Date   : Mon, 13 Jun 1983 01:37:40 EDT (Mon)
From   : Rick Conn <rconn@brl>
Subject: New SYSIO

AR84:CPM contains a new version of  SYSIO  (my  redirectable  I/O
package  under  ZCPR2).   This file, called SYSIO 2ASM, is source
for a redirectable I/O package which gives the  user  seven  con-
soles  and five printers under ZCPR2.  It gives the general ZCPR2
user a fairly good example of how to implement a redirectable I/O
package  under ZCPR2 so that DEVICE, IOLOADER, and RECORD can in-
teract with it.

This package defines the following physical devices:

        Consoles --
                TTY     Printing Terminal
                CRT     CRT Display
                CRTMOD  CRT and Modem in Parallel
                CRTREM  CRT Input and CRT/Remote Computer Output
                CRTMOD2 CRT Input and CRT/Modem Output
                CRTTY   CRT Input and CRT/TTY Output
                CRTNEC  CRT Input and CRT/NEC Spinwriter Output
        Readers and Punches --
                MODEM   Modem
                CLOCK   DC Hayes Chronograph
        List Devices --
                TTY     Printing Terminal
                CRT     CRT Display
                NEC     NEC Spinwriter Output
                MODEM   Modem
                REMOTE  Remote Computer

In interacting with DEVICE, the user need no longer concern  him-
self  with  the  arbitrary  physical device names associated with
STAT.  DEVICE allows the user to find out the names of the physi-
cal  devices  he has available and to assign them mnemonically as
he wishes.  For instance, the following commands are valid:

        DEVICE Display All
                -- Display the names of all physical devices
        DEVICE Console=CRT,List=NEC
                -- Assigns the CRT to the console and the NEC
                        Spinwriter to the List Device
        DEVICE //
                -- Displays built-in documentation

DEVICE is also documented in the ZCPR2 literature.

Enjoy!

        Rick

P.S.  Ron Fowler's MLOAD is useful in creating SYSIO.IO.