Commodore PET - Sys; Ti Ti; Usr

Number of jiffies since current startup.
Time of day string.
The status should
be checked. if it is going to be checked. immediately after
an INPUT# or GET# statement.
Examples:
10 IF ST < >0 GOTO 500 Branch on any error.
50
IF ST=4 THEN ?"SHORT BLOCK"
SYS
SYS is a system function that transfers program control to an independent
subsystem.
Format:
SYS(address)
where:
address
is a numeric constant, variable. or expression
representing the starting address at
which ex-
ecution of the subsystem
is to begin. The value
must
be in the range 0~address~65535.
Unlike other functions. SYS can be specified alone in an immediate program
statement. Use of the
SYS command is described further in Chapter 6.
TI, TI$
TI and TI$ represent two system time variables.
Format:
TI
TI$
Examples:
?TI
TI$="081 000"
Usages of TI and TI$ are described in Chapter 5. under "Setting Time of
Day."
USR
USR is a system function that passes a parameter to a user-written assem-
bly language subroutine whose address
is contained in memory locations 1 and 2.
and fetches a return parameter fram the subroutine.
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