actually it means device 0 talk register 3, its the very first command the mac sends when starting up, and after rearranging my startup and and speeding up code I can now start the mac, which also starts the mcu, sample the native adb signal for timing (within 8 microseconds), calculate all the timing needed, and decode the command byte before it hits the second poll every time

|)

next its just a matter of waiting for the command I want to respond to and tell it YES there is a mouse / kb here (talking to the mac ought to be fun), once I get stuff talking its just going to get easier, then I can deal with sissy stuff like "collision"