Date   : Thu, 29 Jan 2004 21:03:23 +0000
From   : jgh@... (Jonathan Graham Harston)
Subject: Re: Depraz + Penny & Giles mice...

Jules Richardson <julesrichardsonuk@...> wrote:
> Looking at the pinout of a BBC user port, the mice make use of 0V, +5V,
> and data lines 0,1,2 and 4,5,6,7. So it looks like they are indeed
> electrically compatible with the BBC too!
 
A mouse needs to use CB1 and CB2 as well to generate IRQs, otherwise the
mouse has to be continuously polled.  The standard wiring is:
 
     BBC User     Master Compact
    Port Mouse        Mouse
D0     Xdir             L
D1                      M
D2     Ydir             R
D3                     Xdir
D4                     Ydir
D5      L
D6      M
D7      R
CB1    Xref            Xref
CB2    Yref            Yref
 
If you want to chop the plug off an Archimedes mouse, the wiring is:
 
Arch.   9 8 7
Plug:  6 5 4 3
         2 1
 
       1 Xref
       2 L
       3 M
       4 Ov
       5 +5v
       6 Xdir
       7 Yref
       8 R
       9 Ydir
 
> a) Anyone know what BBC software ever made use of these mice - or
> compatibles with the same pinouts?
 
As a generic mouse driver you could try
http://www.mdfs.net/Software/CommandSrc/Mouse
 
-- 
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://www.mdfs.net/User/JGH/