Anyone have any info on this cartridge? I snagged it in a huge lot of computer stuff and I can't find out anything about it.

This cart is for the TRASH-80 (TRS-80) and is by the Micro Works of Del Mar CA. It has a white printed label and is larger then most TRS-80 carts. It's number on the front says
SDS80C "Software Development System Editor/Assembler/Monitor"
and has a version II.2 that is hand written on the label. bottom of the label has a warning that reads "Opening this rompack will void your warranty!"