ComputerVoltageSources

--- In ComputerVoltageSources@yahoogroups.com, "drmabuce" <drmabuce@.
> (first off... like John i must confess my scope-envy.... dang....
> some poor guys only have money and good looks but your scope
> translates DATA!....... giant-geek-WOW!) 

For those with scope envy, I put a screen shot of the DPO4000 decoding 
the I2C bus in my photo album.  This was my experiment to send a 
single byte of data. As I thought, you can't easily.  You have to add 
the address as an extra byte of data (e.g. sending two bytes of data). 
The first address is ignored and the first byte of data is sent as the 
address.

Ignore the 'glitches' on the data lines.  I'm running about 3 feet of 
parallel cable out of my PSIM and over to my bench. My system 
grounding is also a mess. Short signals look fine.

The top traces are the captured waveform.  The yellow line is my Aux 
out which I use to measure the total time the i2cout command takes.  
The bottom waveforms are the zoomed image with the I2C protocol 
analysis displayed.

I also added a photo for a workspace concept using the I2C to greatly 
expand the I/O and display to a retro mega-system.

Dave