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Type: Posts; User: Gary C

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  1. Certainly my ii+ psu was fine when I got it, then...

    Certainly my ii+ psu was fine when I got it, then occasionally flaked out, then got worse. If a joint is cracking, thermal cycling makes it worse, then an oxide layer builds up.

    Also, there was no...
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    HR Deimen have schematics for their replacement...

    HR Deimen have schematics for their replacement parts but they dont seem to have an equivalent for yours.
  3. While it was an Apple II psu, I had a very...

    While it was an Apple II psu, I had a very similar problem which was due to a cracked solder joint on the big power transistor and it would refuse to start. Might be worth a quick trip around the...
  4. Thread: Thing the herd

    by Gary C
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    I suppose its a bit like the classic car market ...

    I suppose its a bit like the classic car market

    I have a 32 year old Porsche and its value is almost impossible to determine without actually selling it. Its only worth what someone is prepared to...
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    I bought a few keycaps and stalks in 2018 but...

    I bought a few keycaps and stalks in 2018 but they dont really seem to be available,

    You might be better off with this
    ...
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    Thinking about the lack of screen burn, maybe...

    Thinking about the lack of screen burn, maybe this tube has some life. I can't be sure what part of the system this screen was used for but worth having another look.

    Putting the scope on the...
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    Well, mine is working but its a bit dim. The...

    Well, mine is working but its a bit dim.

    The heater voltage is spot on at 12V, the Screen and Brightness supplies to grids G1 & G2 are fine and at max you can see the raster,. The contrast circuit...
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    Taken the flyback out of the replacement board...

    Taken the flyback out of the replacement board and put it in the original and the display is now filling the screen. The brightness is only just ok even with every external and internal pot wound up...
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    Circuit diagram for the 420 is not available on...

    Circuit diagram for the 420 is not available on line (i've looked)

    I am trying to get mine working, but its very dim and all squashed up. Need a HV probe for my Fluke to see if the flyback is...
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    Reminds me of the terminal I used to use with a...

    Reminds me of the terminal I used to use with a Gamma Spectrometer in the late 80's

    It had a graphics overlay to display the collected energy spectrum. You selected it then it could be pulled down...
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    Hum, no idea ?

    Hum, no idea ?
  12. Thread: TI 99/4a

    by Gary C
    Replies
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    I always wanted one back when, because hey they...

    I always wanted one back when, because hey they were shiny !

    As I remember, the TMS9900 is the processor in each card of the Reypack 99E PLC and we have hundreds of those at work, very reliable.
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    Managed to find an RL26L-E with VMS 6.1 on it :)

    Managed to find an RL26L-E with VMS 6.1 on it :)
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    Are these what you are looking for ? (nothing...

    Are these what you are looking for ?

    (nothing to do with me, I must add)

    CPU Board...
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    SCSI2SD does sound good. Like a Gotek on steroids...

    SCSI2SD does sound good. Like a Gotek on steroids (and priced to match), though looking at 50 pin drives, the choice is very low and generally even more expensive.

    Then again, I do have one...
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    One question Can any 50 pin SCSI drive be used...

    One question

    Can any 50 pin SCSI drive be used to replace the RZ26L-E or did DEC use specific ID's for supported drives ?

    I believe its a SCSI-I 8 bit parallel interface ?
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    Remote boot from the VLC ?, interesting, might...

    Remote boot from the VLC ?, interesting, might try that just for fun.

    Getting a bit thick on VAX's in my garage. Thats two 3100's, a 3300 a 4000/96 and a 4000 VLC.

    Time for a cluster !
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    Thanks, my experience level is 'complex' to...

    Thanks, my experience level is 'complex' to describe. Got involved peripherally at work in the 90's with our system that ran as a data logger to the system I was really responsible for, so have...
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    VAXstation 4000 model 96

    Right

    Now its time to work on the 4000 but running into some unusual problems

    Sometimes the PSU wont start. I imagine the system uses some sort of interlock between boards ? Have removed...
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    Definitely IGH and a duck head. I was bought...

    Definitely IGH and a duck head.

    I was bought from a house near Bradford too.
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    Ah, as you were. Found the console port ! ...

    Ah, as you were. Found the console port !

    Working with the VT525 now.
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    Actually, managed to get Authorize to run (poor...

    Actually, managed to get Authorize to run (poor typing !)

    Next issue is EDIT wont run as I am logged in via the CRT rather than a serial console and the startup procedure is waiting for a server...
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    Conversational boot

    Sorry, been through this before but

    After a conversational boot (B/R5:1) then a spawn to create a process, whats the command to stop it logging out if I get an error ?

    I'm trying to run...
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    Yep, did an Amstrad last month, what a bad choice...

    Yep, did an Amstrad last month, what a bad choice of materials. It also looks as if the drive can easily be connected to a PC (and a Gotek therefore). Got a 13 Gotek on the way which was destined...
  25. Nice, never heard that one.

    Nice, never heard that one.
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