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5150 and 5160 problems

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  • bobba84
    replied
    Thanks guys I'll try and chase one up and see what happens!

    Leave a comment:


  • ibmapc
    replied
    Originally posted by Chuck(G) View Post
    Does that drive have the terminator pack installed? I couldn't tell from your vid.
    I'm with Chuck here. I replied to your other thread HERE
    Last edited by ibmapc; July 26, 2014, 08:37 PM.

    Leave a comment:


  • bobba84
    replied
    I think so. I tried another drive which I know works, but it acts the same. I'll have to try another floppy controller.

    Leave a comment:


  • Chuck(G)
    replied
    Does that drive have the terminator pack installed? I couldn't tell from your vid.

    Leave a comment:


  • bobba84
    replied
    Hi guys!

    An update on the 5150 (hopefully this post works, I've had trouble posting lately!)

    It boots fine, but the floppy drive goes insane! I can only show you what I mean:

    http://www.youtube.com/watch?v=o4471qGULYY

    I have tried two drives and two cables. Do you think the controller is stuffed? I could pull the floppy controller out of the 5160 but I kinda don't want to unless there are no other suggestions.

    Thanks in advance
    Bobby.

    Leave a comment:


  • bobba84
    replied
    Hi guys,

    Another update - the 5160 is going well now! But I have another strange problem with the 5150!

    It boots up okay now, but the floppy drive goes mental!

    www.youtube.com/watch?v=o4471qGULYY

    This video will explain it... Does anyone know what on earth it happening?

    I've tried a different floppy drive and another cable. Should I pull the floppy controller out of the 5160 and try that?

    Thanks!
    Bobby.

    Leave a comment:


  • bobba84
    replied
    Originally posted by modem7 View Post
    Yes, 10 bad RAM chips is "quite a few".

    I have added your faulty motherboard to the list at [here].
    Cool!

    Leave a comment:


  • modem7
    replied
    Originally posted by bobba84 View Post
    it seems I had quite a few bad RAM chips on the motherboard
    Yes, 10 bad RAM chips is "quite a few".

    I have added your faulty motherboard to the list at [here].

    Leave a comment:


  • bobba84
    replied
    Hi guys,

    Just an update for those who might be interested - thanks to Ray's generous help with the Landmark ROM I was able to get it booted - it seems I had quite a few bad RAM chips on the motherboard (plus the original problem of a short due to a bad tantalum cap on my 384k RAM expansion card) - so now I am just sorting through what RAM chips I have lying around to get a full 256k of good ones again. I have a toasted xt clone board with a few so I might have enough. Needless to say I'm a happy chap!

    Thanks again to all who helped / contributed!

    Bobby.

    Leave a comment:


  • bobba84
    replied
    Hi again modem7,

    I have had it with my EPROM programmer. It's a cheap nasty one and I've wasted two 27c256's on it!

    I noticed you are also in Melbourne - would it be okay if I took you up on the offer of replacement BIOS chips? I'll send you money to cover them!

    Leave a comment:


  • bobba84
    replied
    Thanks modem7. I'll try swapping the RAM from the other banks first, then look at the BIOS. I have an eprom programmer, but no chips of that size. I'll buy one from the local guy if my bios appears bad.

    Appreciate all your help!

    Leave a comment:


  • modem7
    replied
    Originally posted by bobba84 View Post
    I got to the end of the instructions where it asked me to swap the RAM chips in banks 0 and 1 - which I did, but it still won't post.
    The failure of any of many components on the motherboard will cause an 'appears dead' symptom. Faulty RAM in bank 0 is one relatively common cause, and that is why there was the suggestion to try swapping bank 1 RAM with bank 0 RAM. And it's easy to do on a 5160 motherboard.

    But you cannot cross out faulty bank 0 RAM off the list yet. It could be that you have multiple faulty RAM chips scattered over both banks 0 and 1. If so, swapping those banks does nothing (other than perhaps rectifying a bad electrical connection). Your 5160 motherboard is the 256K type, and that means that all four banks use the same type of RAM chip (although possibly of different manufacturer). The chances of faulty RAM in all four banks has to be pretty low. Try swapping bank 2 into bank 0, and if that does not change things, then try swapping bank 3 into bank 0. Of course, while you are doing that, use ESD protection practices.

    Your 5150 motherboard is operational. You could try swapping the 8088 CPU chip from that into the 5160.

    Failure of a BIOS ROM is another possibility. Do you have an EPROM programmer and 27256 (or 27C256) EPROMs? If so, you could try the Supersoft/Landmark diagnostics at [here], or make replacement BIOS ROM chips from the images at [here]. If not, I can post EPROMs to you.

    Originally posted by bobba84 View Post
    The speakers makes a 'tick' noise when power is applied, but I remember it doing this when first powering on even when it worked.
    Yes, ignore that. It results from a surge of current going through the speaker when power is applied to the motherboard.

    Leave a comment:


  • bobba84
    replied
    It has 256k on board, with jumpers set correctly. All cards removed. I might pull the board out of the case tonight and check the bottom for dry joints, etc. It's all I can think of at present. The power supply runs the 5150 board fine, so I'm pretty sure that's okay.

    Leave a comment:


  • SpidersWeb
    replied
    Only bank 0 is required for boot.
    If the amount is incorrect on the switches it'll still start up and beep.

    Leave a comment:


  • Chromedome45
    replied
    So how much RAM is on the Motherboard right now? 256k? Did you remember to set the jumpers to indicate that amount? I am guessing you have the 384K RAM card still pulled out? Just my guess as to what is happening. Good luck

    Leave a comment:

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