USR
Format:
var = USR (exprl)
var = USR (exprl, expr2)
var = USR (exprl, expr2, expr3)
Supported by: COMX BASIC V1.00, Floating Point BASIC 2.2, Pecom 32 BASIC, Pecom 64 BASIC 1.0 and 4.0, Quest Super BASIC 3.0, 5.0 and 6.0, RCA BASIC3 V1.1, Telmac SBASIC v 24.3
Similar commands: Quest Super BASIC 1.4: CALL
This function acts like to CALL statement but with the difference that USR is a function to be used as part of an expression. When USR is encountered, a subroutine call is made to the machine language routine stored at expr1. Data may be passed to the subroutine in exactly the same way as the CALL statement.
The Quest Super BASIC call function is the same as the USR on the other computers. Super BASIC does not have the variant where no data is returned.