Re: Mouse interface stuff - K.O.?...

From: Richard Atkinson (
Date: 2000-09-19 01:16:29

On Mon, 18 Sep 2000, Hársfalvi Levente wrote:

> The problem is: the data is clocked by the _mouse_ and not the host
> machine :-(. As I read the docs, the mouse communicates the same way as
> the PS/2 keyboard does, and other docs say the keyboard data stream is
> clocked by the keyboard itselves.

That makes sense. I once read that the original IBM PC AT keyboard
controller had two ports and the keyboard only used one of them, so when
IBM produced the PS/2 with a proper mouse interface they simply designed a
mouse protocol similar to the keyboard protocol using the "spare" port
already on their keyboard controller. Sorry. I should have thought a bit

I'm more than excited about the prospect of a CBM serial mouse interface.
Especially as the joystick port has a +5V power connection so you can
power the mouse properly rather than relying on the line drivers of two
RS232 signals. The decision to use a MAX232 is the right one IMHO, as that
chip is becoming more and more widespread and Maxim are (at last) being
reasonable about pricing.

Are the docs on Funet yet? I'd quite like to build an interface for my old
3 button serial mouse. It will be interesting to decide what to do with
the third button...


Richard Atkinson
Software Engineer
Tenison Technology EDA Ltd

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