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5150 - keyboard issues

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    #16
    Originally posted by SpidersWeb View Post
    I've had with a few other Model F's - where either a key "foot" isn't sitting right or the PCB itself has something partially conductive on it (by PCB, I mean the area where each key touches the PCB). I've had this cause stuck keys, DOS crashes etc before - but running with the keys removed (just using my finger on the PCB) it'd work correctly.

    Good luck with the 8051!
    I did that too! Before I put it back together (for the 2nd time), I tried just about everything I could. When I first started this thread I could use my fingers to "press keys" Only the enter key ever really worked reliably. I even cleaned all EIGHTY THREE flappers, but no avail.

    @KC9UDX

    I agree. I also wish I had a 2nd machine so I can definitely rule out the keyboard and not a problem with the motherboard. I have TEN 5 pin din style keyboards at my disposal, and none are compatible.
    It is a mistake to think you can solve any major problems just with potatoes.

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      #17
      The converter that some use here employs a single 8-pin PIC12F629 MCU. You wouldn't even need a PCB to build it--there are only a couple of passives involved--not even a crystal.
      Reach me: vcfblackhole _at_ protonmail dot com.

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        #18
        Originally posted by Trixter View Post
        Stone assumes everyone who posts is very familiar with the system they are asking help for...
        Hardly...

        88 ╪ 83

        When you have the item in question in your possession it isn't very difficult to accurately assess its visible features.

        Posting inaccurate information when seeking to acquire help from others is akin to sending those who are attempting to help you down a rabbit hole.

        If counting the keys is too mundane a task in your search for assistance from those who are quite willing to offer their time to you then you're asking a bit too much, IMO.

        A wild goose chase is something I never liked and still don't.
        PM me if you're looking for 3" or 5" floppy disks. EMail For everything else, Take Another Step

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          #19
          '╪'<>'≠'
          Be polite and I may let you live.

          https://www.youtube.com/playlist?lis...5NBVfKX5471R9U

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            #20
            Also take a look at the keyboard female connector on the motherboard, maybe it is dirty or it has bad solder joints. Move the keyboard plug with the computer powered on while pressing some keys and check if the behaviour changes.
            My videos:
            IBM PS/1 model 2011 restored and enhanced
            IBM PC Advanced Diagnostics Cassette load

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              #21
              Originally posted by nestor View Post
              Also take a look at the keyboard female connector on the motherboard, maybe it is dirty or it has bad solder joints. Move the keyboard plug with the computer powered on while pressing some keys and check if the behaviour changes.
              I thought about that. Tried it quickly this morning, but it didn't help.
              It is a mistake to think you can solve any major problems just with potatoes.

              Comment


                #22
                Originally posted by Stone View Post
                Posting inaccurate information when seeking to acquire help from others is akin to sending those who are attempting to help you down a rabbit hole.
                If counting the keys is too mundane a task in your search for assistance from those who are quite willing to offer their time to you then you're asking a bit too much, IMO.
                FWIW, I agree with your philosophy. I just think your delivery needs a little work
                Offering a bounty for:
                - A working Sanyo MBC-775 or Logabax 1600
                - Music Construction Set, IBM Music Feature edition (has red sticker on front stating IBM Music Feature)

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                  #23
                  Originally posted by luckybob View Post
                  I thought about that. Tried it quickly this morning, but it didn't help.
                  Have you verified that the cable is good? Based on your description, I guess it is, but it would be simple enough to check.
                  Be polite and I may let you live.

                  https://www.youtube.com/playlist?lis...5NBVfKX5471R9U

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                    #24
                    Originally posted by Trixter View Post
                    FWIW, I agree with your philosophy. I just think your delivery needs a little work
                    Admittedly, I have a very low tolerance threshold for the rabbit hole scenario, especially when it's instigated by someone who's also been here as long as I have... eight years. I just don't see any reasonable excuse for someone of that stature to be so lax, to put it mildly.

                    In a nutshell, if you gonna ask for help at least have the courtesy to do your homework FIRST. If you're expecting the people you are seeking help from to do it for you (as well) you probably should be asking your parents (for help) instead of us.
                    PM me if you're looking for 3" or 5" floppy disks. EMail For everything else, Take Another Step

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                      #25
                      You are so correct! The mistake of me saying 88 keys verses 83 COMPLETELY entitles you to be a total knob-end. It was my fault that in 8 years (OMG REALLY?) I never owned a 5150, and never until last week had any need to learn the idiosyncrasies of such a system.

                      It is plain for me to see now, the extra 5 keys I thought I had on my keyboard really would have caused you so much grief. All I can do is throw myself at your feet and hope for forgiveness. I have truly learned, no questions about old computer parts are allowed on an old computer forum. I am to scour the earth in solitude, searching for answers myself and then hoard them to prevent others from also learning. Lesson learned.

                      @KC9UDX

                      I did probe the cable with a multi-meter and I did find 5v, ground, what appears to be an AC voltage on the clock. Not having a scope, I can only guess, but from what I do know (which isn't much according to some people), all signs point to the cable being fine. I got my old 8051 project kit out, and I'm going to give it the old college try, as a PC-PS/2 adapter.
                      It is a mistake to think you can solve any major problems just with potatoes.

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                        #26
                        A better test is a simple continuity test. Otherwise you risk seeing a circuit's return rather than the cable itself, if in fact there's a break or high resistance path in the cable.
                        Be polite and I may let you live.

                        https://www.youtube.com/playlist?lis...5NBVfKX5471R9U

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                          #27
                          UPDATE:

                          I think I mentioned I did not have a spare compatible keyboard. Turns out that wasn't 100% correct. (Please forgive me Stone!) I have a cheap knockoff model M made by keytronic, it has a hole for the XT/AT switch, but no switch. So I ripped it apart, which was easy. It doesn't have a single screw in it. The space for the switch was unpopulated, but all it did was pull a pin on the sole IC to ground. So I blobbed a bit of solder on the connection and gave it a whirl:



                          I'm very happy! I need to clean the floppy drives as both will spit out random errors. I want to thank everyone for their assistance. Even you, Stone. I'm happy the computer is fine, and all I need now is to source a new keyboard pcb.
                          It is a mistake to think you can solve any major problems just with potatoes.

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