Found a Weird Tandy CoCo Cartridge

[morrodox]

I was at my local computer recycler earlier this week and they had a small stack of Tandy CoCo carts. Amongst all the common stuff I found one with a white dot-matrix label with this on it:

AXX-2023
COLOR DIAGNOSTICS CARTRIDGE
VERSION 2.0

Some sort of test cartridge obviously, but I didn't see it listed in the DP guide. Worth anything? (I don't have a machine to verify it works.)

[Moo Cow]

do you have pictures of it?

[Schenley]

Having grown up on the Coco, I can tell you that not much of the Coco stuff is rare. Even if it is rare, there isn't much of demand for Coco stuff - just check Joe's intro in the DP guide. ;-)b

I do have a couple working Cocos if you want me to check out what it does.

[vintagegamecrazy]

Valuable or not, test carts are pretty rare to start, probably would fetch at least a few bucks more on Ebay. If you don't want it, PM me I could trade something for it as I do like CoCo stuff and have a ton for trade.
Like he said before, they aren't worth a ton, but it's always neat to find diagnostic carts and the like. I would love to see what it does and maybe post a screen or two for the site. Good find!