Articles by Glen's Weblog

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 → …

I’ve been working on a couple projects. The first is a new loader program for the CoCo 3 that uses the excellent ZX0 compression by Einar Saukas and the efficient and fast 6809 decompression routine written by Doug Masten. The … Continue reading → …

There is some tricky copy protection used in Joust to stop anyone tampering with the code. I just wanted to document it here just in case anyone wants to learn about it. I was playing around with the Joust code … Continue reading → …

This demo shows that you don’t need to double buffer the screen if you know where the scan line is. You can draw your sprites where the scan line is not drawing. I’ve posted the source to my GitHub link … Continue reading → …

I was going to post about this topic while I was working on Defender but didn’t get around to it and since I’ve started working on Joust which has the same video hardware I’ve come across the same situation and … Continue reading → …

Hi All, I’ve been working on porting the arcade game Joust to the CoCo 3. I wasn’t going to discuss it until I actually got it working as I don’t want the project to end up like my Defender port. … Continue reading → …

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 → …

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 → …