Anyway, after disassembling the existing EZR programs I figured out where
the important ROM routines were (can't remember if I ever found a way to
disassemble the ROM itself [update - looks like I did; finally found
one of my source diskettes]), and so wrote my own programs to use them and
tried out my modified disks on one of the EZR systems
when it wasn't being used. This one is just a minor hack; I am much
more proud of the timing routine I wrote later.