I found out the Coco3 needs no upgrade at all. It has Super Color Extended BASIC ROM and Disk Controller Disk BASIC ROM.

Here is a link where you can get software for your TRS-80 Color Computer 1, 2 and 3.

http://www.colorcomputerarchive.com/

Here is some links for hardware.

http://www.cocowares.com/index.php

http://www.cloud9tech.com/

http://members.iinet.net.au/~ianmav/trs80/cocos.htm

I just got a HP L1506 LCD Monitor today for a Coco 3 Computer. I am going to get a Coco SDC and looking to get the 512 memory upgrade too.

Here is some books I found for the Coco 3 for free but no Coco 3 yet.

Introducing Your Color Computer 3 (Tandy) Color Computer 3 BASIC Quick Reference Manual (Tandy) Color Computer 3 Exended Basic ( […]
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Introducing Your Color Computer 3 (Tandy)
Color Computer 3 BASIC Quick Reference Manual (Tandy)
Color Computer 3 Exended Basic (Tandy)
Color Computer Disk System (Tandy)
Color Computer Disk System Quick Reference Guide (Tandy)
Color Computer Disk System Programming Manual (Tandy)
Multi-Pak Interface for Color Computer 2 (Tandy)
Speech-Sound Cartridge Manual (Tandy)

I am going to buy a 512 memory upgrade and Coco SDC when I can.

Looking for a good working CoCo 3 Computer if anyone has one for sale send me a PM on detail of it. I am trying to bring back old times.

I found out this week I broke my back so I'm not going be here very much tell it get better. So you all have fun with what you can do. I will be back when I can.

So I will see you later and maybe I will have a Coco3 to use.

Well I have a Coco3 with 512k with all manuals and I even have a Modem Pak now. I want to be able to use my PC LCD Monitor when I get the cable. I want to get Drivewire or CocoSDC. I think it will be CocoSDC that way I won't another Computer to use my Coco3.

Since I now have a Coco2 and Coco3 I might try to link them together threw the RS-232 port.

This computer game is based on BrainTeaser by Wim Nijland.
Choose digits from 1 to 9, split by reaction method into three groups: 1-3-7-9, 2-4-6-8, and 5.
The goal is to display all digits except 5, avoiding the field clearing.

Attached are an image of the cassette tape and the source code.

You can see all the CoCos (including the 3) on my "Daves Old Computers" website, I also have scans the RS catalog pages, some Byte artistics and other related material.

The 6809 was ny favorite 8-bitter (still sometimes build dedicated embedded systems based on it) - the CoCo was one of the few end-user systems based on it!