Trying to read from 9150/AK8963's registers, but H isn't a hexadecimal number.

As the title says, I'm trying to read magnetometer data directly from the registers, but I don't' understand how the address system works for it. I pretty much understand that I'm going to have to address the mag directly as a separate device within the 9125 at O1H, then monitor the ST1 "data ready" bit at O2H to detect when I can read (mostly) as I did for the gyros and accelerometers. But how do I read/write to addresses like O1H and O4H? Is there some sort of conversion table I should be aware of?

addresses like O1H and O4H

The proper notation would be 0x01 and 0x04.

http://playground.arduino.cc/Code/BitMath

https://www.arduino.cc/en/Tutorial/BitMask

Ah, "H" as in "Hexadecimal". Not sure why they couldn't have just put that on the register map. Thanks.