for correct timing? Mine was off a little and caused problems when formatting tapes.
  8. My TD8E and TU56 were painful to get working....

    My TD8E and TU56 were painful to get working. Mostly because the TD8E was scrapped by DEC and had never worked.

    I have found some DECtapes that format fine in PDP-8 format, but get various Phase...
  9. Replies
    8
    Views
    467

    Mike Douglas made 35 track and 77 track CP/M 2.2...

    Mike Douglas made 35 track and 77 track CP/M 2.2 diskette images for use with an Altair with a 2SIO and a Micropolis floppy controller and diskette drive.

    CONFIG Version 3.9
    (C) 1980 Lifeboat...
  10. Replies
    5
    Views
    285

    Looks like a nice configuration. I just fixed two...

    Looks like a nice configuration. I just fixed two 8/a front panels and need to fix a third. The RK8/E and the RK05 can be challenging to get working, but are very reliable once they are working.
  11. Replies
    17
    Views
    944

    That power supply is used in many DEC chassis. We...

    That power supply is used in many DEC chassis. We spent a lot of time learning about and repairing one in a DW8-E chassis in a PDP-12. We had to Spice simulate the supply so we could understand how...
  12. We were not getting any sector pulses from the 77...

    We were not getting any sector pulses from the 77 track Micropolis drive. The 7414 inverter probably has a leaky input and is pulling the input signal from the sector phototransistor just a little...
  13. Replies
    8
    Views
    467

    With a lot of help from Mike Douglas, the Rhode...

    With a lot of help from Mike Douglas, the Rhode Island Computer Museum got the 77 track Micropolis floppy diskette drive on the Altair 8800 working today. Now we can boot MDOS and run the editor,...
  14. Replies
    8
    Views
    467

    I am going to take the 77 track drive apart...

    I am going to take the 77 track drive apart tomorrow. Hopefully it has some oxide stuck to the head or needs some simple fix.

    If I can't fix the 77 track drive a 35 track diskette image would be...
  15. Replies
    8
    Views
    467

    Thanks! The double-density drive isn't working. I...

    Thanks! The double-density drive isn't working. I copied a double-density diskette image onto the single-density drive and it actually booted MDOS and will run BASIC.
  16. I googled "smoke signal broadcasting" "vdb" and...

    I googled "smoke signal broadcasting" "vdb" and found quite a bit of information.

    The Smoke Signal Broadcasting VDB-1 Video Display Board provides the user with a convenient means of displaying...
  17. If they fit any of these:...

    If they fit any of these:
    https://www.ricomputermuseum.org/collections-gallery/equipment/mai-basic-four-model-1200...
  18. Replies
    8
    Views
    467

    Micropolis Floppy Drive and Controller

    Does anyone have a copy of the single-density or double-density MDOS diskette for an Altair with a 2SIO?
    How about CP/M for a Micropolis floppy diskette controller?
  19. We made some good progress on the Altair today....

    We made some good progress on the Altair today. The double-density Micropolis diskette drive would not write an MDOS diskette using the PC2FLOP program from Mike Douglas and his MDOS image. We tried...
  20. Replies
    76
    Views
    4,824

    Making a modern 128k memory board based on...

    Making a modern 128k memory board based on Vincent's current 32k design would be pretty easy. Finding the KT8-a memory management board for 128k will be challenging.
  21. Replies
    76
    Views
    4,824

    We could make one, and add some other things like...

    We could make one, and add some other things like serial ports.
  22. Replies
    76
    Views
    4,824

    Roland, I had similar problems with device...

    Roland, I had similar problems with device locations for my 8/e. I have a DECtape rack at the top, then the TU56, the RX02, PDP-8/e, and last is the RK05. The power controller interferes with the...
  23. We replaced two SN74367 bus receiver/driver chips...

    We replaced two SN74367 bus receiver/driver chips on the 2SIO board and both serial ports are now working OK. We jumpered the first serial port for 2400 baud. We will try 9600 baud next week.

    The...
  24. Good idea.

    Good idea.
  25. The Rhode Island Computer Museum is very...

    The Rhode Island Computer Museum is very interested in the PDP-5. It would fit in nicely with the rest of our DEC collection.

    It looked like some of the paper tapes were for a PDP-7. That software...
Results 1 to 25 of 500
Page 1 of 20 1 2 3 4