Boots – shoes – and leggings
Patent
1978-12-29
1981-10-06
Shaw, Gareth D.
Boots, shoes, and leggings
G06F 1300
Patent
active
042939070
ABSTRACT:
A Central Processing Unit (CPU) includes a hardware op-code extending register (OER) for storing a code for programmable selection of optional CPU features which modify processor operations defined by the op-code in each instruction. A control section in the CPU decodes both the op-code of a current instruction and the code in the OER, effectively combining the two to form an extended op-code capable of defining a larger set of processor operations than the op-code carried in each instruction. The code in the OER is changed only when the CPU executes an instruction for transferring a new code into OER. Thus the code in OER can remain stationary over many instruction cycles.
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MOS Technology, Inc., MCS6500 Microcomputer Family Hardware Manual, 1976.
J. Dirac, Call Instruction, May 1966, IBM Tech. Disc. Bull., vol. 8, No. 12, p. 1751.
Huang Victor K.
Ruth Richard L.
Bell Telephone Laboratories Incorporated
Eng David Y.
Shaw Gareth D.
Torsiglieri Arthur J.
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