Articles by Sub-Etha Software

See also: challenge, responses, and more responses. Today Sebastian Tepper submitted a solution to the “draw black” challenge. He wrote: I think this is much faster and avoids unnecessary SETs. Instruction 100 will do the POKE only once per character block.– Sebastian Tepper, 7/5/2022 The routine he presented (seen in …

See also: part 1, part 2, part 3, part 4, unrelated, and part 5. In part 4 of this series, Jason Pittman provided several variations of creating the attract screen: Jason Pittman variation #1 If those four corners bother you, then my attempt will really kick in that OCD when …

In 1994, Sub-Etha Software released Invaders09 – a Space Invaders-style game for the CoCO 3. Invaders09 by Sub-Etha Software Invaders09 by Sub-Etha Software The game was written in 6809 assembly, and ran under Microware OS-9 Level 2. Jamie Cho took on the task of …

I did some updates to this site a year or so back, and found out it broke images in all my older posts. I think I fixed those last week, so if you find any broken images, please drop a comment on that post so I can look at them. …

I hate it when this happens… It looks like a 4TB drive in my 5-bay Drobo has gone out. Drobo cannot detect it. I have dual-drive redundancy enabled, so two drives can fail and I’d still have my data… Fortunately. Drobo 5C showing a 4TB drive failure. Hopefully, …

When I moved from my Commodore VIC-20 to a TRS-80 Color Computer, I spent much time going through the “Getting Started with Color BASIC” and “Getting Started with Extended Color BASIC” manuals that came with it. If you had the original manual revision, you may have been taught things slightly …

In this 13 minute video, I discuss a bit about my 1994 video game, Invaders09, including game features and details on the cheat mode. [embed]https://youtube.com/watch?v=xTzC1qTPbto&feature=oembed[/embed] …

I have posted the source code to my 1994 CoCo 3 OS-9 Space Invaders-style game to GitHub: https://github.com/allenhuffman/Invaders09 Current version is 1.04, from 2015. Screen Shots Invaders09 by Sub-Etha Software Invaders09 by Sub-Etha Software Maybe one day I’ll do a 1.05. I never did …

Radio Shack introduced the Color Computer in 1980. It came 4K or RAM, and Microsoft Color BASIC in the ROM. It could be expanded to 16K RAM, which allowed adding a second ROM for Extended BASIC. A plug-in disk interface cartridge came later, with it’s own ROM containing Disk BASIC. …

Awhile back, the Internet led me to a wondrous thing: an online 6809 emulator, complete with compiler, debugger, and text/graphical output! http://6809.uk This website, “designed and coded” by Gwilym Thomas, is amazing. If has a spot where you can enter 6809 assembly source code, then you can compile and run …