Articles by Glen's Weblog

Back in 2017, Ed Snider released a cool video and audio player for the CoCoSDC on a CoCo 1. I thought it was wicked and at that time I remember fighting with the CoCoSDC to try and get some of … Continue reading → …

Hello, I came across a website https://codegolf.stackexchange.com which is a website where people ask others to write programs in any programming language they wish and to make the program as short as possible. I came across what I thought was … Continue reading → …

Hello, it’s been quite awhile since my last blog post, I got tired/burnt out of working on ROBOTRON and I’ve also been doing a lot of home renovations and other life events have kept me from my CoCo hobby. I … Continue reading → …

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 → …