Commodore 2001-8 User Manual page 101

.: 0000 4C 3A 03
10) Exit from the monitor and re-enter BASIC.
.x
READY
11) Prove that the linkage is established by using both SYS and USR.
A
=
USR(OI
SYS (3*256
+
3*16
+
10) (Enter these
as
direct commands.)
99