swsh@ellis.uchicago.edu (Janet M. Swisher) (05/17/91)
Just out of curiosity, have any of you ever tried attaching two keyboards to the same Mac -- sort of like the extra steering wheel and brake pedal in Driver's Ed cars? If you had a Mac with two ADB ports, you could put a keyboard on each one, and daisy-chain the mouse so it sits in the middle. Would this be likely to do something nasty like frying the ADB port? I am asking because we are thinking of setting up a Mac classroom somewhat on the cheap, and someone suggested this as a way to allow two students to better share a Mac than one hogging the keyboard and the other just watching. -- Janet Swisher Internet: swsh@midway.uchicago.edu University of Chicago Phone: (312) 702-7608 Academic and Public Computing P-mail: 1155 E. 60th St. Chicago IL 60637, USA
russotto@eng.umd.edu (Matthew T. Russotto) (05/18/91)
In article <1991May17.160751.29252@midway.uchicago.edu> swsh@ellis.uchicago.edu (Janet M. Swisher) writes: >Just out of curiosity, have any of you ever tried attaching two >keyboards to the same Mac -- sort of like the extra steering wheel and >brake pedal in Driver's Ed cars? If you had a Mac with two ADB ports, >you could put a keyboard on each one, and daisy-chain the mouse so it >sits in the middle. Would this be likely to do something nasty like >frying the ADB port? I've never tried two mice, but two keyboards works fine. -- Matthew T. Russotto russotto@eng.umd.edu russotto@wam.umd.edu .sig under construction, like the rest of this campus.
mst@tsc.enet.dec.com (Mike Temkin) (05/19/91)
In article <1991May17.212220.200@eng.umd.edu> russotto@eng.umd.edu (Matthew T. Russotto) writes: >In article <1991May17.160751.29252@midway.uchicago.edu> swsh@ellis.uchicago.edu (Janet M. Swisher) writes: >>Just out of curiosity, have any of you ever tried attaching two >>keyboards to the same Mac -- sort of like the extra steering wheel and >>brake pedal in Driver's Ed cars? If you had a Mac with two ADB ports, >>you could put a keyboard on each one, and daisy-chain the mouse so it >>sits in the middle. Would this be likely to do something nasty like >>frying the ADB port? > >I've never tried two mice, but two keyboards works fine. >-- >Matthew T. Russotto russotto@eng.umd.edu russotto@wam.umd.edu > .sig under construction, like the rest of this campus. > As I recall from my ASC (Apple Support Coorinator) training, you can chain up to 32 devices per ADB port, 64 total. Each device will be assigned an ADB device number when the mac boots. At one point schools were going to use this to connect a mac to a large screen, chain keyboards off the ADB ports, and have students use special software written that would know which keyboard responded to what question. I don't think it ever happened though... I have some software called Serius Programmer that uses objects and flow control to write software. An improvement that I asked them to make is to the keyboard object. I wanted it to return not only the character, but the ADB device number as well. Let's see if they do it... Mike. My opinions are my own, no one else wants them...
francis@trillian.uchicago.edu (Francis Stracke) (05/20/91)
In article <3176@shodha.enet.dec.com> mst@tsc.enet.dec.com (Mike Temkin) writes: >As I recall from my ASC (Apple Support Coorinator) training, you can chain up >to 32 devices per ADB port, 64 total. Each device will be assigned an ADB >device number when the mac boots. Now they're telling us not to connect more than 3 ADB devices (maybe that's per port). :-( -- /============================================================================\ | Francis Stracke | My opinions are my own. I don't steal them.| | Department of Mathematics |=============================================| | University of Chicago | Should five percent appear too small, | | francis@zaphod.uchicago.edu | Be thankful I don't take it all. "Taxman" | \============================================================================/