OPR Group Decoding

Bit-3 and Bit-11 of the OPR instruction encode one of three groups.
 
 OPR      PL     X7,GP1  
          LX7    8-0 
          PL     X7,GP2  
          EQ     GP3
 
 
Bit-3
Bit-11
Decoding
0
X
Group 1
1
0
Group 2
1
1
Group 3
 
 
PDP-8 Simulator
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