Date   : Thu, 05 Aug 1999 16:15:50 +0100
From   : "B.E.Newsam" <ben@...>
Subject: Re: Acorn

In message <000801bedf08$173479c0$0100a8c0@...>, Mark Usher
<marku@...> writes
>> The different OS was required because of the 60 Hz scan speed
>> of US TVs.
>> The modified machine was required to satisfy radiation requirements,
>> there was a metal shield inside the case.
>
>The different OS can be found at
>http://www.fortunecity.com/skyscraper/hirez/422/

I have an actual ROM labelled "USMOS 1.0". It has been modified as
follows: Pin 1 (top left) is bent flat, as is the second pin down the
right hand side. A small wire connects pin 1 to the first two pins on
the right hand side. Quite how it would work in emulation, I do not
know.
-- 
Ben