Jump to content

IBM PC XT 5155 5160 Technical Reference (March 1986)

From RetroTechCollection

The IBM Personal Computer Hardware Reference Library: Technical Reference, "Revised Edition (March 1986)", is IBM's technical reference for the IBM Personal Computer XT (5160) and the IBM Portable Personal Computer (5155). The cover and the reader's comment form print part number 6139821; the scan's file metadata gives 6280089. The scan has 422 pages and a text layer.

It is the system manual of a two-part set. The options and adapters (display adapters, diskette and fixed disk adapters, communications cards and so on) are in a separate Technical Reference Options and Adapters manual, which this edition refers to but does not contain.

Contents

[edit | edit source]

From the manual's own contents list (pp. ix–xi):

  • Section 1, System Board (p. 1-1): description, microprocessor (p. 1-4), memory map, timers, interrupts, RAM and ROM, DMA, I/O channel and its signal descriptions (pp. 1-15 to 1-23), I/O address map (p. 1-24), speaker circuit and 8255A bit map (pp. 1-26, 1-27), specifications (p. 1-29), card specifications (p. 1-31), connectors (p. 1-32), logic diagrams for the 64/256K board (p. 1-34) and the 256/640K board (p. 1-46).
  • Section 2, Coprocessor (p. 2-1): the 8087.
  • Section 3, Power Supplies (p. 3-1): the XT supply (pp. 3-3 to 3-6) and the Portable PC supply (pp. 3-7 to 3-9).
  • Section 4, Keyboards (p. 4-1): the 83-key keyboard (p. 4-3) and the 101/102-key keyboard (p. 4-22), with layouts, scan codes and logic diagrams.
  • Section 5, System BIOS (p. 5-1): BIOS usage, and listings for the 256/640K board (dated 11/22/85, p. 5-11) and the 64/256K board (11/8/82, p. 5-111).
  • Section 6, Instruction Set (p. 6-1): 8088 and 8087.
  • Section 7, Characters, Keystrokes, and Colors (p. 7-1).
  • Glossary, bibliography and index.

What this manual does not contain

[edit | edit source]

It is a design reference, not a service manual. It has no removal procedures, no FRU part numbers and no symptom-to-FRU index; those are in IBM's Hardware Maintenance Service manuals. It does not cover the adapter cards, which are in the separate Options and Adapters manual. The logic diagrams show component designators, and the power sheets give filter capacitor values, but there is no bill of materials. There is no circuit diagram of either power supply; Section 3 gives specifications and connector pin assignments only.

What it settles

[edit | edit source]
  • The XT supply's output ratings: 15 A at +5 V, 4.2 A at +12 V, 0.3 A at −5 V and 0.25 A at −12 V, with the minimum loads, regulation tolerances, sense levels, 5.0 A and 3.5 A fuses and the 100–500 ms power good delay (pp. 3-3 to 3-5). Some online tables give 0.3 A for −12 V.
  • The system board filter capacitors on each rail, including C56 (+12 V), C58 (−12 V) and C68 (−5 V), on sheet 10 of the 64/256K diagrams (p. 1-44) and the matching 256/640K sheet (p. 1-56).
  • The slot J8 "card selected" requirement (p. 1-3) and the SW1 bit assignments, including "Loop on POST" (p. 1-27).
  • IBM's system unit dimensions, weight and environment (pp. 1-29 to 1-30), which differ slightly from those in IBM's 1989 service information manual.

Pages that cite this document

[edit | edit source]

Download: IBM PC XT 5155 5160 Technical Reference Mar86.pdf

[edit | edit source]
Retrieved from "https://retrotechwiki.com/index.php?title=IBM_PC_XT_5155_5160_Technical_Reference_(March_1986)&oldid=16487"