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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

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.

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In a multi-microprogrammed unit comprising a control store having a read-only storage portion and a read-write storage portion, each portion organized in addressable microprogram sectors, and having a common address register and a common read-out register for said storage portions, a logical unit ha

In a multi-microprogrammed unit comprising a control store having a read-only storage portion and a read-write storage portion, each portion organized in addressable microprogram sectors, and having a common address register and a common read-out register for said storage portions, a logical unit having a control input connected to an output of the read-out register, a status register controlled from said logical unit, and a control store address forming organization having control and data inputs from outputs of the read-out register and of the logical unit and having an output to said common address register, an addressing device comprising the combination of: means controlled from the logical unit for writing into said status register a pointer code, a read-only storage sector address code and a read-write storage sEctor address code when, during execution of a task by the multi-microprogrammed unit, a microprogram in this addressed sector of the read-write storage portion must be substituted to a microprogram in this addressed sector of the read-only storage portion of the control store, means having an authorization input controlled by the said pointer code for comparing the sector address code in the address code outputting said organization to the read-only sector address code in said status register, and, means responsive to an identity condition output of said comparator means for substituting in the outputting code from said organization the read-write storage sector code of said status register to the read-only storage sector code in said outputting code for the said common address register.