DRL PDIO (octal 24) - do I/O on a system file.

Usage:

drl    pdio
(seek command)
zero   L(fileid),L(dcw1)
(read/write command)
zero   L(fileid),L(dcw2)
zero   L(stat),0

Where:

fileid

contains the one-word file code in BCI (two characters, right-justified with leading zeroes).

dcw1, dcw2, stat

are the same as for DRL DIO (see "expl drl dio").

Description:

Files allocated directly to the TSS Executive appear only in an executive table, and only privileged subsystems can do I/O on them. They do this using DRL PDIO.

The system files that may be accessed with DRL PDIO are

#D

Deferred processing queue file.

#P

The TSS primary file, on which subsystem programs are kept.

#Q

The TSS secondary program file, on which subsystem programs are kept.

#R

TSS dump file.

SS

System Scheduler file (SSFILE).

#S, #T, #U, #V

TSS swap files.

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