Commodore 64 Dev Environment

This Repl provides a starting point from which you can develop programs for a Commodore 64. You can test using the VICE emulator.

Makefile

A basic Makefile is provided that compiles asmprog.s into asmprog.prg and cprog.c into cprog.prg. Additional steps in the Makefile turn these into a loadable disk image.

make run will run VICE with the built disk image attached as device 8.

C Programs

cprog.c uses printf to write some text to the screen.

ASM Programs

asmprog.s directly increments video registers to change colors on the screen.

BASIC Programs

basicprog.bas writes some text to the screen.

How to Run

Once VICE loads, at the BASIC prompt:

LOAD "ASMPROG",8

Once the program loads, you can type:

RUN

to run the program.

To load the C program, replace the first LOAD with this:

LOAD "CPROG",8

Writing BASIC

You can also type your BASIC programs directly into the emulator, for example:

10 PRINT "HELLO WORLD"
20 GOTO 10
RUN

Hit the Escape key to stop the program running.

Saving and Loading Programs

Once you have written a BASIC program in the emulator, you may want to save it.

The myprogs.d64 disk is loaded as drive 9 in the emulator for this purpose.

Let's take this BASIC program:

10 PRINT "HELLO WORLD"
RUN

It'll print HELLO WORLD to the screen.

To save,

SAVE "HELLO",9

Once saved, you can load the program again after a restart:

LOAD "HELLO",9
LIST
RUN