Articles by Glen's Weblog

Last week on the CoCo discord assembly channel Simon Jonassen posted some code to draw and animate 128 pixels that drew a radar or fan blade type animation on the CoCo 3 screen using some very optimized 6809 assembly code. … Continue reading → …

I’ve been asked for an update on the progress of Robotron and since I made some excellent progress today I thought I’d make a video and show it on YouTube. I’ve got most of the sprites converted to compiled sprites … Continue reading → …

A few different options for drawing a line down the screen on a 320×225 16 colour screen. Let’s start where A has the byte we want to draw down the screen, B is the height and X is the screen … Continue reading → …

Tim Lindner just published an excellent YouTube video that shows some more advanced 6809 assembly routines. He’s going to post more in the future so you might want to subscribe if this stuff interests you. One cool thing he showed … Continue reading → …

I was going through some more code for Rotation today and I’m starting to work on the attract screen where it shows each letter of the big ROBOTRON logo drawn form a backwards explosion. This explosion effect is drawn from … Continue reading → …

I started working on converting Williams classic arcade game Robotron to the CoCo 3 a few weeks ago. Have the source code is incredibly helpful. I arranged all the source code into a format that LWASM could assemble in place … Continue reading → …

I finally finished converting Williams Defender to work on the CoCo 3. It’s been years since I started the conversion and I’m glad to say it’s finally done. You can watch me load and play it a little in the … Continue reading → …

I thought I’d share some of the cool features I’ve discovered over the years using LWASM that I don’t think are widely known or maybe I just live under a rock. 🙂 One of the best things are the need … Continue reading → …

Since I finished Joust so I thought I’d go back and look at Defender with fresh eyes and start from scratch. I now know the Williams hardware very well and know what kinds of things in my conversion can kill … Continue reading → …

I finished my conversion of Joust for the CoCo 3 and it’s ready to be downloaded and played I included some BASIC programs on the disk image, these three programs allow you to either: -Save the High Scores and other … Continue reading → …