HP 68302 User Manual page 212

Function Codes
Addresses can be specified with any of the function codes. The function
codes are appended to the addresses, preceded by @ (for example:
0a3bc@up).
You must include a function code when referring to an address that was
mapped with a function code other than X. This general rule is true except
when:
•
Specifying addresses in trace commands (because address qualifiers are
compared with values captured on the address bus -- function code
information is captured as part of the bus cycle status).
•
Referring to a program counter address (because the function code is
determined by the Supervisor/User status flag bit).
C Operators
The debugger expressions support the following C operators. The order of
operator evaluation can be modified using parentheses '(' and ')'; however, it
basically follows C conventions:
Pointers
Arrays
Structures or unions
Unary minus
Chapter 7: Expressions in Commands
'*' and '&'
'[' and ']'
'.' and "->"
'-'
Function Codes
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