rg.jones@rogers.com wrote:
I was looking at the pinouts of the Apple IIc+ internal modem connector and I noticed pin 1 is labeled -5v. I am wondering what the designers motive would have been - why not +5 volts to power the modem circuit? Glenn
Modems require both polarity supplies to do RS-232 signalling. I'm sure you'll find +5v on the connector, too. -michael Music synthesis for 8-bit Apple II's! Home page: http://members.aol.com/MJMahon/ "The wastebasket is our most important design tool--and it is seriously underused."