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Blogs

A little more 6809 optimizing

September 20, 2025 Glen's Weblog

While working on my BASIC to 6809 Compiler, I’ve been trying to optimize the code as much as possible. Nothing ground breaking here but I thought I’d share this little trick I came up with for copying 8 bytes of … Continue reading → …

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Blogs

CoCo BASIC to 6809 Compiler

July 27, 2024 Glen's Weblog

I wrote a compiler for the TRS-80 Color Computer called BasTo6809 for a couple reasons. One is to learn exactly how to parse an expression using recursion and I thought it would be cool to have fast programs. The compiler … Continue reading → …

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Blogs

CoCo 3 – 256 x 200 x 16 colours is a great resolution

May 25, 2023 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 → …

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Blogs

CoCo 3 Memory Test

May 11, 2023 Glen's Weblog

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 → …

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Blogs

MOS 6502 to Motorola 6809 Assembly Language Transcoding

February 15, 2023 Glen's Weblog

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 → …

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Blogs

Streaming large files on the CoCoSDC

November 30, 2022 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 → …

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Blogs

Code golf on the CoCo

November 2, 2022 Glen's Weblog

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 → …

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Blogs

ROBOTRON last update…

May 4, 2022 Glen's Weblog

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 → …