[BBC-Micro] Scrolling scrolling scrolling...

[Jonathan Graham Harston]

>Message-ID: <20061207223149.57363.qmail at web23115.mail.ird.yahoo.com>
 
Steve Fewell <kranser at yahoo.co.uk> wrote:
> --- Sprow <info at sprow.co.uk> wrote:
> > > AUG says this location is controlled by OSBYTE &75
> > > so you should probably use that method instead ;)
 
> If I remember correctly, some OSBYTE calls that the
> manual says can only be read, can actually be written
> to if the value of Y is set correctly (in the same way
> as per the READ/WRITE OSBYTE calls).
> 
> Not sure if this is the case here though.
 
Not that case here. All OSBYTEs < 128 ignore the Y value and set
it to zero internally, so that even those calls that internally
use the code from a >128 OSBYTE (such as *fx1 -> *fx241 or
*fx4 -> *fx237), Y is set to zero, so only writing is possible.
 
-- 
J.G.Harston - jgh at arcade.demon.co.uk - mdfs.net/User/JGH
There are three food groups: brown, green and ice cream.