Galaxian500

About

Galaxian is Namco's classic arcade shoot-'em-up, credited in this project's credits simply as "the original game." Galaxian500 is a beta transcode of the original Z80 arcade code to 68K assembly, targeting both the Commodore Amiga and Neo Geo (MVS and NGCD). The Z80-to-68K transcode itself is reported complete and bug-free, and the game is playable with sound on both Amiga and Neo Geo hardware.

How it differs from the original

The Neo Geo release's code and assets were converted from the original arcade data rather than built from scratch, following separately credited Z80 reverse-engineering work.

Getting started

Press fire or the 5 key to insert a coin from the menu, up or 1 to start a one-player game, down or 1 for a two-player game, and the third button or P key to pause.

Known issues & limitations

• graphics: Neo Geo version has incomplete display masking at top and bottom.
• audio: Neo Geo version has partial sound with glitches; TBD for full implementation.

Status & roadmap

• The project is marked as beta software at the time of writing.