List of Special Registers

• rA, arithmetic status register [21];
• rB, bootstrap register (trip) [0];
• rC, continuation register [8];
• rD, dividend register [1];
• rE, epsilon register [2];
• rF, failure location register [22];
• rG, global threshold register [19];
• rH, himult register [3];
• rI, interval counter [12];
• rJ, return-jump register [4];
• rK, interrupt mask register [15];
• rL, local threshold register [20];
• rM, multiplex mask register [5];
• rN, serial number [9];
• rO, register stack offset [10];
• rP, prediction register [23];
• rQ, interrupt request register [16];
• rR, remainder register [6];
• rS, register stack pointer [11];
• rT, trap address register [13];
• rU, usage counter [17];
• rV, virtual translation register [18];
• rW, where-interrupted register (trip) [24];
• rX, execution register (trip) [25];
• rY, Y operand (trip) [26];
• rZ, Z operand (trip) [27];
• rBB, bootstrap register (trap) [7];
• rTT, dynamic trap address register [14];
• rWW, where-interrupted register (trap) [28];
• rXX, execution register (trap) [29];
• rYY, Y operand (trap) [30];
• rZZ, Z operand (trap) [31];