Image Map Image Map

Search:

Type: Posts; User: Hugo Holden

Page 1 of 20 1 2 3 4

Search: Search took 0.07 seconds.

  1. Replies
    27
    Views
    519

    It is interesting the hypothetical notion about...

    It is interesting the hypothetical notion about what would have happened if some major person, company, product, band etc never came into existence, what would have been the outcome. They did this...
  2. Yes , exactly as I mentioned in post #20, the...

    Yes , exactly as I mentioned in post #20, the reason I know is that I have done this myself many times and gashed my hands on sharp objects after a shock.

    Though I had two near electrocution...
  3. I'm still with you and as noted in my post above...

    I'm still with you and as noted in my post above I'm 100% confident I would not be harmed by a shock from the stored energy in a CRT bulb as the energy is about 1/50th of a Farmer's electric fence...
  4. Well I wasn't suggesting touching the final anode...

    Well I wasn't suggesting touching the final anode connection with the CRT and the EHT generator running, that is a completely different matter and very dangerous, I was referring to the stored charge...
  5. For God's sake, when I read threads like this it...

    For God's sake, when I read threads like this it makes me wonder (as Sigourney Weaver said on one of the Alien movies) if IQ's had dropped sharply while she was away.

    There is no significant...
  6. That is an interesting glitch as a result of some...

    That is an interesting glitch as a result of some timing anomaly, probably the designers knew about the defect and just decided to leave it as mostly it would be hiding inside the H blanking time and...
  7. It does sound as though there may be a failed...

    It does sound as though there may be a failed component in your supply. Repairing these is not without it hazards.

    A while back I wrote a detailed article on the IBM 5155 computer supply, similar...
  8. Replies
    13
    Views
    490

    somehow got a double post so ignore this one

    somehow got a double post so ignore this one
  9. Replies
    13
    Views
    490

    Thanks Wayne. PS: I thought it would we worth...

    Thanks Wayne.

    PS: I thought it would we worth mentioning that if any vintage pcb's are reproduced, that it should be a not for profit enterprise. For my part I'm interested in the old technology,...
  10. Replies
    3
    Views
    193

    As noted by Modem7 this is a vertical scan...

    As noted by Modem7 this is a vertical scan amplitude & linearity problem.

    From first principles. the scanning current should be in increasing in a sawtooth linear manner, from top to the bottom of...
  11. Replies
    4
    Views
    398

    I have been loading some programs into the ROM...

    I have been loading some programs into the ROM space and having some interesting experiences.

    I got the MEMTEST program and used the front end of it which loads the entered address range into the...
  12. Replies
    4
    Views
    194

    I can help you with this question. I have...

    I can help you with this question.

    I have restored many items made of aluminium. For example it was interesting that in the UK, most of the chassis assemblies on vintage TV's tended to be...
  13. Replies
    13
    Views
    490

    Hi, That is good. Do you have the diagram of...

    Hi, That is good.

    Do you have the diagram of the bottom (solder side) of the other of the two pcb's ?
  14. Replies
    13
    Views
    490

    It would be wonderful if these could be found. ...

    It would be wonderful if these could be found.

    My interest would be to make an exact replica board set to the original, which could be done with the schematics and foil design and if anyone else...
  15. That was a good idea to make that external box. ...

    That was a good idea to make that external box.

    Was your music system the one on a blue Solid Sate Music S-100 card for music, or was it the R-C coupling a pulse from one of the S-100 connectors...
  16. Replies
    59
    Views
    5,631

    Actually it is not the composite video signal...

    Actually it is not the composite video signal itself that has the problem. It is the video bandwidth capability and focused spot size and focus of the monitor. Unless say there was loss of HF...
  17. Replies
    82
    Views
    4,081

    yes, it can be a risky business shipping CRT's....

    yes, it can be a risky business shipping CRT's. They always need double boxing and then some luck too.
  18. Replies
    82
    Views
    4,081

    Conversion adapters can be a little finicky about...

    Conversion adapters can be a little finicky about the exact timing and pulse widths. A CGA monitor itself would not be. One thing is if you could get your hands on a real CGA monitor to test your...
  19. Replies
    82
    Views
    4,081

    One thing, using the LS244 to drive a cable,...

    One thing, using the LS244 to drive a cable, rather than putting the small capacitors on the outputs of the '244 like IBM did, a series 15R resistor is a good idea. It doesn't affect the ability to...
  20. Replies
    0
    Views
    115

    Increasing H scan rates in VDU's.

    I thought I would post this information here as it might help people dealing with PET's and attempting to run other VDU's than the PET came with. I don't have a PET myself (My vintage computers are...
  21. Replies
    82
    Views
    4,081

    Yes that looks good. Hugo.

    Yes that looks good.

    Hugo.
  22. The IBM ISA XT Printer adapter card is actually...

    The IBM ISA XT Printer adapter card is actually an 8 bit bidirectional port, though they didn't hardware configure it that way , but they designed it so it can work. If you change a link on this pcb,...
  23. Replies
    82
    Views
    4,081

    That it useful and it saves having to add gates...

    That it useful and it saves having to add gates to invert.

    Though there is another reason to add gates in this case. When driving a monitor, CGA, or composite (though these remarks are more...
  24. Replies
    44
    Views
    1,784

    Ha Ha, that is very funny, I had not heard this...

    Ha Ha, that is very funny, I had not heard this joke in Australia before, it must be unique to the USA. Though of course we see a lot of imported parts with the UL logo on them... still laughing !
    ...
  25. Its possible to test transistors in circuit too,...

    Its possible to test transistors in circuit too, the tests are less reliable, but sometimes they will identify a shorted or open junction. Not so good for testing leakage due to parallel resistances...
Results 1 to 25 of 500
Page 1 of 20 1 2 3 4