Date   : Tue, 06 Dec 2005 15:20:33 +0000
From   : Andrew Benham <adsb@...>
Subject: Re: Test Sideways Ram

Richard Gellman wrote:

> I believe on the B ROMSEL is actually readable (ISTR its not on a 
> Master, hence interrogation of &F4, the MOS's copy).

Other way round.  ROMSEL on the B is a write-only register, hence
&F4 being a copy.  On the Master, ROMSEL is read/write - with &F4
still a copy (as that's what Beeb programmers had come to expect).

-- 
Andrew Benham           adsb@...       
Southgate, London N14, United Kingdom

The gates in my computer are AND OR and NOT, not "Bill".