GE-400 series

GE 400
Registers
Designer	General Electric
Bits	24-bit
Introduced	1964
Design	CISC
Type	Register-Memory Memory-Memory
Encoding	Fixed
Branching	Condition indicators Compare and branch
Accumulator 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

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, 4 6-bit BCD characters, or 4 signed decimal digits. GE-400 systems could have up to 32768 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

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

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

References

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

External links

General Electric

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²Sold or spun off

Category
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