The following Mic1 microcode excerpt shows support for a possible 7 bit opcode, 8 bit integer argument machine instruction (organized like the INSP instruction). This part of the microcode will be reached after the instruction opcode has been parsed and identified by earlier parts of the microcode and while the IR contains the complete instruction from memory (as usual for the IR). 100:a := band(smask, ir); 101:a := a + (-1); if n goto 0; 102:ac := rshift(ac); goto 101; What does this instruction do ? Left shift the AC places Right shift the AC places O Left circular shift the AC places Right circular shift the AC places Multiple the AC by 2^

The following Mic1 microcode excerpt shows support for a possible 7 bit opcode, 8 bit integer argument machine instruction (organized like the INSP instruction). This part of the microcode will be reached after the instruction opcode has been parsed and identified by earlier parts of the microcode and while the IR contains the complete instruction from memory (as usual for the IR). 100:a := band(smask, ir); 101:a := a + (-1); if n goto 0; 102:ac := rshift(ac); goto 101; What does this instruction do ? Left shift the AC places Right shift the AC places O Left circular shift the AC places Right circular shift the AC places Multiple the AC by 2^

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Computer Fundamentals

The computer is termed computation. For calculating or computing something the device that has been used is known as the computer. Or we can say that for performing a fast arithmetic operation the device that has been used is a computer. Storing, processing, and retrieving are the main features of a computer. 

Question

The following Mic1 microcode excerpt shows support for a possible 7 bit opcode, 8 bit integer argument machine instruction
(organized like the INSP <num> instruction). This part of the microcode will be reached after the instruction opcode has been
parsed and identified by earlier parts of the microcode and while the IR contains the complete instruction from memory (as usual
for the IR).
100:a := band(smask, ir);
101:a := a + (-1); if n goto 0;
102:ac := rshift(ac); goto 101;
What does this instruction do ?
Left shift the AC <num> places
Right shift the AC <num> places
Left circular shift the AC <num> places
Right circular shift the AC <num> places
Multiple the AC by 2^<num>

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