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Assembly Language Programming

Appendix C

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A Small Assembly Language Program

(a) An assembly language program. (b) The corresponding tracer display.

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The General Registers

The 8088 registers.

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Addressing (1)

Operand addressing modes. The symbol # indicates a numerical value or label.

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Addressing (2)

Operand addressing modes. The symbol # indicates a numerical value or label.

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The 8088 Instruction Set (1)

Some of the most important 8088 instructions.

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The 8088 Instruction Set (2)

Some of the most important 8088 instructions.

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The 8088 Instruction Set (3)

Some of the most important 8088 instructions.

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Conditional Jumps

Conditional jumps.

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Subroutine Calls

An example stack.

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System Calls and System Subroutines

Some UNIX system calls and subroutines available in the interpreter.

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The ACK-Based Assembler, as88 (1)

The as88 pseudoinstructions.

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The ACK-Based Assembler, as88 (2)

Some of the escapes allowed by as88.

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The Tracer

The tracer’s windows.

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Tracer Commands (1)

The tracer commands. Each command must be followed by a carriagereturn (the Enter key). An empty box indicates that just a carriage return is needed. Commands with no Address field listed above have no address. The # symbol represents an integer offset.

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Tracer Commands (2)

The tracer commands. Each command must be followed by a carriagereturn (the Enter key). An empty box indicates that just a carriage return is needed. Commands with no Address field listed above have no address. The # symbol represents an integer offset.

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Hello World Example

(a) HlloWrld.s.(b) The corresponding tracer window.

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General Registers Example

(a) Part of a program.

(b) The tracer register window after line 7 has been executed.

(c) The registers.

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Example Program (1)

The program vecprod.s.

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Example Program (2)

The program vecprod.s.

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Example Program (3)

The program vecprod.s.

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Example Program (4)

Execution of vecprod.s when it reaches line 28 for the first time.

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Example Program arrayprt

The program arrayprt before debugging.

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Example Program strngcpy.s

Copy a string.

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Example Program reverspr.s

Print a string backwards.

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Dispatch Tables (1)

A program demonstrating a multiway branch using a dispatch table.

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Dispatch Tables (2)

A program demonstrating a multiway branch using a dispatch table.

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Dispatch Tables (3)

A program demonstrating a multiway branch using a dispatch table.

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Buffered and Random File Access (1)

A program with buffered read and random file access.

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Buffered and Random File Access (2)

A program with buffered read and random file access.

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Buffered and Random File Access (3)

A program with buffered read and random file access.