Communications: electrical – Digital comparator systems
Patent
1975-04-14
1977-05-17
Nusbaum, Mark E.
Communications: electrical
Digital comparator systems
G06F 1100
Patent
active
040245071
ABSTRACT:
In a system for monitoring groups of memory locations in the working memory of a computer equipped with a central processing unit, each location having a capacity of n binary bits, in order to effect automatic location of a group of successive empty locations, which group has a length L at least equal to that required by an interrogating program, and to return a group of memory locations whose contents are no longer required to an unoccupied state and combine such group with following unoccupied groups, there are provided: a memory state register and a base address status register each having a plurality of stages, with each stage corresponding to a respective working memory location and being in one binary state when its corresponding memory location is occupied and in the opposite binary state when its corresponding memory location is empty; an arithmeticlogic function unit including an adder circuit and an indicator circuit connected to the registers for locating a group of successive empty working memory locations by determining the binary states of blocks of adjacent stages of each of the registers; a first group of status flip-flops divided into two blocks, a first one of the blocks being connected to be interrogated by the central processing unit; and a control mechanism connected to the registers, the function unit and the status flip-flops and arranged to interrogate the second one of the blocks of flip-flops, the mechanism being arranged to selectively process the contents of the registers according to one of a selected plurality of modes or to go through a waiting loop in dependence of the states of the flip-flops, and to emit control signals determining the mode according to which the contents of the registers are to be processed.
REFERENCES:
patent: 3670309 (1972-06-01), Amdahl et al.
patent: 3680055 (1972-07-01), Wilson et al.
patent: 3810109 (1974-05-01), Morris et al.
patent: 3878513 (1975-04-01), Werner
Berkling Klaus
Kluge Werner
Gesellschaft fur Mathematik und Datenverarbeitung mbH Bonn
Nusbaum Mark E.
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