Use of read only memory in ILLIAC IV

Authors:
H. J. White;E. K. C. Yu
Affiliations:
Burroughs Corporation, Paoli, Pennsylvania;Burroughs Corporation, Paoli, Pennsylvania
Venue:
AFIPS '70 (Spring) Proceedings of the May 5-7, 1970, spring joint computer conference
Year:
1970

Citing 2
Cited 1

The ILLIAC IV Processing Element

IEEE Transactions on Computers
The ILLIAC IV Computer

IEEE Transactions on Computers

Readings in microprogramming

IBM Systems Journal

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Abstract

Because of its high speed operation, large instruction repertoire and centralized control, the ILLIAC IV Computer uses a Read Only Memory (ROM) to translate instructions into control enables. These control signals are broadcast to the array of parallel processors to control the step by step operation of each processor. Each of the over 260 instructions is decoded into a microsequence (microprogram) used to address the ROM. Each microsequence consists of from one to 69 microsteps (microinstructions).