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Rev 3 Rev 7
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		0x1: Audio
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		0x1: Audio
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		0x2: System
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		0x2: System
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	Bottom 4 bits mean the card type:
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	Bottom 4 bits mean the card type:
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		Video:
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		Video:
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			0x1: Video Mark I
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			0x1: Video Mark I
- 
 
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			0x2: Video Mark II
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		Audio:
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		Audio:
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			0x1: Sound Mark I
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			0x1: Sound Mark I
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		System:
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		System:
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			0x1: Math Mark I
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			0x1: Math Mark I
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			0x2: Text Mark I
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			0x2: Text Mark I
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Video Mark I card maps itself to:
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Video Mark I card maps itself to:
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	0: VDP address
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	0: VDP address
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	1: VDP data
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	1: VDP data
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	2: See above
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	2: See above
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- 
 
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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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Sound Mark I card maps itself to:
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Sound Mark I card maps itself to:
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	3: PSG address
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	3: PSG address
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	4: PSG data
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	4: PSG data
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	5: See above
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	5: See above
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