35h FL$SETP select current pack
Input B = number of datapack to select (MUST BE 0 to 3)
Output - none -

Selects the datapack given in B. This datapack will then be used by other file system services.

B should be set to zero for A:, 1 for B: etc. This value is not checked by FL$SETP.

NOTE : Users calling FL$SETP must always ensure that B is in the range 0 to 3 to ensure compatibility with all operating system versions.

        CMP     B,#3
        BHI     ERROR                   ; Error if B > 3
        OS      FL$SETP
Errors - none -