Date   : Wed, 29 Mar 2000 00:41:48 +0100
From   : jgh@... (Jonathan Graham Harston)
Subject: BBC Computers and mice

"Carey Williams" <Carey@...> wrote:
> I have some mice which connect through the user port underneath the
> machine. Has anyone a program that can run these or could write a program
> that would for example enable the mouse to be used in the word processor
> in place of the arrow keys. Most children are now used to using mouse and
> this would make the old Beebs more accessible for them.
 
I have a *MOUSE command that works on all BBC/Master computers and
provided Osword 64, Osbyte 128 and Osbyte 129 read routines.  I have put
it on my website, along with a test program that shows how to read the
mouse state.  They are at http://mdfs.net/Software/CommandSrc/Mouse/
 
There are two defined interfaces to read the mouse state, AMX and Arc:
 
Osword 64:
Returns:  XY+0,1 Mouse X
             2,3 Mouse Y
             4   Text X
             5   Text Y
             6   Button state: RML-----
 
ADVAL(7) (Osbyte 128,7) - Read mouse X position
ADVAL(8) (Osbyte 128,8) - Read mouse Y position
 
INKEY-109 (Osbyte 129,&FF93) - Read RIGHT button
INKEY-13  (Osbyte 129,&FFF3) - Read RIGHT button
 
INKEY-108 (Osbyte 129,&FF94) - Read MIDDLE button
INKEY-12  (Osbyte 129,&FFF4) - Read MIDDLE button
 
INKEY-107 (Osbyte 129,&FF95) - Read LEFT button
INKEY-11  (Osbyte 129,&FFF5) - Read LEFT button
 
-- 
J.G.Harston (JGH BBC PD Library) 70 Camm Street, Walkley, SHEFFIELD S6 3TR
jgh@...                - Running on BBCs & Masters with SJ MDFS FileServer
            Z80+6502/CoPro+Tubes/Econet+SJ -- http://mdfs.net
            A TRUE Klingon Warrior does not comment his code!