Subject: Re: RL01 support in NetBSD?
To: None <port-vax@NetBSD.ORG>
From: John Wilson <>
List: port-vax
Date: 02/19/2000 11:09:09
>From: Johnny Billquist <bqt@Update.UU.SE>

>Anyway. The RT11 file system has the following attributes that I know of:
>. All files must be contigous.
>. You can only have one file open for writing on the disk at the same
>  time.
>. The directory is a few blocks at the beginning of the disk.
>. The maximum file size is 65535 blocks.
>I'm sure someone will correct me on these points when I'm wrong. :-)
>(I'm not an RT-11 hacker, but I am an OS/8 hacker, which is very similar.)

RT-11 lifts the "only one output file" restriction of OS/8.  Otherwise correct.

In case anyone cares, I have the RT-11 format written up in a comment block
in this program:

OS/8's file system is described there too...  N.B. all constants are octal
unless they end in "d" or "h".  The RT description is immediately after a
form feed character so you can just search for that if you don't like reading
80x86 assembly code.

John Wilson
D Bit