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Thread: IBM PC 5150 and IBM PC XT 5160 FAQ

  1. #21

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    Quote Originally Posted by tipc View Post
    apologies if this question has come up. Were all 5150 motherboards brown? Were all 5160 motherboards green?
    or dark dark purple

    in my experience: 1981-1984 - green
    1984-1985 - brown
    1985-1987 - dark purple
    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 screws, IBM Type13/WD 25 Hard Drive front panel/mask
    My IBM PC hardware collection

  2. #22

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    Whats the purpose of this hole?

    ibmpcatback.jpg

    I know that on XT-286 serve it for battery pack, but i have it also on my early XT case (05/1983) and i guess that in 1983 nobody think about batteries for CMOS RAM or?
    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 screws, IBM Type13/WD 25 Hard Drive front panel/mask
    My IBM PC hardware collection

  3. #23

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    My XT has it. I thought it was an emergency exit!
    PM me if you're looking for 3" or 5" floppy disks. EMail For everything else, Take Another Step

  4. #24

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    Quote Originally Posted by Stone View Post
    My XT has it. I thought it was an emergency exit!
    Emergency exit screwed from outside?
    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 screws, IBM Type13/WD 25 Hard Drive front panel/mask
    My IBM PC hardware collection

  5. #25
    Join Date
    May 2006
    Location
    Melbourne, Australia
    Posts
    6,238

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    Quote Originally Posted by romanon View Post
    Whats the purpose of this hole?
    I am pretty sure that the question has been asked on this forum before. One of the suggestions was that IBM may have been allowing for a possible future use where all slots are populated (i.e. no slot blanking panels), and a cable needs to be run from inside the case to outside the case.

  6. #26

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    Quote Originally Posted by modem7 View Post
    I am pretty sure that the question has been asked on this forum before. One of the suggestions was that IBM may have been allowing for a possible future use where all slots are populated (i.e. no slot blanking panels), and a cable needs to be run from inside the case to outside the case.
    So place here battery pack in XT-286 was great idea. At least some...

    I suppose, that for same purpose is whole on IBM 5150

    5150_later_case_rear_barcode1 (1).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 screws, IBM Type13/WD 25 Hard Drive front panel/mask
    My IBM PC hardware collection

  7. #27
    Join Date
    May 2016
    Location
    Fairfield, Ohio
    Posts
    408

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    I always thought it was a blank to mount an extra serial or parallel port. Later tower designs included pre-cut blanks you could punch out for a db9 or db25 connector.

  8. #28
    Join Date
    Mar 2006
    Location
    Massachusetts, USA
    Posts
    1,877

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    I use that hole in the 5150 to snake out cables.
    My Retro Computing and Vintage Gaming Blog : http://nerdlypleasures.blogspot.com/

  9. #29

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    I want to know something about late XT motherboards, which was redesigned from 64-256k to 256-640k. I saw some MBs which has sticker on "64-256k" and there was "256-640k" written like here:

    IBM 5160 Motherboard.jpg

    Also circuit 74LS158N was added to socket U84
    It can be assumed, that IBM recycles their older motherboards to produce 256-640k boards, or it is clearly custom made?

    I have also such a motherboard, mine sticker is actually writen by hand...

    256640.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 screws, IBM Type13/WD 25 Hard Drive front panel/mask
    My IBM PC hardware collection

  10. #30

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    Adding a 74LS158N to U84 and soldering a wire to jumper pad E2 allows you to put 640k in what previously was a 64-256k board.
    PM me if you're looking for 3" or 5" floppy disks. EMail For everything else, Take Another Step

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