Connect the controls to COM port 1 and using the keyboard you might be able to press Windows+R to get the run box or control-alt-delete to get task manager to run.
If you get the run box, type in devmgmt.msc and it'll show you all the hardware installed. Similarly if you got the task manager, in the applications tab, click new task and type in devmgmt.msc like above.
You might also be lucky that the shell (the GUI) is still installed but disabled, so typing explorer.exe using either method above might work.
BTW, you double posted this into programming
On a quest for Digital 573 and Dancing Stage EuroMix 2
By gods I've found it!