Using open drain or symetric pins when interfacing to IIC devices
See also:
http://www.phanderson.com/PIC/16C84/24lc65.html
(
cached 19991214
)
http://ken.webster.org/picee.txt
code for a PIC 16C74 talking to a 24C65. good example of using ordinary (not open drain) outputs
http://kdsl32.dnvr.uswest.net/cgi-bin/tl2.exe/MPLAB/GPSPOS/main.asm