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IBM PC AT 5170 Technical Reference (September 1985)

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The Technical Reference for the IBM Personal Computer AT (5170) dated September 1985 is IBM's design reference covering the type 1 and type 2 system boards. It is printed as "First Edition (September, 1985)", and its reader's comment form gives the part number 6280070. The hosted PDF has 500 pages. The BIOS listing is the 06/10/85 revision.

Contents

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From the manual's contents list (pp. vii to ix):

  • Section 1, System Board (1-1): memory and microprocessor (1-4), system performance (1-7), direct memory access (1-9), system interrupts, the hardware interrupt listing and interrupt sharing (1-12 to 1-14), system timers (1-22), system clock and ROM subsystem (1-23), RAM subsystem and I/O channel (1-24), connectors (1-25), I/O channel signal descriptions (1-31), NMI and coprocessor controls (1-38), other circuits (1-40) including the RAM jumpers, the display switch and the variable capacitor (1-41), keyboard controller (1-42), real-time clock and CMOS RAM information (1-56), specifications (1-69), connectors (1-71), logic diagrams for the type 1 board (1-76) and the type 2 board (1-98)
  • Section 2, Coprocessor (2-1)
  • Section 3, Power Supply (3-1): inputs (3-3), outputs, dc output protection and output voltage sequencing (3-4), no-load operation and the power-good signal (3-5), connectors (3-7)
  • Section 4, Keyboard (4-1): power-on routine, commands, scan codes, clock and data signals, layouts (4-15), specifications (4-22), logic diagram (4-23)
  • Section 5, System BIOS (5-1)
  • Section 6, Instruction Set (6-1)
  • Section 7, Characters, Keystrokes and Colors (7-1)
  • Section 8, Communications (8-1)
  • Section 9, IBM Personal Computer Compatibility (9-1)
  • Glossary, bibliography and index

The page numbering in Section 1 differs from the March 1984 edition, so page references do not carry across.

What this manual does not contain

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What it settles

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  • The two board sizes: type 1 about 30.5 by 35 cm (12 by 13.8 in), type 2 about 23.8 by 35 cm (9.3 by 13.8 in), and their memory: four banks of nine 128K-by-1 modules on type 1, two banks of nine 256K-by-1 modules on type 2 (pp. 1-3, 1-4).
  • The power supply specification (pp. 3-3 to 3-7), including the per-pin maximum currents on P8 to P12 (p. 3-7) and the 5 ohm, 50 W load resistor on P10 when no fixed disk is fitted (p. 3-5).
  • The system unit's weight of 20.0 kg (44 lb) (p. 1-69). IBM's 1989 service manual gives 19.05 kg (42 lb).

Pages that cite this document

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Download: IBM PC AT 5170 Technical Reference Sep85.pdf

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