Address (Hex) Name Description AL Accumulator A low word (bits 150) Accumulator A high word (bits 31-16) 89ABCDEFo1 G Accumulator A guard bits(bits 38-32) Accumulator B low word (bits 15-0) H Accumulator B high word (bits 31-16) BG Accumulator B guard bits (bits 39-32) Temporary register TAN Transition register ARO Auxiliary register o AR1 Auxiliary register 1 12 AR2 Auxiliary register 2 AR3 Auxiliary register 3 AR4 egister 4 AR5 Auxiliary register 5 16 AR6 Auxiliary register 6 AR7 Auxiliary register 7 18 SP Stack pointer Circular-buffer size register BRC Block-repeat counter 1日 RSA Block-repeat star address 1C REA Block-repeat end address PMST Processor mode status register 1E XPC Program counter extension register (548, 549 5402.5410,and'5420) 1E-1F Reserved