Simoco

Simoco is a memory game  based on Simon from MB Games. It was written not so much for it's play value, (it is 100% functional though) but so that it's source code could be made available as a learning tool to help with 6809 assembly for the Tandy colour and Dragon 8 bit computers.

The zip file below contains the source code for both the Colour computer and Dragon versions of the game and has been heavily commented to try to (as best as I can) explain how everything works. It covers Setting up the semigfx 8 screen mode, drawing graphics on screen, simple sound, keyboard input using both ROM calls and reading directly from the PIA, creation of an animated title screen and setting the screen mode for displaying on screen text, as well as all the game logic, memory setup, psudo random pattern selection, compares, branches etc. 

I had intended to make a video series on 6809 assembly and wrote this game as a companion piece to accompany it. However due to a lack of time (at the moment) and the fact that the subject is a lot more difficult to explain that I had thought I decided to put the videos on hold but make the Simoco game and code available in the hopes that it may be helpful to someone.