GE-400 series

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GE 400
Designer General Electric
Bits 24-bit
Introduced 1964
Design CISC
Type Register-Memory
Encoding Fixed
Branching Condition indicators
Compare and branch
6 index registers (in memory)
General purpose none
Floating point none

The GE-400 series were time-sharing Information Systems computers by General Electric introduced in 1964 and shipped until 1968.

System description[edit]

The GE-400 series came in three models: 415, 425, and 435. GE-400 systems had a word length of 24 bits which could contain binary data, four six-bit BCD characters, or four signed decimal digits. GE-400 systems could have up to 32,768 words (132K characters) of magnetic-core memory with a cycle time of 2.7 microseconds (435) or 5.1 microseconds (425). The systems supported up to eight channels for input/output.

The GE 412 was an incompatible computer system with a 20-bit word length intended for process control applications.[1]

Unique features[edit]

GE-400 systems featured a "variable length, relocatable accumulator"[2] which could be set programmatically to a length of one to four words and relocated to overlay any four adjacent locations in memory (modulo four). "The accumulator can be moved to the data to be processed, rather than moving the data."

Successor systems[edit]

The 400 series was succeeded by the incompatible 36-bit GE-600 series.

See also[edit]


  1. ^ General Electric Company. GE 412 Programming Manual (PDF). 
  2. ^ General Electric Company (1963). GE 425/435 Reference Manual (PDF). pp. 1–12: 1–13. 

External links[edit]