This is what I get with your suggestion:
Code:
EeCtrl=$a0 + 2 ;using block 1 ie 1<<1=2
    i2cwrite SDA,SCL,EeCtrl,0,[1,2,3,4,5,6,7,8]
EeWP = 1
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Something is also even more confusing to me. As you wrote, the address has to be WORD sized - this is also stated in the DS.

In my code, I have it ("EeCtrl") as a BYTE. If I change it to a WORD, it doesn't make any difference.

Your last suggestion with a WORD sized EeCtrl var gives this result:

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Maybe I'm messing things up in the I2CWRITE command because I understand it this way and both vars (EeCtrl and EeAddress) are looking to be BYTE long:
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To be honnest, I don't get that thing with the WORD sized address...