There is the Commodore64 OS. Didn't it leave the file system stuff to the disk
drive?
Is XXDP source available? that would represent a very simple OS.
Cp// was available for several machines, but I wouldn't want to based a new OS
on it.
Sent from my Galaxy Tab® A
-------- Original message --------From: Rich Alderson
<s...@alderson.users.panix.com> Date: 10/26/16 1:06 PM (GMT-07:00) To:
simh@trailing-edge.com Subject: Re: [Simh] RT-11 source
> From: Johnny Billquist <b...@softjar.se>
> Date: Sun, 23 Oct 2016 03:11:05 +0200
> In fact, I would probably suggest Ray start with just writing some code
> to do some simple things without looking at existing code. The first
> thing needed would be to just have something that can load programs from
> a device, and run them. This will require some simple device driver,
> some simple file system, and a simple command line interpreter.
^^^^^^^^^^^^^^^^^^
That's not even needed. Beyond a 44 character file id in the VTOC on a disk,
none of the IBM batch operating systems for the System/360 has what we would
call a file system. OS/360 requires the programmer to know how much space a
file might occupy in its lifetime and allocate that (including overflow areas);
DOS/360 requires the programmer to do all of that, *AND IN ADDITION* to define
the exact location of the file on disk. I don't think anyone would argue that
those operating systems were unsuccessful in the marketplace.
Just sayin'.
Rich
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