System for packing page frames with segments

Details System for packing page frames with segments System for packing page frames with segments

1973-12-03

1976-03-02

Thesz, Jr., Joseph M.

Communications: electrical

Digital comparator systems

G06F 1300

Patent

active

039421554

ABSTRACT:
Provides apparatus for partitioning page frame hardware components of a main store into four partitions. The apparatus can pack small fixed size segments into each of the four partitions and can pack the first part of a large segment, or a varying-size segment into the last partition of a page frame. Hardware is disclosed for executing a create segment instruction which will pack its created segment into the same page frame with a specified existing segment. The apparatus also generates and updates a header for any page frame which is to contain a plurality of segments. The embodiment comprises comparators, registers, and their connecting gating hardware for generating the electrical signals which create the segments and page frame headers.
Other hardware modifies each address in order for it to access a required partition with a selected page frame. Still other apparatus checks the upper bound of a partition containing the pertinent segment to determine that the address will not access into the next partition in the page frame, prior to the address accessing of main store. An error condition is generated if the address exceeds its segment's partition.

REFERENCES:
patent: 3412382 (1968-11-01), Couleur et al.
patent: 3425039 (1969-01-01), Bahrs et al.
patent: 3510847 (1970-05-01), Carlson et al.
patent: 3614746 (1971-10-01), Klinkhamer
patent: 3764996 (1973-10-01), Ross

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