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Type: Posts; User: andromeda92

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  1. I was doing this just out of curiosity, but I'm...

    I was doing this just out of curiosity, but I'm not going to invest in this motherboard anymore, I already have
    spent over $ 300 between components, boards, miscellaneous hardware etc ..., if I...
  2. If the problem comes from the VIA VT82C42N, this...

    If the problem comes from the VIA VT82C42N, this controller is more difficult to find to replace it while the VIA-II VT82C42N is more easily found
  3. there is no 7407, I only have a 7406. Otherwise...

    there is no 7407, I only have a 7406.
    Otherwise I replaced the 7406 (DM7406N), it still does not work, keyboard not responding.
    P27 is still LOW and P26 is LOW.

    I forgot to also say that the Num...
  4. I have a 7406, I will try to change it, on the...

    I have a 7406, I will try to change it, on the other hand I do not understand why the keyboard no longer works when at the beginning it worked, what could have caused the 7806 circuit or the via...
  5. GREEN LED = LOW RED LED = HIGH NORMAL LOGIC...

    GREEN LED = LOW
    RED LED = HIGH

    NORMAL LOGIC STATE

    1. VT82C42's P26 pin (CLOCK) should be sitting at LOW.
    2. VT82C42's P27 pin (DATA) should be sitting at HIGH.
    3. VT82C42's TEST0 pin should...
  6. Yes it has the same functions as that of your...

    Yes it has the same functions as that of your image, thank you for your explanations, I will report the tests with the results.

    EDIT:
    With the crocodile clips from logic sonde it is difficult to...
  7. i must testing below after a post ? and...

    i must testing below after a post ?



    and after testing above i test the activity below with pulse LED ?
  8. Where can the problem come from, a resistor or a...

    Where can the problem come from, a resistor or a capacitor?

    its possible to force P17 to LOW ?
  9. So, the keyboard is locked ?

    So, the keyboard is locked ?
  10. the measurement with the voltmeter is made...

    the measurement with the voltmeter is made between the VCC 5V and pin P17 ?

    EDIT:
    I made the measurements with the multimeter:
    If I measure with the voltmeter between P40 (vcc) and P17, I have...
  11. while waiting to receive my logic probe, is it...

    while waiting to receive my logic probe, is it possible to simulate the DEL key to access the setup bios, by shortcut for example two pins of the keyboard controller or another circuit?

    if not,...
  12. Yes, I will receive the logic probe this Tuesday....

    Yes, I will receive the logic probe this Tuesday.

    I did a cmos reset two days ago, I cut off the power then remove the battery, and leave all overnight until the next day.

    I suppose than P24...
  13. F1 not work. Yes, the keyboard was working...

    F1 not work.

    Yes, the keyboard was working with the motherboard before.

    I have tried other AT-class keyboards and is a same, it not work.

    Maybe without doing it on purpose I had to remove...
  14. If i disconnect keyboard i have message:...

    If i disconnect keyboard i have message:
    Keyboard error or no keyboard present

    if i connect keyboard, i don't have this error.
    so the keyboard is detected byt VT82C42N but it not work, i can't...
  15. Replies
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    1,776

    If i disconnect keyboard i have message:...

    If i disconnect keyboard i have message:
    Keyboard error or no keyboard present

    if i connect keyboard, i don't have this error.
    so the keyboard is detected byt VT82C42N but it not work, i can't...
  16. My keyboard is an AT keyboard. I will get a...

    My keyboard is an AT keyboard.
    I will get a logic probe by Tuesday, but I don't have a schematic of my motherboard, the connection schematic of VT82C42N is standard on the datasheet.
    The same that...
  17. I have no errors related to the keyboard, it's...

    I have no errors related to the keyboard, it's just that the keyboard doesn't work, the boot is done normally.

    For the test I just turn on the motherboard and a graphics card as well as the...
  18. Keyboard not work anymore on motherboard AP8548.

    Hi,
    I have an AP8548 socket 7 motherboard (80486DX2-S CPU at 66Mhz), the keyboard no longer works.
    I can boot but the keyboard does not work.
    I changed the 5 pin DIN socket, the fuse, there is...
  19. Replies
    2
    Views
    121

    thank you for your explanation.

    thank you for your explanation.
  20. Replies
    2
    Views
    121

    IBM 5155 and mode COM1

    Hi,
    On my IBM 5155 (co proc 8087, V20) with bios pc xt bios 3.1 under MS DOS 6.22.

    mode COM1:19200,N,8,1,P not work, the message is not supported but

    mode COM1:9600,N,8,1,P work.

    Serial...
  21. I have received my MCE2VGA and it work like a...

    I have received my MCE2VGA and it work like a charm with IBM 5155.

    On the other hand it is indicated nowhere the position of the switch on or OFF,
    we do not know in which direction it is ON or...
  22. I don't quite understand it, because if sync is...

    I don't quite understand it, because if sync is TTL, HSync and VSync CGA should work with the screen which takes into account TTL (+ 5v).
    R, G, B on CGA is not TTL level, is a signal.
  23. The monitor NEC AccuSync LCD71vm is 15khz,...

    The monitor NEC AccuSync LCD71vm is 15khz, spécification:

    ANALOG 0.7 Vp-p/75 Ohms
    Separate sync TTL Level (Positive/Negative)
    Horizontal sync Positive/Negative
    Vertical sync Positive/Negative
    ...
  24. I should receive the MCE2VGA soon, but do I...

    I should receive the MCE2VGA soon,
    but do I have to change the position of the switches on the motherboard (5 and 6) to go out on the CGA on my IBM 5155 ?
    Thanks for your help.

    EDIT:
    I think I...
  25. I have ordered one MCE2VGA.

    I have ordered one MCE2VGA.
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