Author Archives: nowhereman999

Defender Conversion for the CoCo 3 – Part 6 – Three out of Three attract Screens are converted

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

Posted in CoCo Programming | Tagged , , , , | 1 Comment

Defender Conversion for the CoCo 3 – Part 5 – Another cool 6809 coding trick they used

Hello, I just wanted to document this neat little trick here.  For changing the colour of one of the 16 stars on screen randomly in Defender they do the following: * Table of stars @ $AF9D to $AFDC * Format … Continue reading

Posted in CoCo Programming | Tagged , , , , | Leave a comment

Defender Conversion for the CoCo 3 – Part 4 – Two out of Three Attract Screens are converted

I’ve been working hard on the Defender conversion and am happy with the progress and how well things are going.  I uploaded a video on YouTube showing that I now have two out of three attract screens working.  The code … Continue reading

Posted in CoCo Programming, Emulation | Tagged , , , , , , , | 3 Comments

Arcade Machine Conversion to the CoCo Overview

Hello, in a recent post I got a comment from username Perezernestoj who asked if I could convert Super Pac Man as my next game for the CoCo after I complete Defender.  I explained how much work this is and … Continue reading

Posted in CoCo Programming | Leave a comment

Defender Conversion for the CoCo 3 – Part 3 – Two more 6809 coding tricks they used

Below are a couple of coding tricks I’ve learned from Defender this week.  I thought I’d pass along the tricks for others to use, if they aren’t already. For simple loop counting, a nice fast way is to load an … Continue reading

Posted in CoCo Programming | Leave a comment

Defender Conversion for the CoCo 3 – Part 2 – Short and Sweet

Just a little blog entry to share a neat little bit of 6809 code. I’m really impressed with how well the 6809 is programmed in Defender.  I was decoding some of the Defender source code today and I came across … Continue reading

Posted in CoCo Programming | 7 Comments

Defender Conversion for the CoCo 3 – Part 1

Hello, I wasn’t going to blog about my conversion of the arcade version of the William’s classic game Defender for the Tandy Color Computer 3 but I decided it might be nice to share some of my progress.  Especially when … Continue reading

Posted in CoCo Programming | Leave a comment