1. The following program is stored in the memory unit of the basic computer. Sho

Question

1. The following program is stored in the memory unit of the basic computer.

Show the contents of the AC, PC, and lR (in hexadecimal), at the end, after each instruction is executed. All numbers listed below are in hexadecimal.

Location        Instruction

010                             CLA

011                             ADD 016

Oil                              BUN 014

013                             HLT

014                             AND 017

Ol5                             BUN 013

016                             C1A5

017                             93C6

2. An instruction at address 021 in the basic computer has I = 0, an operation code of the AND instruction, and an address part equal to 083 (all numbers are in hexadecimal). The memory word at address 083 contains the operand B8F2 and the content of AC is A937. Go over the instruction cycle and determine the contents of the following registers at the end of the execute phase: PC, AR, DR, AC, and lR. Repeat the problem six more times starting with an operation code of another memory-reference instruction.

Explanation / Answer

2.

Instruction PC AR DR AC IR

Initial 021 - - A937 -

AND 022 083 B8F2 A832 0083

ADD 022 083 B8F2 6229 1083

LDA 022 083 B8F2 B8F2 2083

STA 022 083 - A937 3083

BUN 083 083 - A937 4083

BSA 084 084 - A937 5083

ISZ 022 083 B8F3 A937 6083

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