Darrel, I've tried 1k, 2k, 4.7k and 10k. I get a more well-defined square-wave with a 1 or 2k, but I still have the same result. I don't think the 24LC256 is being written to or read.

Jerson, I've looked at the 16F877 datasheet and found the first six bits of the SSPCON register and the first seven bits of the SSPCON2 register. Also, the requirement to set C.3 and C.4 as inputs with TRISC.

A lot of pages of the datasheet are devoted to I2C. Although PIC Basic Pro makes I2C a "no brainer", the data sheet suggests using assembler isn't so easy. I only have a small amount of assembler experience with an 8051.

I'll try configuring registers with PBP, but once I use the I2CWRITE and READ commands, won't PBP do it's own configuration, changing prior configurations?