15 Jan
2011
15 Jan
'11
1:39 p.m.
On 15 Jan 2011 at 18:02, Tony Duell wrote:
I am pretty sure I've seen new quadrature-output trackballs farily
recently. Not quite the same thing, but much the same interface...
I would argue that quadrature mice are not serial
but prallel in that
the states of the 4 quadrature signasl and the <n> buttons are all
available simultaneously on the interfce connector. Yes, you have to
look for changes in signals to see if/how the mouse is moving, but I
don;t think that makes it serial.
Perhaps, but when was the last time that you saw a new quadrature
mouse being offered for sale? Mice today universally communicate using a single serial bit stream.
This is classiccmp, right? I think more of my machines take
qudrature-ouptut mice than take serial mice (and of the latter, most of
them are HP-HIL interfaced mice, which is a bit-serial interface).
-tony