Ok so I picked up a 1040 ST and I'm in the process of testing it all out. The mouse it came with seems to be bad, it doesn't move in the vertical direction and its movement horizontally is weird (sometimes backwards).
I have been able to use a dos-box computer to write some 720kb disks with a few games (and a word processor) to test that otherwise the computer seems to be fine. I have another mouse on order from ebay but I'd like to be able to test that port to make sure it's not an issue there. I've been looking around for a game that uses two joysticks (or one that definitely uses port 0, the mouse port). What I'm finding is that the vast majority of disk images out there are .STX files which I can't write to floppy. I've only found a handful of .ST and .MSA files and none of these use two joysticks.
What would be a good resource to go to for .ST or .MSA and are there any recommendations of a two player game which would take advantage of the joystick port which the mouse also uses?