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Some sort of progress on deciphering the CHAR(2) "resulting condition
information" in the Body section you described Simon:
CHAR(8) op-code name
CHAR(2) op-code number
CHAR(1) optional instruction forms
CHAR(2) possibly resulting condition information
Per the Information Centre, branch and indicator keywords are divided into
HI MXD NOR POS TR ZC
CR DEN IGN LO NEG NTZNTC RO
AUTH DFR DQ EQ INF SE SGN ZER ZNTC
EC NAN NTZC UNEQ UNOR
The first byte appears to indicate which groups are valid for the op-code:
Bit 0: Group 1
Bit 1: Group 2
Bit 3: Group 3
Bit 6: Group 4
The corresponding bits in the second byte appear to denote whether the
condition can be negated. This would explain why the second byte is
b'00000000' for the SIGEXCP op-code as keywords IGN and DFR cannot be
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