Category Archives: Uncategorized

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 019 – You can try it, if you want…

Hello, First things first, just so I don’t get anyone telling me.  At this point Pac Man is slow about 1/3rd the speed of the original arcade machine.  The cutscenes need to be fixed and there is no sound…  Other … Continue reading

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Zilog z80 to Motorola 6809 Transcode – Part 017 – Ready Player 1

Just a little update on my progress.  Things are looking pretty good.  I now have all the main game routines coded and I’ve added the buttons to insert a coin, select 1 or 2 player game and control Pac Man … Continue reading

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CoCo 3 Loader for big programs

While working on the Pac Man transcode I was feeling a little cramped for space since the CoCo 3 has 64k of addressable space for the 6809 but loading a program that wont fit in memory between $E00 to $7FFF … Continue reading

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Zilog z80 to Motorola 6809 Transcode – Part 015 – Sprites on the Demo Maze

Not much to report, just adding more routines… I got as far in the attract mode as the first scene finished (where Pac man eats the power pill and the Dark Blue ghosts) then the maze is drawn and Pac … Continue reading

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Zilog z80 to Motorola 6809 Transcode – Part 006 – VideoRAM layout and Sprite engine

After many many hours of work I finally have a screen that can show this… That is just a test of my Pac Man character display routine.  It isn’t from the actual z80 code but the screen pointer is the … Continue reading

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XBMC Live install with working NVidia (GT240) HDMI audio

I fought with XBMC Live yesterday for half a day trying to get Audio out of the HDMI port on my GT240 NVidia graphics card.  It turns out it is very simple, I was fighting with it for nothing, I … Continue reading

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