[Openmsx-bugs] [ openmsx-Bugs-2804280 ] v9990 palette mode b4 to b7

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Bugs item #2804280, was opened at 2009-06-10 18:46
Message generated for change (Comment added) made by m9710797
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Category: Graphics
Group: None
>Status: Closed
>Resolution: Fixed
Priority: 5
Private: No
Submitted By: Delorme Marcel (emesde)
Assigned to: Wouter Vermaelen (m9710797)
Summary: v9990 palette mode b4 to b7 

Initial Comment:
The v9990 has to have two palettes containing the same values in mode b4 to b7. This means that color 32 to 47 has to have the same contains as 0 to 15.

G9klib code example:

	LD	A,(currentMode)
			CP	A,G9K_MODE_B4
			RET	C
			
			; Copy palette for b4 to b7 
			LD	B,16*3
			LD	C,0
			LD	HL,(freeRamAddr)
			PUSH	HL
			CALL	G9k.ReadPalette
			POP	HL
			LD	B,16*3
			LD	C,4*32
			JP	G9k.WritePalette

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>Comment By: Wouter Vermaelen (m9710797)
Date: 2009-07-24 21:44

Message:
Implemented in revision 10260.

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Comment By: Delorme Marcel (emesde)
Date: 2009-06-10 21:15

Message:
the bpp doesn't matter.  The v9990 manual actually says that 0 to 31 should
be the same as 32 to 63. But because b4 to b7 only support upto 4bpp it
doesn't really matter if 16 and 33 etc are the same or not.

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Comment By: Wouter Vermaelen (m9710797)
Date: 2009-06-10 20:55

Message:
I can confirm this bug. I see now that I even made some notes about this in
my v9990 datasheet (on paper). But apparently I never got around to
implementing it in openMSX.
Do you know by heart how this behaves in 2bpp palette mode? Are it also
the odd/even pixels with a separate palette or are there 4 palettes (colors
0-3, 16-19, 32-35, 48-51)?

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Comment By: Delorme Marcel (emesde)
Date: 2009-06-10 20:10

Message:
Some more info. This is not an undocumented feature. it's clearly noted in
the manual. 

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Comment By: Delorme Marcel (emesde)
Date: 2009-06-10 18:54

Message:
Almost forgot to mention that the even pixels use palette values 0 to 15
and odd 32 to 47

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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=421861&aid=2804280&group_id=38274