| 摘要 |
PURPOSE:To reduce the capacity of a control storage and to reduce the number of steps by providing the titiled circuit with the control storage, an instruction register, a current address register, and an adder. CONSTITUTION:A microinstruction to be executed is read out from the control storage 1 and stored in an instruction register 2, and simultaneously the address of the microinstruction stored in the register 2 is stored in a current address register 4. When the microinstruction in the register 2 is executed, a constant generating circuit 3 for setting the gneeratng constant to ''1'' and ''2'' is excited. At te storage of a new instruction, an increment type instruction sets up INZ instead of INC and the circuit 3 and a selecting circuit 6 are controlled by the field. Namely, the circuit 3 outputs ''1'' by INC and ''2'' by INZ. The curcuit 6 selects an adder 5 in the fields of INC and INZ and an address element 7 in other fields.
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