User`s manual

.REDIR

5-60

.REDIR

Name

.REDIR - Redirect I/O routine

Code

$0060

Description

.REDIR is used to select an I/O port and at the same time invoke a

particular I/O routine. The invoked I/O routine reads or writes to

the selected port.

Entry Conditions

R03: Port

R04: I/O routine to call

R05: R03 as required by the invoked System Call routine

R06: R04 as required by the invoked System Call routine

R07: R05 as required by the invoked System Call routine

R08: R06 as required by the invoked System Call routine

Exit Conditions Different From Entry

R03: May be changed by I/O routine