first let me blow the dust off this thread... *sneeze*

It might have been a better idea to start a new thread than dig up one thats 9 months old

Quote Originally Posted by RubenR
I thought it would be simple to try to use the display test mode first. In this test-mode, all LED's will light up.

Main:
'Set the device address at the I2C-bus (datasheet page 10)
SlaveAddress = $50

The problem is that there is nothing happening. Does anybody know what I'm doing wrong?
Looks like you wanted slave address = $A0 not $50 ... i2c address uses the 7 most significant bits of a byte, leaving the LSB for the read/write indicator ... see page 7 on the datasheet under slave address for the nitty gritty details

so $50 = 0101000x , but you need $A0 = 1010000x

the command and command data look a-ok

looks like a really feature packed chip - hope to hear more about it!