Write the symbolic microprogram routines for the BSA (branch and save address) instructions defined in Chap. 5 (Table 5-4). Use the microinstruction format of Sec. 7-3. Minimize the number of microinstructions.

Table 5-4

Symbol AND ADD LDA STA BUN BSA ISZ TABLE 5-4 Memory-Reference Instructions Operation decoder Do D D D D Do Symbolic description AC AC A M[AR] AC AC + M[AR], E-Cout AC M[AR] M[AR] AC PC AR M[AR] PC, PC+AR + 1 M[AR] M[AR] + 1, If M[AR] + 1 = 0 then PC-PC + 1