DOS 1.0 copyright string

From: Douglas Quebbeman <>
Date: Mon Sep 10 12:32:39 2001

> Hello, all:
> I was able to get my hands on the two DOS 1.0 disks. So, I spent a
> few minutes with Sourcer and a good hex editor in search of the DR copyright
> notice. I didn't find it.
> Maybe I misunderstood the timing of the message, but I thought that
> the 1.0 version of DOS contained copyright information from Digital Research
> and when IBM found out, they compelled MS to expunge it, resulting in the
> 1.1 version.

My recollection (often wrong) was that there was a sequence of code
(load register, move to another register, do a call, etc) that was
taken verbatim from CP/M and used in DOS; not an ASCII string containing
a copyright notice.

-doug q
Received on Mon Sep 10 2001 - 12:32:39 BST

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