I once made a lot of money by guiding a colleague over the phone how to write a program with DEBUG.com to do a software 'upgrade' consisting of 128 bytes to cha

I once made a lot of money by guiding a colleague over the phone how to write a program with DEBUG.com to do a software 'upgrade' consisting of 128 bytes to change in the older version .. this was pre-Internet-everywhere, and the time cost of waiting for a tape (yes we delivered DOS software on tape back in the day) to arrive across country was too high. An hour of careful hex narration later, we got it done and days of downtime were saved. Oh, what a bonus that was (went straight into a new 486, lol). Kind of miss DEBUG.com now that I think about it.