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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
3 nishi 9 
		0x2: System
1 nishi 10 
	Bottom 4 bits mean the card type:
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		Video:
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			0x1: Video Mark I
7 nishi 13 
			0x2: Video Mark II
1 nishi 14 
		Audio:
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			0x1: Sound Mark I
3 nishi 16 
		System:
1 nishi 17 
			0x1: Math Mark I
3 nishi 18 
			0x2: Text Mark I
1 nishi 19 
 
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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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7 nishi 25 
Video Mark II card maps itself to:
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	0: VDG VRAM address
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	1: VDG VRAM data
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	2: See above
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1 nishi 30 
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
11 nishi 37 
	7: AM9511 command (W) / AM9511 ready (R)
1 nishi 38 
	8: See above
3 nishi 39 
 
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Text Mark I card maps itself to:
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	9: Keyboard data
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	10: Empty
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	11: See above