HP 2100
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Hewlett-Packard's first computer, the 2116A of the HP-2100 series, was developed in the late 1960s. It is a 16-bit word-addressed general purpose computer. Main memory is 4096 words (4K), expandable to 32K magnetic core. The memory cycle time is 1.6 microseconds.
There are two 16-bit accumulators, called A and B. There are two 1-bit flags, called Overflow and Extend. The program counter, 15 bits, is called P. All instructions in the standard instruction set are 16 bits long. Conditional branching is done with a conditional skip followed by a jump instruction.
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Instruction overview
- Arithmetic – Add, Increment, And, Or, Exclusive or
- Program Control – Skip, Jump, Jump to Subroutine
- Shift/Rotate – Arithmetic and Logical Shifts, 16- and 17-bit Rotates
- Optional – Multiply, Divide, 32-bit Load and Store, 32-bit Shifts
Model overview
Early models (1966-1969)
Core memory, hardwired CPU. Essentially a PDP-8 that has been pumped up to 16 bits and two accumulators.
- 2116A
- 2116B
- 2116C
- 2115A
- 2114A
- 2114B
Second generation (1970-1974)
Core memory, microprogrammed CPU. An option allowed user microprogramming.
- 2100A
- 2100S
21MX (1975-????)
Semiconductor memory, expandable to 1,048,576 words (one megaword).
- M-series – 2105A, 2108A, 2112A
- E-series – 2109A, 2113A
- F-series – 2111F, 2117F
Introduction dates
According to the alt.folklore.computers (news:alt.folklore.computers) Big List the early computers were introduced at the following times:
- Hewlett-Packard 2116A – Nov 1966
- HP 2115A – Nov 1967
- HP 2116A – Sep 1968
- HP 2114A – Oct 1968
- HP 2000A – Nov 1968
- HP 2114B – Nov 1969
(Note the conflicting entries for the 2116A, also the presence of the 2000A which is a time sharing system and not an actual computer as such.)
References
- Moffatt, Jeff (1999). HP 2100 Hardware Info. (http://oscar.taurus.com/~jeff/2100/)