alright, it's no longer just hanging there and doing nothing. Now it says "ERRORSYS (0) Unrecoverable error 650: Processor stack fault" Any suggestions or links to fixes?

For most of the day now, I've been trying to install a custom-made point-of-sale program built approximately 20 years ago. I've been trying to build it off two floppy disks. I've tried using physical disks with an external floppy drive, a virtual floppy drive, and simply putting all the files in …