Data processing apparatus providing autoincrementing of memory p

Details Data processing apparatus providing autoincrementing of memory p Data processing apparatus providing autoincrementing of memory p

1978-12-29

1980-12-16

Zache, Raulfe B.

Boots, shoes, and leggings

G06F 932

Patent

active

042401429

ABSTRACT:
A Central Processing Unit (CPU) provides programmable autoincrementing of memory pointer registers. The CPU includes an op-code extension register (OER) to store a code specifying the autoincrementing status of each memory pointer register. Whether or not a particular memory pointer register containing the address of an operand used in the current operation is automatically incremented at the end of an instruction cycle to contain the address of an operand required for the next operation depends on the binary state of a particular bit position in the OER corresponding to the particular memory pointer register. The contents of the op-code extension register can be changed by means of an instruction for transferring a new code to OER.

REFERENCES:
patent: 3292151 (1966-12-01), Barnes et al.
patent: 3299261 (1967-01-01), Steigerwalt, Jr.364
patent: 3331056 (1967-07-01), Lethin et al.
patent: 3764988 (1973-10-01), Onishi
patent: 4037211 (1977-07-01), Ikuta
patent: 4095278 (1978-06-01), Kihara

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