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Thread: Ibm pc 5150a..... Possibly a pre-release build???

  1. #211
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    Quote Originally Posted by compaqportableplus View Post
    With all this talk about early 5150s, how about the newest one anybody has ever come across? I’ve got one that was made in 1986 which has a 130W XT PSU.

    I’d also like to see very early production XTs as well.
    I have one from late 86, out of AU, 63.5W 220V PSU (but that died, so now it has a 130W XT PSU too). I don't remember the exact date.

  2. #212

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    Quote Originally Posted by SpidersWeb View Post
    I have one from late 86, out of AU, 63.5W 220V PSU (but that died, so now it has a 130W XT PSU too). I don't remember the exact date.
    Cool. I still need to get a few pics of my late-model PC.
    Compaq - “It simply works better”

  3. #213
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    Another thing to consider with early models does it still have the original BIOS or was it replaced?

    I have one with the original 5700051 gold rom bios. I got the computer is super condition, I guessing, because the bios was bad and I'd bet someone put it in a closet for 30 years. I kept the BIOS but used a later version to run the computer. I documented this board here http://www.vcfed.org/forum/showthrea...highlight=5150 You might need to right click on each image to view it, I had to. The photos are still online.

    I got IBM CPM and PC DOS for an OS for it. It also can run MS FLTSIM 1.0 that I have. It really is one of my prize possessions.

    From what I understand is the 1st batch was 20,000 units.

    framer

  4. #214

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    I have also one with first bios and two SS drives, but serial number is 32291.

    IMG_7707.jpg

    https://ibm-pc.webnode.sk/_files/200...f/IMG_7707.JPG
    IBM PC 5150(A): IBM PC 5150(B): IBM PC 5160 (64-256k): IBM PC 5160 (256-640k): IBM PC 5170 (099): IBM PC 5170 (319/339): IBM PC 5140: IBM PC 5162: IBM PC 5155: IBM PC Expansion Unit 5161:
    WANTED!: IBM 5175 monitor, IBM 5145 monitor, IBM PC/XT/AT rear screws, Intel INBOARD 386AT card, IBM 5140 keyboard, very early IBM PC (S/N: under 5000)
    My IBM PC hardware collection

  5. #215
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    Don't get upset with me but I believe those two units were from the 2nd batch released. The black power supply with recessed nuts and the plastic speaker mounts were not from the 1st batch that had a dk brown anodized? color with nuts on the top that were not recessed and a metal speaker mount. Still you got a couple of fine units. The 3nd and later batchs removed some holes in the back of the case.



    framer

  6. #216

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    I am ok with this, but is quite curious that my relatively later model (40/81 - early 1982 ) sold in may 1982 is still equipped with first version of bios. In contrast, my little earlier model (SN: 28260) is equipped with second version of bios.
    IBM PC 5150(A): IBM PC 5150(B): IBM PC 5160 (64-256k): IBM PC 5160 (256-640k): IBM PC 5170 (099): IBM PC 5170 (319/339): IBM PC 5140: IBM PC 5162: IBM PC 5155: IBM PC Expansion Unit 5161:
    WANTED!: IBM 5175 monitor, IBM 5145 monitor, IBM PC/XT/AT rear screws, Intel INBOARD 386AT card, IBM 5140 keyboard, very early IBM PC (S/N: under 5000)
    My IBM PC hardware collection

  7. #217
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    I'd bet somewhere for whatever reason it was replaced. IE. The original went bad, then someone found a replacement cheap when others were upgrading and it was cast off.

  8. #218

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    https://www.ebay.com/itm/123894075680?nordt=true

    This seller is selling IBM PC 5150 early Rev. but BIOS seems to be upgrade.
    S/N is 0100887

  9. #219
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    Yeah, that is machine #887, very early production PC. Missing original power supply and it's a shame to see the hard drive upgrades in these early machines, but it does at least still have the early style metal speaker bracket. BIOS is upgraded of course, but it does appear the motherboard is likely original along with the floppy controller. The floppy drive is double sided. It has an 8087 ... I wonder if it also has the cpu interrupt bug. I came across an early revision PC that had the bugged CPU with the 8087 haha

  10. #220
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    IMHO the upgrade make it worth 1/2 of what they are asking. I'd bet the covers from a "B". The PS kills it.

    Chassis, MB, Floppy controller and speaker seem original. It should be parted.

    framer

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