IBM 5161

The IBM Personal Computer, commonly known as the IBM PC, is the original version and progenitor of the IBM PC compatible hardware platform. It is IBM model number 5150, and was introduced on August 12, 1981. It was created by a team of engineers and designers under the direction of Don Estridge of the IBM Entry Systems Division in Boca Raton, Florida.

Alongside "microcomputer" and "home computer", the term "personal computer" was already in use before 1981. It was used as early as 1972 to characterize Xerox PARC's Alto. However, because of the success of the IBM Personal Computer, the term PC came to mean more specifically a microcomputer compatible with IBM's PC product.

The 5150 system unit had only five expansion slots, and one was taken up by either a monochrome or colour display adapter. Almost all systems sold had at least one floppy drive, which required another slot for the controller card. Each serial and parallel port took up a further slot. The 5150's 63W power supply was slightly underrated for running contemporary hard drives. IBM's official solution to these problems was the 5161 Expansion Chassis.

The "IBM 5161 Expansion Chassis" came with one 10 MB hard disk and allowed the installation of a second hard disk. The system unit had five expansion slots, and the expansion unit had eight; however, one of the system unit's slots and one of the expansion unit's slots had to be occupied by the Extender Card and Receiver Card, respectively, which were needed to connect the expansion unit to the system unit and make the expansion unit's other slots available, for a total of 11 slots. A working configuration required that some of the slots be occupied by display, disk, and I/O adapters, as none of these were built in to the 5150's motherboard; the only motherboard external connectors were the keyboard and cassette ports. The simple PC speaker sound hardware was also on-board.

Our 5150/5161 system is complete with:

  • 5150 system unit, containing:
    • 64-256K Mainboard with revision three BIOS
    • 256K RAM
    • Winbond EGA video card
    • IBM floppy drive controller card
    • 5161 transmitter card
  • 5161 expansion unit, containing:
    • IBM monochrome display and printer port card
    • Sysgen Image external tape drive controller card
    • Multifunction card with serial, RTC, and RAM
    • 5161 receiver card
    • Original 63-way connector cable
  • 5151 monochrome monitor
  • Keyboard

Manufacturer: IBM
Date: 1981

Magazines RELATED to IBM 5161 in our Library

Item Manufacturer Date
REM 80 - Volume 11, Issue 1 The North West TRS-80 USers Group
Byte February 1988
Byte May 1987
Practical Computing - November 1982 November 1982
Personal Computer World - March 1983 March 1983
Dragon User - May 1983 May 1983
Personal Computer World - July 1983 July 1983
Practical Computing - August 1983 August 1983
Practical Computing - September 1983 September 1983
Practical Computing - October 1983 October 1983
Practical Computing - November 1983 November 1983
Perspective January 1984 Number 01 January 1984
Practical Computing - February 1984 February 1984
Personal Computer World - March 1984 March 1984
Perspective April 1984 Number 04 April 1984
Perspective June 1984 Number 06 June 1984
Byte August 1984 August 1984
Byte October 1984 October 1984
Practical Computing - October 1984 October 1984
Byte March 1984 October 1984
Personal Computer World - December 1984 December 1984
Practical Computing - December 1984 December 1984
Perspective December 1984 Number 12 December 1984
REM 80 - Volume 7, Issue 5 The North West TRS-80 USers Group 1985
Perspective April 1985 Number 04 April 1985
Practical Computing - July 1985 July 1985
University of Cambridge Computing Service Summer 1985 Newsletter 120 July 1985
Perspective July 1985 Number 07 July 1985
Personal Computer World Special: Business Computing The 1986 Survival Guide April 1986
Practical Computing - October 1986 October 1986
Perspective October 1986 October 1986
Perspective January 1987 January 1987
Byte April 1989 16-01-2003
Acorn User - September 1988 27-05-2009
Acorn User - January 1989 27-05-2009
Acorn User - February 1989 27-05-2009
Acorn User - March 1989 27-05-2009
Acorn User - November 1989 03-06-2009
Byte April 1987 09-09-2009
Byte October 1985 16-09-2009
Byte May 1985 16-09-2009
Byte June 1986 16-09-2009
Byte December 1986 16-09-2009
Byte August 1991 23-09-2009

Other Systems Related To IBM 5161:

Item Manufacturer Date
IBM 5150 with CGA Monitor IBM Unknown
IBM System 370 Control Panel IBM 1970
IBM 370/138 IBM 30th June 1976
IBM Displaywriter IBM 1980
IBM 5150 IBM 1st September 1981
IBM 5160 XT IBM 1st January 1983
IBM 5170 / PC AT IBM 1984
IBM 5155 Portable Computer IBM 1st June 1984
IBM 5140 Convertible Computer IBM April 1986
IBM PS/2 Model 70 IBM 1987
IBM PS/2 Model 30 286 IBM April 1987
IBM PS/2 Model 30 (FD/HD) IBM April 1987
IBM PS/2 Model 30 (Dual FD) IBM April 1987
IBM PS/2 Model 80 (8580-071) IBM 2nd April 1987
IBM PS/2 Model 55SX IBM October 1987
IBM PS/1 IBM 1990
IBM RS/6000 Model 550L IBM 1990
IBM Model 8573-121 IBM January 1990
IBM RS/6000 320 IBM 15th February 1990
IBM PS/2 Note IBM 1991
IBM PS/2 Model 95 (8595) IBM 1991
IBM ThinkPad 2523-710T IBM 1993
IBM RISC System/6000 250 IBM 1993
IBM ThinkPad 701CS IBM 1995
IBM ThinkPad 755CEX IBM March 1995
IBM RS/6000 SP2 Type 7025 IBM 1996
IBM ThinkPad 365XD IBM 1996
IBM RS/6000 Model 7043 604e IBM 1998
IBM 8363 NetVisa Thin Client IBM November 2000
IBM ThinkPad R30 2656 IBM 2001
IBM Thinkpad 2628-STG IBM 2001

This exhibit has a reference ID of CH21352. Please quote this reference ID in any communication with the Centre for Computing History.

 

IBM 5161

  Book Archive   [5]
  Software Archive   [6]
  Peripherals   [87]

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