Wang 300 Calc
ard at p850ug1.demon.co.uk
Sat Sep 15 17:00:30 CDT 2007
> Why, other than excessive stinginess did they switch to that, instead of
> the REAL 5 pin DIN that even I can solder?
Those mini-DINs are the worst (common) connectors to solder, but the 6
pin ones are easier than the 9 pin. The Acorn Archimedes uses the latter
for its mouse interface (it's a quatrature mouse with 3 buttons, the 9
pins being +5V, ground, the 4 quatradure signals and the 3 button
Anyway the first Arc I obtained came without a mouse. Obtaining a
3-button quadrature mouse was easy in those days (about 10 years ago),
they were commonly sold as add-ons for the ST and Amiga. And getting a 9
pin mini-DIN plug wasn't hard either.
But wiring it was,. Worse than that, as we all know, if you get the 2
quadrature signals for a given axis the wrong way round, the cursor moves
the wrong way relative to the mouse motion. So while I could connect up
the power lines and the buttons with some certainty, I had to 'edit' the
quadrature signals to get things going the right way. And that was
Acutally, I can see very little that's good about the mini-DIN connecotr.
It's painful to wire, it doesn't have a good contact area, it's difficult
to insuer (particularly 'blind', it's not that robust. I can see no
reason qhy they should be used at all.
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