ESN              3997 src/dps8/dps8_cpu.c void add_dps8m_APU_history (word15 ESN, word21 flags, word24 RMA, word3 RTRR, word9 flags2)
ESN              4000 src/dps8/dps8_cpu.c     w0        |= (ESN & MASK15) << 21;
ESN              2374 src/dps8/dps8_cpu.h void add_dps8m_APU_history (word15 ESN, word21 flags, word24 RMA, word3 RTRR, word9 flags2);