img352
0: mar<-pc;rd; / start of rnain loop
1: pc<-pc+l;rd; /increment PC, uait for memory
2: ir<-rnbr;if n then goto 0; / transfer instr. to IR, decode top
bit. NB to get frorn MBR to IR it passes through ALU; n is equivalent to top bit (sign bit).
3: tir<-lshift(ir+ir) ; if n then goto 19; /test bit 14,
IR shifted left TWICE into TIR 4: tir<-lshift(tir) ; if n then goto 11; /test bit 13 5: alu<-tir; if n then goto 9; /test bit 12
/LODD instruction 6: mar<-ir;rd;
7: rd; /wait for memory
8: ac<-mbr; goto 0; /LODD completed
/STOD
9: mar<-ir;mbr<-ac;vr; 10:ur; goto 0;
11 :alu<-tir;if n then goto 15; /0010=addd or 0011 = subd?
/ADDD
/get 2nd. operand from memory
12:mar<-ir;rd;
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