Author Archives: nowhereman999

CoCo fun

Hi All, This post was spurred on because I was replying to a comment today where someone was asking for my z80 to 6809 program and the link was dead.  I updated the link to the latest version I could … Continue reading

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Defender Conversion for the CoCo 3 – Part 6 – Three out of Three attract Screens are converted

Today I completed converting the Defender Arcade code to play through all three attract modes.  The last one was definitely the hardest as it contains the sprites moving around the screen.  I also had to convert how Defender draws the … Continue reading

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Defender Conversion for the CoCo 3 – Part 5 – Another cool 6809 coding trick they used

Hello, I just wanted to document this neat little trick here.  For changing the colour of one of the 16 stars on screen randomly in Defender they do the following: * Table of stars @ $AF9D to $AFDC * Format … Continue reading

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Defender Conversion for the CoCo 3 – Part 4 – Two out of Three Attract Screens are converted

I’ve been working hard on the Defender conversion and am happy with the progress and how well things are going.  I uploaded a video on YouTube showing that I now have two out of three attract screens working.  The code … Continue reading

Posted in CoCo Programming, Emulation | Tagged , , , , , , , | 3 Comments

Arcade Machine Conversion to the CoCo Overview

Hello, in a recent post I got a comment from username Perezernestoj who asked if I could convert Super Pac Man as my next game for the CoCo after I complete Defender.  I explained how much work this is and … Continue reading

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Defender Conversion for the CoCo 3 – Part 3 – Two more 6809 coding tricks they used

Below are a couple of coding tricks I’ve learned from Defender this week.  I thought I’d pass along the tricks for others to use, if they aren’t already. For simple loop counting, a nice fast way is to load an … Continue reading

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Defender Conversion for the CoCo 3 – Part 2 – Short and Sweet

Just a little blog entry to share a neat little bit of 6809 code. I’m really impressed with how well the 6809 is programmed in Defender.  I was decoding some of the Defender source code today and I came across … Continue reading

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Defender Conversion for the CoCo 3 – Part 1

Hello, I wasn’t going to blog about my conversion of the arcade version of the William’s classic game Defender for the Tandy Color Computer 3 but I decided it might be nice to share some of my progress.  Especially when … Continue reading

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MIDI 2 CoCo Converter

This is a program that converts MIDI files and outputs the converted music in one of three formats for the CoCo to playback.  It outputs the music data alone or along with the player for the given format.  The output … Continue reading

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How to setup and use IRQs on the TRS-80 Color Computer – Part 5 – Advanced interrupt settings and using CoCo 3 specific interrupts

Table of Contents (click on a link to jump to that web page) Part 1 – What is an IRQ and when would I use it? Part 2 – Overview with an example program Part 3 – Can my IRQ … Continue reading

Posted in CoCo Programming | 2 Comments