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Steve if the first nibble in an ODV entry is X'F' then the OES offset is 3
bytes long, not 2 bytes. This rule is sort of like "castling" in chess.
Thus very large programs may have OES components longer than 64K. The
first nibble in each ODV entry means...
0: variable
1: pointer
2: entry point
3: branch point
4: instruction definition list
5: operand list
6: constant
7: exception monitor
8: machine space pointer
9: unsigned binary
F: actual nibble type ('0' to '9') is in the OES, not ODV
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