Download Byte - July 1976 by Virginia Williamson PDF

By Virginia Williamson

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Sample text

The mnemonic LBA means that the contents of register A (the accumulator) is to be loaded into register B. The mnemonic LAB states that register B is to have its contents loaded into register A. It may be observed that this basic instruction has many variations. The machine language coding for this instruction is in the same format as the mnemonic code except that the letters used to represent the registers are replaced by numbers that the computer can use. Using octal code , the seven CPU registers are coded as follows: Register Register Register Register Register Register Register A= 0 B= 1 C= 2 D= 3 E= 4 H= 5 L=6 Also, since the machine can only utilize numbers, the octal number '3' in the most significant location of a word signifies that the computer is to perform a " load " operation .

This capabil ity provides a means for the computer to make "decisions" and to modify its operation as a function of the status of the various flags at the time that a program is being executed . In a manner simi lar to IMMEDIATE types of instructions, the JUMP instructions require more than one word of memory. A JUMP instruction requires three words to be properly defined. ) The JUMP instruction itself is the first word. The second word must contain the LOW ADDRESS portion of the address of the word in memory that the PROGRAM COUNTER is to be set to point to, which is the new location from which the next instruction is to be fetched.

ADD THE CONTENTS OF A MEMORY WORD TO THE ACCUMULATOR ADM 207 ADD THE CONTENTS OF A MEMORY WORD PLUS THE VALUE OF THE CAR RY FLAG TO THE ACCUMULATOR ACM 217 SUBTRACT IMMEDIATE CONTENTS OF OPF:RAND REGISTER 024 SUI 11001100 SUBTRACT WITH CARRY IMMEDIATE 034 SBI COMPARE IMMEDIATE 074 CPI LOGICAL INSTRUCTIONS WITH THE ACCUMULATOR There are several groups of instructions which allow BOOLEAN LOGIC operations to be performed between the contents of the CPU registers and the A (accumulator) register. In addition there are logic IMMEDIATE type instructions.

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