Programming with Ophis

Michael Martin

Copyright © 2006-2024 Michael Martin

Table of Contents

History of the project
Getting a copy of Ophis
About the examples

I. Using the Ophis Assembler

A note on numeric notation
Producing Commodore 64 programs
Related commands and options
Writing the actual code
Assembling the code

Labels and aliases

Temporary labels
Anonymous labels
Aliasing

Headers, Libraries, and Macros

Header files and libraries
Macros
Example code

Character maps

Local variables and memory segments

Expressions

Advanced Memory Segments

The Problem
The Solution

Included Platform Support

The Commodore 64 and VIC-20
The Nintendo Entertainment System
The Atari 2600 VCS
Other Atari 8-bits
The Apple II series

II. To HLL and Back

The Second Step

The problem
The solution
Unsigned arithmetic
16-bit addition and subtraction
16-bit comparisons

Structured Programming

Control constructs
The stack
Procedures and register saving
Variables
Data structures
A modest example: Insertion sort on linked lists

Pointers and Indirection

The absolute basics
Pointer arithmetic
What about Indexed Indirect?
Comparison with the other indexed forms
Conclusion

Functionals

Function Pointers
A quick digression on how subroutines work
Dispatch-on-type and Data-Directed Assembler
VTables and Object-Oriented Assembler
A final reminder

Call Stacks

Recursion
Our Goals
Example: Fibonnacci Numbers

Example Programs

hello1.oph
hello2.oph
c64-1.oph
c64kernal.oph
hello3.oph
hello4a.oph
hello4b.oph
hello4c.oph
hello5.oph
hello6.oph
hello7.oph
structuredemo.oph
fibonacci.oph

Ophis Command Reference

Command Modes

Basic arguments

Numeric types
Label types
String types

Compound Arguments

Memory Model

Basic PC tracking
Basic Segmentation simulation
General Segmentation Simulation

Defining Macros
Invoking Macros
Passing Arguments to Macros
Features and Restrictions of the Ophis Macro Model

Assembler directives

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