Question: Suppose that we change the ADD routine listed in Table 7-2 to the following two microinstructions. ADD: READ I CALL

Suppose that we change the ADD routine listed in Table 7-2 to the following two microinstructions.

ADD: READ I CALL INDR2

ADD U JMP FETCH

What should be subroutine INDR2?

Table 7-2

Label ADD: BRANCH: OVER: STORE: EXCHANGE: FETCH: TABLE 7-2 Symbolic Microprogram (Partial) Microoperations CD BR ORG 0 NOP READ ADD INDRCT: ORG 4 NOP NOP NOP ARTPC ORG 8 NOP ACTDR WRITE ORG 12 NOP READ ACTDR, DRTAC WRITE ORG 64 PCTAR READ, INCPC DRTAR READ DRTAR CUI S U I U LUU I I U U U CALL JMP JMP JMP JMP CALL JMP CALL JMP JMP CALL JMP JMP JMP JMP JMP MAP JMP RET AD INDRCT NEXT FETCH OVER FETCH INDRCT FETCH INDRCT NEXT FETCH INDRCT NEXT NEXT FETCH NEXT NEXT NEXT

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