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I was (and still am) thinking it was their own variant of CP/M but I can't come up with what it was called. We went to their Model IV before getting one of their IBM clones. I continued to use it for payroll even after we went to one of theirs that used DOS. That was because I could make my own changes when things like Social Security rates changed rather than have to have PeachTree send us a disk. I was also often having to enter new deductions for different union dues as we did jobs in different places.