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Type: Posts; User: philippe_d

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  1. 55248

    55248
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    Hello all, My 5150 is working again......

    Hello all,

    My 5150 is working again... however I never found the issue. I was lucky enough to get another broken mainboard(blown capacitor, no image and continues beep from the speaker) I started...
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    Hi Chuck, I got an oscilloscope now to probe...

    Hi Chuck,

    I got an oscilloscope now to probe with instead of a logic probe. I've been probing around but I actually have no idea how I should probe what. I found the address lines on the isa-bus...
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    Ok, a logic probe seems easy to get. If I have...

    Ok, a logic probe seems easy to get. If I have one, What do you want me to test with it?
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    Just a multimeter

    Just a multimeter
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    Still the same. No led, no drive spin Returns...

    Still the same.
    No led, no drive spin

    Returns still 0
  7. I have a similar issue. I got a PS/2 30...

    I have a similar issue.
    I got a PS/2 30 completely working hard drive and floppy drive but when I opened it I saw the floppy drive cable was heavily damaged. the bare wires of the flatcable were...
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    I am such an idiot...... I forgot to change...

    I am such an idiot......
    I forgot to change switch 5 and 6 back to off... So my monitor isn't broken it was pebkac... (the monitor at least, I still get the 601)
    So now when I type "PRINT...
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    Only if we fix the 5151 monitor first... It just...

    Only if we fix the 5151 monitor first... It just broke... last time I used it it worked fine but I just tried again to do the test and the screen stays black.
    For the monitor I'm actually scared to...
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    So just to make this clear, I'm currently using...

    So just to make this clear, I'm currently using vga, I am mentioning this because I think it may be influencing the result of this test.
    I tested the "PRINT INP( &H3b5)" command but it doesn't...
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    Ok, I found GWbasic on the hard drive. I...

    Ok, I found GWbasic on the hard drive.
    I transfered the controller and disk drives again from the 5150 to the XT clone.
    I entered GWBASIC and the command
    print inp(&h3f4)

    On the XT clone it...
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    I would say it fails at the 2nd step. The reset...

    I would say it fails at the 2nd step. The reset of the disk controller fails....
    Because it doesn't skip the test so step 1 passes.
    We always get a 0 returned whenever we try to talk to the...
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    I tried all ISA slots one by one, they all result...

    I tried all ISA slots one by one, they all result in POST 601 and all return 0 on the basic command also the one with the video card. (I moved the video card to another slot and put the floppy...
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    I did the same test but with different results: ...

    On both my 5150's, 16 was seen !!!
    Then I discovered that if I powered up the 5150's with its floppy drive disconnected from the controller, then I saw 128.

    If I removed the floppy controller...
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    So on mine it returned 0. With floppy controller...

    So on mine it returned 0. With floppy controller and drives connected.
    I need to try what you did and see if I get a different result with the floppy controller removed
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    Chuck, I also wanted to test the basic...

    Chuck,

    I also wanted to test the basic commands you asked on the XT clone but there doesn't seem to be a basic on that machine.
    It has 7 free sockets labeled ROM 0 to ROM 6.
    Would it be safe to...
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    And I checked all the voltages on the ISA slot....

    And I checked all the voltages on the ISA slot. They are all present.
    B3 +5V, B5 -5V, B7 -12V, B9 +12V, B29 +5V
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    Ok, i'll try that again with &H1C

    Ok, i'll try that again with &H1C
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    Yes, They are a matched pair of standard IBM...

    Yes, They are a matched pair of standard IBM branded full height drives.
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    I checked sw1:7/8 for continuity. The switches...

    I checked sw1:7/8 for continuity. The switches work fine so not a broken switch...
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    No, I haven't checked that yet but that is a good...

    No, I haven't checked that yet but that is a good point. I'll do that thanks.

    I checked the -5 volt pin on the ISA slot as well now. It measures -4.7V Could this be too low or is it still within...
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    I've been doing some extra testing. 1. I...

    I've been doing some extra testing.
    1. I installed controller and floppies in the XT and everything works fine in the XT
    2. I installed the PSU of the XT in the 5150 and moved the controller and...
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    I just used my multimeter to check the continuity...

    I just used my multimeter to check the continuity between the ISA bus and the 8259 on IRQ6. continuity for the IRQ 6 channel is ok.
    For the DMA, I located the 8237 but I'm not sure which pin to...
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    I have tried the XT controller in the 5150 but...

    I have tried the XT controller in the 5150 but also this controller doesn't work in the 5150. no spin no leds turning on, just the 601 error....
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    It is this one :...

    It is this one : http://minuszerodegrees.net/5150/early/5150_later_diskette_adapter_3996x2054.jpg
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