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Description Jump if X negative
Format JXN <disp.>
Code 133 4008
Affected If X<0 P:=P+Δ
Type User
Architecture ND-100, ND-110

JXN is an assembly instruction. If the X register is negative (bit 15 = 1), it jumps the program execution to the address of the program counter (P register) plus the value of displacement, which can be between -128 to 127. Else it continues the program execution at (P) + 1.