Yes, the IBM System/360's instruction set is still a part of IBM's current mainframes, so customers can still run their 1964 programs. (Does anyone know when IB

Yes, the IBM System/360's instruction set is still a part of IBM's current mainframes, so customers can still run their 1964 programs. (Does anyone know when IBM dropped backwards compatibility for their 1950s architectures? They provided emulation for 1401 and 709 systems for a long, long time.) It will be interesting to see if the 360 or x86 instruction set lasts longer.