Hi guys thanks for the replies just wanted to get a little info. Terry Raymond On Nov 19, 2017 11:31 AM, "Gerrit Heitsch" <gerrit@laosinh.s.bawue.de> wrote: On 11/19/2017 07:06 PM, silverdr@wfmh.org.pl wrote: > > On 2017-11-19, at 18:58, Francesco Messineo <francesco.messineo@gmail.com> >> wrote: >> >> Optical mice shine an led on the surface and then watch the surface move. >>> They weren't available in 1980 >>> >> >> In 1982 for sure, SUN optical mouse for example (I have a few of them). >> The "trick" is that they required a special metal pad with a special >> pattern (cross lines) to function. >> > > Precisely. Although I thought they came in the second half of the eighties. > There were also 2 different kinds of them. The original SUN mouse needed a grid of blue and black lines and used a red and an IR LED (*). The later ones uses a black/blad grid and only IR LEDs. I still have 2 of those and the matching mouse pads. The interface was serial, 1200bps if I remember correctly. (*) Also available for Amiga Gerrit Message was sent through the cbm-hackers mailing list Message was sent through the cbm-hackers mailing listReceived on 2017-11-19 19:01:48
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