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My BASIC Quick
Abbreviation: U <SHIFT+S>
TYPE: Floating-Point Function
FORMAT: USR (<numeric>)
Action: The USR function jumps to a User callable machine language
SubRoutine which has its starting address pointed to by the contents
of memory locations 785-786. The starting address is established
before calling the USR function by using POKE statements to set
up locations 785-786. Unless POKE statements are used, locations
785-786 will give you an ?ILLEGAL QUANTITY error message.
The value of the <numeric> argument is stored in the floating-point
accumulator starting at location 97, for access by the Assembler
code, and the result of the USR function is the value which ends
up there when the subroutine returns to BASIC.
EXAMPLES of USR Function:
Commodore Cheetah made by Allen Monks, started
in the year 2000.