Computer Systems


Early 2000 Selection:

Name: 2100A
Product Number: 2100A
Introduced: 1971
Division: Cupertino
Ad: Click to see, Click to see
Original Price: Unknown
Catalog Reference: 1972, page 399
Donated by: Paul Schroeter, HP Australia.


The 2100A replaced the 2116, 2115 and 2114 in 1971. The 2100A was compatible with the earlier computers and used the same I/O boards. It was the industry's first microprogrammable minicomputer.

The 2100A included an integrated power supply and came with 14 I/O channels within the mainframe (externally expandable to 45 channels). The power supply was auto-switching between 115V and 230V (the first in a minicomputer).

Like the 211X computers that it superceded, the 2100A used magnetic core memory. It came standard with 4K words of memory, upgradable within the mainframe to 32K words. Other new features introduced by the 2100A included: memory protect, dual channel DMA and an optional hardware floating point processor.

Main boards for the 2100A:

A1: 02100-60014
A2: 02100-60002
A3: 02100-60004
A4: 02100-60022
A5: 02100-60001
A6: 02100-60003
A7: 02100-60024
A8: 02100-60007
A9: 12895-60001
SSA: 5060-8331
XYD: 02100-60012
DC: 02100-60011
IDL: 02100-60010
ID(16K): 02100-60009

Over 8,000 units of 2100A and 2100S computers were sold by the time the machines were obsoleted in April of 1978.

Click here to view a 13 second historic video of the 2100A in action at Monash University along with the 7260A card reader and 2615A terminal ( file size 2.2 Mb). Original footage taken by Professor J.L. Keedy, provided with the permission of Professor John Rosenberg, Deakin University.

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