AInstruction Coding
A – 13
TERM Termination codes for DO UNTIL
0 0 0 0 Not equal NE
0 0 0 1 Equal EQ
0 0 1 0 Less than or equal LE
0 0 1 1 Greater than GT
0 1 0 0 Greater than or equal GE
0 1 0 1 Less than LT
0 1 1 0 NOT ALU Overflow NOT AV
0 1 1 1 ALU Overflow AV
1 0 0 0 Not ALU Carry NOT AC
1 0 0 1 ALU Carry AC
1 0 1 0 X input sign positive POS
1 0 1 1 X input sign negative NEG
1 1 0 0 Not MAC Overflow NOT MV
1 1 0 1 MAC Overflow MV
1 1 1 0 Counter expired CE
1 1 1 1 Always FOREVER
X X Operand codes
0 0 0 X0 (SI for shifter)
0 0 1 X1 (invalid for shifter)
0 1 0 AR
0 1 1 MR0
1 0 0 MR1
1 0 1 MR2
1 1 0 SR0
1 1 1 SR1
Y Y Operand codes
0 0 Y0
0 1 Y1
1 0 F (feedback register)
1 1 zero
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