CBM .prg Studio

A handy Commodore 8-bit program development utility for Windows


26th May 2024 - CBM prg Studio v4.3.0 released.

The biggest new feature in this release is pBASIC, which allows you to write BASIC (V2) programs without line numbers. Labels are used for jump destinations and are converted to line numbers when the program is generated.

Please note the warning about upgrading projects created in versions up to 4.2.0 still stands as I've had to kmake a couple of tweaks to the project explorer in this new version. Projects created in version 4.2.0 will not need upgrading to use the latest version. Enjoy!

Please see the download page for more details.

As usual, a huge thank you to OldSkoolCoder, Stuart Hurst and the wider Commodore community for their continued support with this project.

What Is It?

CBM prg Studio is a Windows IDE which allows you to type a BASIC or machine code program and convert it to a '.prg' file, which you can then run in an emulator or on real hardware. It also includes character, sprite and screen editors and a fully featured 6510/65816 debugger.

The following machines can be developed for:
  • Commodore 64 (and SuperCPU),
  • Commodore 128,
  • Commodore VIC 20,
  • Commodore 16,
  • Commodore Plus/4,
  • Commodore PET BASIC 2 machines, e.g. PET 2001,
  • Commodore PET BASIC 4 machines, e.g. PET 4000/9000,
  • Mega65,
  • Can also be used with the Kick Assembler.

Follow the download link for more details.


  • Kick Assembler support,
  • Mega65/BASIC65 support,
  • Git Integration,
  • 6502/6510/65816 Assembler/disassembler/Integrated Debugger,
  • Sprite editor,
  • Character editor,
  • Screen Designer,
  • SID tool,
  • A Screen Code Builder, for using those pesky print control characters,
  • Memory Viewer,
  • Binary file import/export,
  • Program import (.prg, .T64 or .D64/.D71/.D81),
  • Program export (.prg, .p00),
  • .D64/.D71/.D81 Creation Tool,
  • BASIC Constants,
  • Code formatting and renumbering,
  • Automatic assembly code formatting,
  • Multiple source files (assembly or BASIC) can be build to one destination,
  • Tabbed MDI interface,
  • Comprehensive help, including tutorials,
  • Plus many others.

Commodore Banner Exchange

To Do List

Here are some features which I'm either working on or planning to:
  • The next big feature update will be better support for KickAssembler and Mega65.
  • Bug fixes, as usual.
I'm open to suggestions if you have anything you would like adding to CBM Prg Studio, or change the way something works.


Way back in the mists of time I was given a VB.NET project at work. I'm a C++/C# programmer by trade and I hadn't touched VB since version 3 (many years ago) so I was a bit rusty to say the least. Typically, I wasn't given any investigation time and was expected to just get on with it. I'm sure any programmers out there are familiar with that! Anyway, I was scrabbling about looking for a nice little project I could do in my own time to get me up to speed with VB.NET and at the same time I was into playing around with the various C64 emulators and tools, particularly tok64. That's how C64prgGen (CBM prg Studio's predecessor) came about really as I noticed that there weren't many (if any) code generation tools with a GUI front end. Admittedly I hadn't looked very hard though. CBM prg Studio is the result of 'merging' C64 and VIC20 PrgGens.