RT11 sysgen and disk partitions

Jerome H. Fine jhfinexgs2 at compsys.to
Tue Mar 8 21:03:17 CST 2005

 >Vintage Computer Festival wrote:

>>On Tue, 8 Mar 2005, Zane H. Healy wrote:
>>The Monitor you're using was Sysgen'd to load those drivers automatically.
>>You could probably free up a little memory by doing a Sysgen that just
>>includes the drivers you need.
>Ok, makes sense.  I suppose I have to find an original system master to
>make my own sysgen.  Though the boot disk I'm using now suits me fine for
>my current purposes.
Jerome Fine replies:

As far as I understand RT-11, all device drivers
are auto installed at boot time if the hardware
which corresponds to that device driver is present.

In addition, the resident device driver must be
permanently LOADed.  If the command SHOW  DEVICE
ia used, the system device will be shown as resident
just above the monitor.

After the system device driver and the resident monitor
are set up in memory, the BSTRAP program does a few more
things followed by an attempt to make the LD(X).SYS device
driver "CLEAN" and finally by trying to execute the
startup command file - which has a specific name for
each monitor.

The user may edit that startup command file to include
most normal RT-11 commands, about the only exception
being that a nested command file must be the last command.

As for original system distributions, there are a large
number at http://www.classiccmp.org/PDP-11/RT-11/dists/
in the file RT11DV10.ISO.zip which contains 13 RT-11
distributions ending with V05.03 of RT-11 for use by
hobby users under SIMH.  The actual ISO file can be
burned to a CD or used with SIMH as:

Sincerely yours,

Jerome Fine
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