Control lines (to form microcodes) 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 RESCYCLE DA IO HLT IOCLKS SFLAGS SIR SIAR SR3 SR2 SR1 SR0 STMP SRAM SACC SMAR IOCLKE EBUS1 EIAR ER3 ER2 ER1 ER0 EACC ERAM ALU2 ALU1 ALU0