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IBM PC 5150 and IBM PC XT 5160 FAQ

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    #16
    I got one of these letters with a 5150 I got from kijiji. Though I share it here in case someone wants a copy.

    Dear New Owner.jpg

    Comment


      #17
      I have an IBM 5160 that has a BIOS ROM U18 with IBM part number 500026. The ROM is a ceramic package with a gold lid.

      The motherboard is also slighly different than the two shown here:
      http://www.minuszerodegrees.net/5160..._revisions.htm

      Mine has an Intel 8088.

      It also has the number 4073 stamped to the right of the silkscreen "64 - 256KB SYSTEM BOARD"


      I read that nobody has seen one of these motherboards in the wild and have not seen this BIOS PROM.

      Is this system one of the first beta XT's?

      Comment


        #18
        apologies if this question has come up. Were all 5150 motherboards brown? Were all 5160 motherboards green?

        Comment


          #19
          No, they can be either brown or green.

          Comment


            #20
            Just wanted to mention that you don't absolutely need an expansion chassis to use a hard drive with a 5150. The one I have had a Miniscribe 21MB 3.5" MFM drive working fine with the stock 63.5w power supply, and it's been in the machine since 1987. As long as the power draw isn't too much for the PSU it works fine, even for booting. Newer or smaller drives are more likely to work.

            This isn't exactly a secret, but there doesn't seem to be much mention of using HDDs with these so I figured I'd chime in.

            Comment


              #21
              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/XT/AT rear screws, Intel INBOARD 386AT card, IBM 5140 keyboard, very early IBM PC (S/N: under 5000)
              My IBM PC hardware collection

              Comment


                #22
                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/XT/AT rear screws, Intel INBOARD 386AT card, IBM 5140 keyboard, very early IBM PC (S/N: under 5000)
                My IBM PC hardware collection

                Comment


                  #23
                  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

                  Comment


                    #24
                    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/XT/AT rear screws, Intel INBOARD 386AT card, IBM 5140 keyboard, very early IBM PC (S/N: under 5000)
                    My IBM PC hardware collection

                    Comment


                      #25
                      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.

                      Comment


                        #26
                        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/XT/AT rear screws, Intel INBOARD 386AT card, IBM 5140 keyboard, very early IBM PC (S/N: under 5000)
                        My IBM PC hardware collection

                        Comment


                          #27
                          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.

                          Comment


                            #28
                            I use that hole in the 5150 to snake out cables.
                            My Retro Computing and Vintage Gaming Blog : http://nerdlypleasures.blogspot.com/

                            Comment


                              #29
                              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/XT/AT rear screws, Intel INBOARD 386AT card, IBM 5140 keyboard, very early IBM PC (S/N: under 5000)
                              My IBM PC hardware collection

                              Comment


                                #30
                                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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