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Type: Posts; User: retrogear

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  1. Replies
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    that's a nice scope and more features then I've...

    that's a nice scope and more features then I've ever used. I'm looking at the manual. It's a dual trace scope so you will need 2 probes to do what I'm suggesting.
    You would select Edge Triggering,...
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    We'll see how far we get with this. Can you get...

    We'll see how far we get with this. Can you get access to connector CN10 on the GGS board while it's running? Pin 18 has the horizontal sync pulse, positive going. See if you can get your scope to...
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    since you have a scope, even better if it's a...

    since you have a scope, even better if it's a dual trace or external sync input to the scope, you need to sync the scope to the video output at the horizontal sync rate and see where the 2nd delayed...
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    The problem isn't at the video ram, it's after...

    The problem isn't at the video ram, it's after when it's being converted to analog video stream. I would look at the chips on the Q10 GMS board and see if one is described as a shift register. The...
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    look in here...

    look in here
    http://electrickery.xs4all.nl/comp/qx10/doc/tm1_6-7.pdf
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    661

    Do you have a scope? You'd have to confirm the...

    Do you have a scope? You'd have to confirm the signals coming out of the cable. It might need horizontal sync from the pc to actually produce the green raster. Sometimes the sync IS the horizontal...
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    using the original frayed cable from the cpu,...

    using the original frayed cable from the cpu, power it on w/o the display and measure the plug to see which pin contains the 12V then see if the new cable has 12V on the same pin and verify the...
  8. Replies
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    5,101

    < i ve only 0,3 ohm from pin 1 to pin 3 of the...

    < i ve only 0,3 ohm from pin 1 to pin 3 of the flyback....
    Across R753 multimeter say "1" with 200 and 2000 ohm scale....>

    If "1" means out of range then that resistor is bad (open)
  9. Replies
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    measure ohms between pins 1 and 3 of the flyback...

    measure ohms between pins 1 and 3 of the flyback and look carefully for open circuit trace on pin 1. That winding should provide 200VDC at C753 and your only getting 15V.
    Measure resistance across...
  10. Replies
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    5,101

    You could check for 30VDC across C751 as proof...

    You could check for 30VDC across C751 as proof whether the flyback is running. If he's not getting the 400V boost it could also be just R752 from pin 4 is open.
    It should be low ohms, hard to see on...
  11. If you have a schematic of the A2M6021 can you...

    If you have a schematic of the A2M6021 can you please share? I have not seen ANY schematics for Apple composite color monitors, only RGB like for the //gs

    Larry G
  12. Replies
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    good chance it's the display cable itself. I...

    good chance it's the display cable itself. I owned one of these BITD and heard of cable problems with some. I recall it has 4 or 5 pins, one of them is video, I can't remember if sync is on a...
  13. check for solder cracks on IC301 TCA1170. It's...

    check for solder cracks on IC301 TCA1170. It's the one with the U shaped metal heatsink surrounding it. The vertical drive circuit is totally feedback driven.
    Any open in the circuit causes the...
  14. oh yes, Hugo is correct, I didn't catch that the...

    oh yes, Hugo is correct, I didn't catch that the image is duplicated twice. Does the vertical hold control have any effect? It could be as simple as that control went open and just needs cleaning
    or...
  15. manual with parts list is in here: ...

    manual with parts list is in here:

    ftp://ftp.apple.asimov.net/pub/apple_II/documentation/hardware/misc/sams/
  16. adjust the vertical linearity control labelled...

    adjust the vertical linearity control labelled VLIN but it's inside on the board, you'll have to remove the back cover. Turn it to expand the bottom, then you might need to tweak the height control...
  17. Wow it's been 2.5 years or so. I did recently get...

    Wow it's been 2.5 years or so. I did recently get a CompuPro SPUZ slave Z80 board and got it to run 8 bit apps. I also found out that user MicrocomputerSolutions who had been so helpful passed away...
  18. The Sams ComputerFacts for the //c in here...

    The Sams ComputerFacts for the //c in here includes the schematic for the monochrome display.
    C514 hanging on the flyback is a documented troublemaker for shorting....
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    There is usually a ground wire harness on the...

    There is usually a ground wire harness on the backside glass of the tube and maybe a metal clip to chassis ground. Essentially the glass of the tube can charge like a capacitor.

    Larry G
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    with those chips, you must have a Videx Enhancer...

    with those chips, you must have a Videx Enhancer II? Asimov has a manual in here with schematic on the last page
    ftp://ftp.apple.asimov.net/pub/apple_II/documentation/hardware/video/
    if the...
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    ref Q3 2N3904 is a video amplifier that has...

    ref Q3 2N3904 is a video amplifier that has caused dim video

    Larry G
  22. I wonder if your head load problems would be due...

    I wonder if your head load problems would be due to a rubber bumper turning to adhesive goo inside the head load solenoid like I experienced a couple years ago?
    See...
  23. Thread: Bill Godbout

    by retrogear
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    Well that's where I live and I guess I shouldn't...

    Well that's where I live and I guess I shouldn't complain about the winters here, but I do. I had never heard of Bill Godbout or S-100 systems until maybe 10 years ago when I started using the simh...
  24. >I managed to make a GS/OS disk and a game disk...

    >I managed to make a GS/OS disk and a game disk for testing

    What was your source for this? Did you use ADTPro? If so, what image? It really sounds like gsos is loading drivers for something you...
  25. wait a minute, do you only have a 5.25 drive? I...

    wait a minute, do you only have a 5.25 drive? I don't think there is enough disk space to hold the full System 5.0.4 required to reach the Finder
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