Gary wrote: > I have heard that only one machine was ever delivered without the > decimal set, but it may have just been rumour.
All the 360/91's were delivered without the decimal instructions. The OS emulates them when the illegal instruction exception is generated. But maybe you meant only on machines where decimal was in option. The 360/20 has the decimal instructions except for SRP, but not most of the binary instructions. (It has MP and DP but not M, MR, D, or DR.) Without having ever looked at it, I presume that RPG does mostly decimal arithmetic, other than address calculations. -- glen
