Communications: electrical – Digital comparator systems
Patent
1974-12-13
1976-05-25
Hecker, Stuart N.
Communications: electrical
Digital comparator systems
3401725, 340173R, G11C 2900, G11C 800
Patent
active
039597830
ABSTRACT:
An addressing device is described for a control store comprised of a read-only storage portion and a read-write storage portion, each divided in addressable microprogram sectors and both accessible through a common address register and accessing to a common read-out register. Said control store is a part of a multimicroprogrammed unit further comprising a logical unit, a status register for said logical unit and an automatic store address forming organization operating on data supplied from the common read-out register and the logical unit. When a microprogram stored in a sector of the read-write storage portion must be substituted for a microprogram stored in a sector of the read-only storage portion, the logical unit forces into the status register, a pointer code and the sector addresses of the concerned read-only and read-write storage portions. The pointer code validates comparing means of the sector address code of the read-only storage portion of said status register and the sector address code outputting said organization and the identity output signal from the comparing means, controls substitution in the common address register of the read-write code of the status register for the sector address code outputting said organization.
REFERENCES:
patent: 3422402 (1969-01-01), Sakalay
patent: 3588830 (1971-06-01), Duda et al.
patent: 3659275 (1972-04-01), Marshall
patent: 3755791 (1973-08-01), Arzubi
Fressineau Jean-Louis
Hoffmann Pierre
Hubert Maurice
Compagnie Internationale pour l'Informatique
Hecker Stuart N.
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