 In the original generation, Intel 8086 processors were used.These were replaced by NEC V30s (an 80186 instruction set compatible processor with 8086 pinout implemented in CMOS and somewhat faster than the 8086 due to internal improvements) in the second generation, and ultimately by 80386 processors.The APC was responsible for the craft interface to the system, administration of status control for all hardware devices, Recent Change, billing, and overall administration.