Commodore CBM-II Games

by romhoard-research · 2026/02/14

The Commodore CBM-II was a series of business-oriented computers released by Commodore Business Machines starting in 1982. The most popular models were the Commodore 610, 620, 710, and 720 (known as B128, B256, B128-80, and B256-80 in North America). These machines featured a MOS Technology 6509 processor capable of addressing up to 1MB of RAM via bank switching, 128KB-256KB RAM, a MOS 6581 SID chip (same as Commodore 64, but overclocked to 2 MHz), and 80-column monochrome text-only display. Unlike the hugely successful Commodore 64, the CBM-II was designed for business use and had severe technical limitations for gaming: no ability to define custom character sets, no color graphics capability, text-only 80x25 display, and limited to character-based pseudo-graphics at 160x50 PETSCII resolution. These constraints made the CBM-II a challenging platform for game developers and resulted in a minimal commercial game library.

14 games

pet cbm2

System

Genre

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Space Chase

Commodore CBM-II

Modern homebrew (2018-2020). The only modern game fully utilizing the CBM-II's SID sound chip and technical capabilities. Space Chase uses 160x50 PETSCII graphics, assembler code, and the full 2 MHz processor speed. The game features split-screen multiplayer and full SID music composition.

3D Star Trek

Commodore PET

Early tactical space combat game with damage reports, sensor scans, and photon torpedo targeting. Available on 3000-series and 4000-series PETs with limited compatibility with CBM-II.

Flight Simulator

Commodore PET

Simulation Vehicle

Pioneering text-based aircraft flight simulator with take-off and in-flight scenarios. Released in 1980 for PET/CBM.

Labyrinth

Commodore PET

First-person maze adventure with procedurally generated mazes featuring top-down preview mode and first-person navigation. Released in 1983 for PET/CBM.

Lunar Lander

Commodore PET

Simulation Vehicle

Space flight simulation featuring animation effects including thrust visualization and planetary landing scenarios across the solar system. Released in 1980 for PET/CBM.

Hangman

Commodore PET

Word puzzle game with multiple variants featuring difficulty levels and word set options. Released in 1980 for PET/CBM.

Space Invaders

Commodore PET

Early text-based adaptation of the classic arcade game for PET platform.

Aliens!

Commodore PET

Space Invaders-style shooter for PET platform.

Super Glooper

Commodore PET

Pac-Man port described as "Excellent Pac-Man port for 40-column PETs."

Arrow

Commodore PET

Snake variant where player controls a snake with variable length in 60-second rounds.

Petchess 4000

Commodore PET

Large 32KB chess program for the PET/CBM platform.

Checkers

Commodore PET

BASIC implementation of the classic checkers game.

Pong

Commodore PET

Small paddle pong implementation for the PET.

Breakthrough

Commodore PET

Classic paddle game variant with sound effects.