
Articles by Glen's Weblog



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 → …

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 → …

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 → …

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 → …

Arcade Machine Conversion to the CoCo Overview
Hello, in a recent in 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 … Continue reading → …

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 → …

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 → …

Defender Conversion for the CoCo 3 – Part 1
Hello, I wasn’t going to blog about my Defender conversion for the CoCo 3 but I decided it might be nice to share some of my progress. Especially when there is something to see. I made a video showing the … Continue reading → …