lui@CS.UCLA.EDU (10/12/87)
The original Mac provided +5V and +12V from the modem port. I believe the Mac+
only provides +12V. What about the SE? I've been trying to use a Passport MIDI
interface on my Mac+ w/o success. I checked my modem port and it supplies +2.4V
on pin #6. If the Passport interface expects to get +5V or +12V, then it's out
of luck and that's why it doesn't work.
I measured the voltages from the modem port on a SE... Nothing!
Does anyone have the modem port pin-outs for the Mac 128K, Mac 512K, Mac 512KE
Mac+, and Mac SE?
I also have one of the very early Mac 128K's that's been upgraded to a Mac+.
I think I have one of the old power supply boards. Could that be the problems
with the 2.4V on pin #6?
Stephen Lui
UCLA Department of Computer Science and
Hughes Aircraft Company
2000 E. Imperial Hwy.
El Segundo, CA
(213) 305-2085
ARPA: lui@cs.ucla.edu
UUCP: ...!{cepu,ihnp4,trwspp,ucbvax}!ucla-cs!lui