Author Archives: nowhereman999

How to make PMODE 4 CSM video files for the CoCo (TRS-80 Color Computer)

Hi All, Using some awesome free tools a bash script and a little C program I wrote it’s possible to make PMODE 4 colour videos that playback at 23.3 fps with sound and have four colours – black, white,  and … Continue reading

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Zilog z80 to Motorola 6809 Transcode – Part 025 – My z80 to 6809 program

To end this series on transcoding the z80 code to the 6809 I thought I should include my c program called z80_to_6809_15_Pacman.c it is what I used to help with the transcode.  It takes a z80 disassembly as input and … Continue reading

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Zilog z80 to Motorola 6809 Transcode – Part 024 – PAC MAN is finally complete, if you have a CoCo 3 with 512k give it a try…

Hello, well I’ve finally completed my translation from the z80 arcade version of PAC MAN to the 6809 for the CoCo 3.  If you want to play it download version 1.01 here (Update – this version no longer includes any executable … Continue reading

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CoCo (6809) Assembly on a modern computer

This article is a guide for anyone who is thinking about learning 6809 assembly language programming or wants to use newer tools for doing 6809 assembly for the Tandy Color Computer.  It’s not an assembly tutorial, it’s an explanation of … Continue reading

Posted in CoCo Programming, Emulation | 2 Comments

Zilog z80 to Motorola 6809 Transcode – Part 023 – Optimized sprite rendering, combining Compiled sprites with Stack Blasting

Talking with other CoCo users about optimizing the sprite rendering on the CoCo I’ve figured out the best way to render the sprites for Pac Man on the CoCo3.  This article will summarize what I’ve learned and then explain what … Continue reading

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Zilog z80 to Motorola 6809 Transcode – Part 022 – Quick and dirty Speed Test – Five Sprites and 2 audio samples at the same time

I decided to put the Pac Man Sprite code and audio code together and see how fast the Pac Man transcode could be drawing five compiled sprites and playing back two separate audio samples at the same time.  There’s still … Continue reading

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Zilog z80 to Motorola 6809 Transcode – Part 021 – Compiled Sprites are faster then Stack blasting!

Hello, after writing previous blogs on how great stack blasting is, I’ve recently found out about an even faster sprite rendering method called Compiled Sprites.  A few weeks ago I was watching a CoCo youtube video and just briefly they … Continue reading

Posted in CoCo Programming | 4 Comments