Serializing capability?

Bottom line up front: I need a program for engraving sequential
serial numbers. Does anybody have a suggestion for a PC based CNC
control program that outputs s/d signals, and has serial number
capability?

I've been using MINC99 to run my Sherline, by John Cauley of Digital
Systems. This program has some features that are unique to other
inexpensive CNC programs, including the IF command. This has enabled
me to write a g-code program to perform sequential serializing.
Unfortunately for me, my version has one of those hideous transistor
driver boards, and mine has burned out--again. It's time to upgrade
to step/direction. John had promised to email me the s/d version when
I was ready...but unfortunately for his wife, John died about a year
ago.

What are my options for an inexpensive serializing program?

Thanks!!!

Cliff