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minus zero degrees 0 ibm 51xx pc family computers this website minuszerodegrees net is intended to be a reference for computer savvy people who are already familiar with the ibm 51xx pc family of vintage computers this website contains information that ranges from basic to very technical this website is not intended to be viewed via a mobile cell phone for queries or assistance i suggest that you seek that at the vintage computer federation forums manuals ibm 4860 5140 5150 5155 5160 5162 5170 ibm options and adapters ibm hardware maintenance service ibm hardware maintenance reference ibm dos ibm some documentation errors third party 4860 pcjr 5140 pc convertible 5144 pc convertible monochrome display 5145 pc convertible color display 5150 pc 5151 monochrome display 5152 graphics printer 5153 color display display for cga 5154 enhanced color display display for ega or cga 5155 portable pc actually a portable xt 5160 xt 5161 expansion unit 5162 xt model 286 xt 286 an at class system not xt 5170 at 5175 professional graphics display display for pgc 5181 pc compact printer intended for the ibm pcjr 5182 pc color printer ibm 4860 documentation ibm 5126 documentation ibm 5140 documentation ibm 5144 5145 documentation ibm 5150 ibm pc basics power supply documentation power measurements motherboard switch jumper settings minimum diagnostic configuration known problems issues test of sw1 and sw2 via basic motherboard versions keyboard support bios revisions vga cards some ibm expansion cards and options disk cover plate memory map of the 640 kb to 1 mb area substituting the u33 bios rom ram information 10 27 82 bios problem of less than 4 banks of ram floppy drive support early versions hard drive support external 3 5 diskette drive motherboard diagrams adding a real time clock rtc cassette basic 8087 math co processor npu startup sequence ram refresh post some errors post detailed breakdown ibm 4450 tempest version of 5150 ibm 5151 documentation known problems issues power up video cable crt s cathode heater flyback transformer ibm 4451 tempest ibm 5152 documentation power up ribbon ibm 5153 documentation known problems issues power up video cable dark yellow to brown ibm 4453 tempest ibm 5154 documentation known problems issues power up video cable flyback transformer colour mapping ibm 5155 ibm portable pc basics power supply documentation power measurements motherboard switch jumper settings minimum diagnostic configuration known problems issues test of sw1 via basic motherboard versions expansion slot 8 bios revisions photo of inside some ibm expansion cards and options crt display unit memory map of the 640 kb to 1 mb area external 3 5 diskette drive ram information adding a real time clock rtc floppy drive support 8087 math co processor npu hard drive support motherboard diagrams cassette basic startup sequence post some errors post detailed breakdown ibm 5160 ibm xt basics power supply documentation power measurements motherboard switch jumper settings minimum diagnostic configuration known problems issues test of sw1 via basic motherboard versions keyboard support bios revisions vga cards some ibm expansion cards and options expansion slot 8 memory map of the 640 kb to 1 mb area significant differences to the ibm 5150 ram information rom information ibm xebec hdd controllers supplied floppy drive support hard drive cabling hard drive support external 3 5 diskette drive motherboard diagrams adding a real time clock rtc cassette basic 8087 math co processor npu startup sequence ram refresh post some errors post detailed breakdown ibm 4455 tempest version of 5160 ibm 5161 basics cable documentation photos extender card switch settings modern reproductions 5160 models not supported ibm 4458 tempest version of 5161 diagrams ibm 5162 ibm xt model 286 basics power supply documentation setup procedure motherboard switch jumper settings battery known problems issues 80287 math co processor npu motherboard versions post codes bios revisions some ibm expansion cards and options photos memory map of the 640 kb to 1 mb area ram information rom information floppy drive support hard drive support motherboard diagrams cassette basic startup sequence ibm 5170 ibm at basics power supply documentation setup procedure motherboard switch jumper settings battery known problems issues 80287 math co processor npu motherboard versions keyboard support bios revisions post codes some ibm expansion cards and options post some errors memory map of the 640 kb to 1 mb area ram information failures of the cmi 6426 hard drive rom information load resistor floppy drive support hard drive support motherboard sockets u17 u37 motherboard diagrams ibm 4459 tempest version of 5170 cassette basic startup sequence ibm 5175 documentation ibm 5181 documentation ibm 5182 documentation ibm 4454 tempest version of 5182 rom s images of various rom s eprom programmers images of bios rom s for ibm 5150 5155 5160 5162 5170 eprom programming services images of bios rom s for certain xt clones images of bios rom s for certain at clones ruud s diagnostic rom for ibm 5150 5155 5160 supersoft landmark diagnostic rom s for ibm 5150 5155 5160 5170 miscellaneous programs commonly failing electronic components in vintage computers rtc programs changes to the st 506 st 412 interface mda cga ega micro solutions backpack cd rom drive bios video modes transferring files from a modern pc to an old pc post cards history of 5150 5155 5160 5170 motherboard failure at the vcf resources at other internet sites floppy crossover cable wiring serial ports timeline dos microsoft mouse some floppy maths kodak disk drive analyzer test equipment laplink system board photos out of scope xt ide card hard disk drive clocks esd ics mounted in frame laptops external power supply unregulated versus regulated 15 things about programming some electronics information cmos batteries trio cs 2110 bios passwords bios settings ebay lingo ray s playlist criticality ray s thoughts 0 writing failures funny index partial index