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    Compaq Portable II Power Supply Issue ?

    Greetings All !!

    Just picked up a Compaq Portable II that seems to have a power supply issue. The computer will work perfectly fine and out of nowhere, it will freeze up. I can't do anything....
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    Thanks VERAULT ! Figures, I am 12 pads short from...

    Thanks VERAULT ! Figures, I am 12 pads short from my last 2 orders from them. They always send extras so looks like I will need to order from them again.
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    Compaq Portable II Keyboard Question

    Hello All,

    I just picked up a Compaq Portable II and it has a non-working keyboard. Can someone tell me if these keyboards suffer the same "foam rot" as the original Compaq 1 keyboards before I...
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    So, I installed the new transistor and when I...

    So, I installed the new transistor and when I powered up the PS, a tantalum cap went up in flames. I assumed this was a good sign as there was low voltage power being produce but after replacing the...
  5. Thanks Chromedome - Can you recommend a way to...

    Thanks Chromedome - Can you recommend a way to temporarily use a standard 3.5 floppy to run the reference disk with ? I know I will need some type of converter connector. I would like to get the...
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    I just replace one yesterday. They are the same...

    I just replace one yesterday. They are the same as a standard 2 pin Tantalum cap. Just use a meter and see which pin is ground. That's your negative lead. If you use a meter and check continuity, you...
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    I got this one laying around which came out of a...

    I got this one laying around which came out of a 5150. I believe it's fully loaded but not sure if it's IBM or not ?

    58985
  8. IBM PS/2 Model 50 1.44MB ALPS Floppy Drive Wanted

    Looking for a working or non-working original IBM ALPS 1.44MB Floppy drive for a Model 50 or one that would fit without hacking. Part number is DFP723D12B. Would prefer working.

    PM me !!
    ...
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    Thanks, both of you guys !! It's much appreciated...

    Thanks, both of you guys !! It's much appreciated !! Looks like I have a bad Tantalum cap on the main board and both my PS are fine.
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    IBM Model 50 Z Power Supply Question

    Greetings all,

    I received an IBM PS2 Model 50 Z that will not power on. Can someone tell me if the power supply for these units will power on without a load present ? I removed the motherboard and...
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    Looks like I have a shorted transistor at...

    Looks like I have a shorted transistor at location Q1. I order another one. It's a 2N5639 which is a JFET Chopper Transistor. Just ordered a bunch.
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    Thanks SpaceDog, I have it on the bench now. I...

    Thanks SpaceDog, I have it on the bench now. I will be checking the most common parts to fail. Do you think I should replace all the electrolytic caps first ?
  13. IBM PS2 Model 50 Z Power Supply Question.

    Greetings all,

    I received an IBM PS2 Model 50 Z that will not power on. Can someone tell me if the power supply for these units will power on without a load present ? I removed the motherboard and...
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    I am definitely interested. My left hinge is...

    I am definitely interested. My left hinge is broken. I might take a few extra pairs from you should I come across more P70s. This is a very common problem with these.
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    Compaq Portable 1 3rd Party Power Supply

    Greetings all,

    I might need to replace the stock power supply in my Compaq Portable 1 computer. I was wonder if someone can recommend an open frame power supply with proper wattage that would fit...
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    Very interesting. This is actually my 2nd SLT286....

    Very interesting. This is actually my 2nd SLT286. I just replaced the Dallas Real Time chip on this one and its working so decided to restore it. I like all my vintage computers to be as it came from...
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    Yes, my drive also had a felt pad on top. I just...

    Yes, my drive also had a felt pad on top. I just called it a "fake head" lol. Now, what gets me thinking is the model number of this drive as it contains the "2"
  18. Best way top mount TWO 1/2 Height floppy drives on an IBM 5150 ?

    Greetings All !!!

    Was wondering if someone can tell me the best way to mount two 1/2 height floppy drives in an IBM 5150 ? I would like to know if they sell a kit somewhere and if you have a link,...
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    Hey Stone !! What happens is after I run the...

    Hey Stone !! What happens is after I run the Compaq setup utility, and exit out (not power down) the hard drive works perfectly. I will load the OS (DOS) and everything is great. Once I power down...
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    So, I replaced the original hard drive with a...

    So, I replaced the original hard drive with a Conner CP3012E (120MB) hard drive but no matter what type I set it to in CMOS, it will not boot with it. Looks like the BIOS shuts it down after checking...
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    Thank you guys !! WBST - thank you for the link....

    Thank you guys !! WBST - thank you for the link. I seen the diagram an it makes sense now. I replaced the backup battery and it's storing the RTC and CMOS settings just fine now. I will pull the...
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    IBM PS/2 L40 SX Laptop Internal Batteries

    Greetings All !!

    I went to replace the CMOS battery in my IBM PS/2 L40SX Laptop only to discover that it actually has 2 separate batteries internally. It has one 3V Lithium battery and one 3.6v...
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    Compaq SLT296 Compatible Hard Drive Wanted

    Greetings all !!

    I am looking for an IDE Hard Drive that will work in a Compaq SLT286 Portable. It requires a specific hard drive "Type" such as a Conner IDE Type 2 for an example. If you have one...
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    Chuck, you think this drive should be a double...

    Chuck, you think this drive should be a double sided drive ? I wouldn't doubt it. This would lead me to believe that a head has failed and that someone not only removed the faulty head, but went...
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    Thanks again all for the help !! I am assuming...

    Thanks again all for the help !! I am assuming because I fully dissembled the floppy drive and reassembled it again, the head did not align to track 0. All I did was format a disk as 180K in a known...
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