[VA] SRC #013 - Pi Day 2023 Special

[DavidM]

(03-26-2023 01:31 AM)2old2randr Wrote:  ...what are the two lines (!NO CODE and !RPL) at the beginning of the program for? Secondly, what is the meaning of the underscore in DROP%0_?

"!NO CODE" and "!RPL" are directives for the built-in MASD compiler that designate the appropriate modes for translation and output. They are specific to that particular compiler, and may not be needed if you set system flag -92. Other compilers (such as the HP Developer Tools) may not recognize them at all.

The underscore suffix is a convention used by the HP designers to indicate that the opcode is for an entry point that is not official, but is in a safe area and can be used in programs as needed. The underscore is actually part of the opcode's name, and doesn't have any special meaning for the compiler. You may also see certain SysRPL opcodes written within parentheses, which is another way to designate the same thing. You just need to know what your particular compiler is expecting.