AA00 - Data Input/Output Register
AA01 - Command Register

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Commands:
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0x00: Set RB lo4

Arguments: RB lo4

----

0x01: Set RB hi1

Arguments: RB hi1

----

0x04: Set ?lo4

Arguments: ? lo4

----

0x05: Set ?hi4

Arguments: ? hi4

----

0x06: ? hi1

Arguments: 3210
           |||\- hi1?
           ||\-- R/#W?
           |\--- ?
           \---- ?

	?:

		0x05 - ?

----

0x07: ? lo4

Arguments: 3210


	0x00/0x01/0x02/0x03/0x04

----

0x08: Latch?

Arguments: 3210
           |
           \---- Latch bit?

----

0x0A: Status?

Return: 3210
        ||\/
        || \- Status
        |\--- ?
        \---- ?

	Status:

		00 - ?
		01 - Ready?
		02 - ?
		03 - ?

----

0x0C: Get ?lo4

Return: 3210

	?:

		0x0F - ?

----

0x0D: Get ?hi4

Return: 3210

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