Data processing apparatus providing variable operand width opera

Details Data processing apparatus providing variable operand width opera Data processing apparatus providing variable operand width opera

1978-12-29

1981-03-24

Chapnick, Melvin B.

Boots, shoes, and leggings

G06F 934

Patent

active

042584191

ABSTRACT:
A Central Processing Unit provides programmable variation of the operand width for processor operations. The operands are formed with one or more N-bit segments. The CPU includes an arithmetic logic unit (ALU) which is adapted to operate serially on one N-bit segment of the operand at a time beginning with the least significant segment and repeating the operation on the remaining segments according to their order of significance. The number of repetitions of an ALU operation is controlled by a code stored in an op-code extension register (OER). The code in the OER can be changed by means of an instruction for transferring a new code to OER.

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MCS6500 Microcomputer Family Hardware Manual, MOS Technology, Inc., Norristown, PA, Jan. 1976, pp. 29-31.
MCS6500 Microcomputer Family Programming Manual, MOS Technology, Inc., Norristown, PA, Jan. 1976, pp. 23-30.

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