Articles by Glen's Weblog

Since CoCo’s don’t have dedicated hardware sprites, I started writing my own library to handle this task. So in the future I won’t have to re-write this code again and again. I recently started reverse engineering the Amiga version of … Continue reading → …

I upgraded my CoCo 3 with a 2 Meg upgrade kit from Cloud9 that I picked up at CoCoFest this year. Mark Marlette makes fantastic hardware for the CoCo 3 and has been doing it forever. If you want great … Continue reading → …

I’ve started looking at some MOS 6502 assembly code and I’m in the process of transcoding it to Motorola 6809 assembly. I’ve found an excellent PDF online describing the process of translating programs from the 6502 to the 6809 starting … Continue reading → …

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 → …