Computer for directly executing a program including a plurality

Details Computer for directly executing a program including a plurality Computer for directly executing a program including a plurality

1978-06-26

1980-12-16

Springborn, Harvey E.

Boots, shoes, and leggings

364900, G06F 940

Patent

active

042401372

ABSTRACT:
A computer which executes a program made up of a plurality of blocks comprises a program counter which designates an address of an instruction to be executed, first and second registers that stores entry addresses of first and second blocks respectively of the program, and a push down stack that stores an entry address of a third block of the program. The instruction designated by the program counter causes the reading out of data from a main memory device so as to read out the contents of one of the first, second or third blocks of the program from the main memory device for execution. The designated instruction causes the reading of one of the entry addresses stored in the first and second registers or the push down stack so as to load such entry address into the program counter to cause the readout of the program block. The entry address stored in the push down stack is selectively discarded when it is indicated to be of no future use by an instruction in the program portion contained in the said block that is being executed.

REFERENCES:
patent: 3614740 (1971-10-01), Delagi et al.
patent: 3614741 (1971-10-01), McFarland et al.
patent: 3646522 (1972-02-01), Furman et al.
patent: 3735363 (1973-05-01), Beers et al.
patent: 3938098 (1976-10-01), Garlic
patent: 4050058 (1977-09-01), Garlic
J. R. Mick, "Microprogramming a Bipolar Microprocessor", Advanced Micro Devices, Inc., Microprogramming Handbook, 1976, pp. 1-1 thru 1-7.
"Preliminary Data", AM 2930 Program Control Unit Advanced Micro Devices, Bipolar Microprocessor Circuits, Catalogue Advanced Micro Devices Inc, 2/77.
Herman-Giddens et al., "BIOMAC:Block Structured Programming Using PDP-11 Assembler Language", Software-Practice and Experience, vol. 5, 359-374, 1975.

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