← spy0 → spy2

CADR – PDP11 EXAMINE (IR, OB) [spy1]

3E0674LS244TS BUS DVRAENBBENB3F2174LS244TS BUS DVRAENBBENB3F2374LS244TS BUS DVRAENBBENB3F2574LS244TS BUS DVRAENBBENB3E0374LS244TS BUS DVRAENBBENB3E0174LS244TS BUS DVRAENBBENB3C2474LS244TS BUS DVRAENBBENB3C2374LS244TS BUS DVRAENBBENB2C1874LS244TS BUS DVRAENBBENB2C1774LS244TS BUS DVRAENBBENBSPY.OBLSPY.OBLSPY.OBHSPY.OBHOB31OB30OB29OB28OB27OB26OB25OB24OB23OB22OB21OB20OB19OB18OB17OB16OB15OB14OB13OB12OB11OB10OB9OB8OB7OB6OB5OB4OB3OB2OB1OB0SPY15SPY14SPY13SPY12SPY11SPY10SPY9SPY8SPY7SPY6SPY5SPY4SPY3SPY2SPY1SPY0SPY15SPY14SPY13SPY12SPY11SPY10SPY9SPY8SPY7SPY6SPY5SPY4SPY3SPY2SPY1SPY0SPY.IRHSPY.IRHSPY.IRMSPY.IRMSPY.IRLSPY.IRLIR47IR46IR45IR44IR43Instruction Register bit 42: POPJ-bit, Return after next instruction.IR42IR41IR40IR39IR38IR37IR36IR35IR34IR33IR32IR31IR30IR29IR28IR27IR26Instruction Register bit 25: DISPATCH: L-PC flag. Alter return address pushed on SPC by the CALL transfer type, if the N bit is set, to be the address of this instruction rather than the next instruction.IR25IR24IR23IR22IR21IR20IR19IR18IR17IR16IR15IR14Output Bus Control. With IR12. 1 ALU; 2 ALU shifted right by one bit, with the correct sign shifted in; 3 ALU shifted left by one bit, shifting in Q31 from the right.IR13Output Bus Control. With IR13. 1 ALU; 2 ALU shifted right by one bit, with the correct sign shifted in; 3 ALU shifted left by one bit, shifting in Q31 from the right.IR12IR11IR10Instruction Register bit 9: JUMP: R-bit, ReturnIR9Instruction Register bit 8: JUMP: P-bit, CallIR8Instruction Register bit 7: JUMP: N-Bit, NOPIR7Instruction Register bit 6: JUMP: Invert ConditionIR6Instruction Register bit 5: JUMP: If low, rotation count for M source. If high, condition number.IR5IR4IR3Instruction Register bit 2: ALU: Carry this bit into the low end of the ALU.IR2Instruction Register bit 1: ALU: Q control. 0 Do nothing; 1 Shift Q left, shifting in the inverse of the sign of the ALU output (ALU31); 2 shift Q right, shifting in the low bit of the ALU output (ALU0); 3 Load Q from ALU outputIR1IR0SPY15SPY14SPY13SPY12SPY11SPY10SPY9SPY8SPY7SPY6SPY5SPY4SPY3SPY2SPY1SPY0SPY15SPY14SPY13SPY12SPY11SPY10SPY9SPY8SPY7SPY6SPY5SPY4SPY3SPY2SPY1SPY0SPY15SPY14SPY13SPY12SPY11SPY10SPY9SPY8SPY7SPY6SPY5SPY4SPY3SPY2SPY1SPY0191161824614128119713155317191161824614128119713155317191161824614128119713155317191161824614128119713155317191161824614128119713155317191161824614128119713155317191161824614128119713155317191161824614128119713155317191161824614128119713155317191161824614128119713155317

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