Monthly Archives: February 2017

Zilog z80 to Motorola 6809 Transcode – Part 018 – Transcode is complete and a look at level 256

Posted on February 26, 2017 by nowhereman999

Hello again, I’ve transcoded all the Pac Man z80 code to the 6809 now, except for some audio related code which isn’t going to be used on the CoCo 3.  The game plays properly now.  The demo mode ghost movement … Continue reading →

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

Posted on February 20, 2017 by nowhereman999

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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Zilog z80 to Motorola 6809 Transcode – Part 016 – Attract modes are done

Posted on February 17, 2017 by nowhereman999

Just a little update to say that I’ve made some great progress on the Pac Man code, it runs through both game attract modes properly and loops endlessly, looking for someone to put a quarter in the machine. I found … Continue reading →

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CoCo 3 Loader for big programs

Posted on February 15, 2017 by nowhereman999

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

Posted on February 5, 2017 by nowhereman999

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 014 – MAME -debug and how fast is the code

Posted on February 3, 2017 by nowhereman999

Hi All, I thought I’d talk a little bit about one of the most powerful tools to use while transcoding, and that tool is MAME.  Specifically MAME using the -debug feature.  With the debug feature turned on you can do … Continue reading →

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