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Rev Author Line No. Line
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
12 nishi 19 
			0x3: Debug
1 nishi 20 
 
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Video Mark I card maps itself to:
29 nishi 22 
	+0: VDP address
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	+1: VDP data
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	+2: See above
1 nishi 25 
 
7 nishi 26 
Video Mark II card maps itself to:
29 nishi 27 
	+0: VDG VRAM address
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	+1: VDG VRAM data
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	+2: See above
7 nishi 30 
 
1 nishi 31 
Sound Mark I card maps itself to:
29 nishi 32 
	+0: PSG address
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	+1: PSG data
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	+2: See above
1 nishi 35 
 
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Math Mark I card maps itself to:
29 nishi 37 
	+0: AM9511 stack
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	+1: AM9511 command (W) / AM9511 ready (R)
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	+2: See above
3 nishi 40 
 
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Text Mark I card maps itself to:
29 nishi 42 
	+0: Keyboard data
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	+1: Empty
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	+2: See above
12 nishi 45 
 
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Debug card maps itself to:
29 nishi 47 
	+0: Address
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	+1: LED
12 nishi 49 
		Bit to 7-segment map:
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		1 2
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		 3
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		4 5
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		 6 7
29 nishi 55 
	+2: See above