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1 nishi 1 
I/O List
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If the I/O port (3n-1) returns 0, card is not there.
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I/O port (3n-1) returns the card type.
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	Top 4 bits mean the card genre:
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		0x0: Video
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		0x1: Audio
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		0x2: Math
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	Bottom 4 bits mean the card type:
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		Video:
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			0x1: Video Mark I
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		Audio:
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			0x1: Sound Mark I
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		Math:
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			0x1: Math Mark I
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Video Mark I card maps itself to:
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	0: VDP address
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	1: VDP data
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	2: See above
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Sound Mark I card maps itself to:
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	3: PSG address
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	4: PSG data
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	5: See above
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Math Mark I card maps itself to:
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	6: AM9511 stack
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	7: AM9511 command
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	8: See above