Write a symbolic microprogram routine for the ISZ (increment and skip if zero) instruction defined in Chap.

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Write a symbolic microprogram routine for the ISZ (increment and skip if zero) instruction defined in Chap. 5 (Table 5-4). Use the microinstruction format of Sec. 7-3. Note that DR = 0 status condition is not available in the CD field of the computer defined in Sec. 7-3. However, you can exchange AC and DR and check if AC =0 with the Z bit.

Table 5-4

Symbol AND ADD LDA STA BUN BSA ISZ TABLE 5-4 Memory-Reference Instructions Operation decoder Do D D6 Symbolic

7-3 Microprogram Example Once the configuration of a computer and its microprogrammed control unit is

111 10 10 SBR MUX AR PC 0 CAR Control memory 128 x 20 Control unit Address 15 15 Memory 2048 x 16 MUX DR

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