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small doc update regarding spot ram

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This commit is contained in:
Michaël Banaan Ananas 2011-10-28 11:20:32 +00:00
parent ffa65b742d
commit 659b081960
2 changed files with 4 additions and 4 deletions
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4
src/mame/drivers/namcos22.c
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@ -2444,11 +2444,11 @@ static WRITE32_HANDLER( namcos22_mcuram_w )
} }
/** /**
* I don't know how "SPOT RAM" affects the display, yet. * Spot RAM affects how the text layer is blended with the scene, it is not yet known exactly how.
* I believe it's to support a "spotlight" effect, orthogonal to the polygon layer.
* It isn't directly memory mapped, but rather ports are used to populate and poll it. * It isn't directly memory mapped, but rather ports are used to populate and poll it.
* *
* See Time Crisis "SPOT RAM" self test for sample use. * See Time Crisis "SPOT RAM" self test for sample use.
* It is also used in Dirt Dash night section.
*/ */
#define SPOTRAM_SIZE (320*4) #define SPOTRAM_SIZE (320*4)

4
src/mame/video/namcos22.c
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@ -179,7 +179,7 @@ UpdateVideoMixer( running_machine &machine )
16,17,18 global fade rgb 16,17,18 global fade rgb
19 global fade factor 19 global fade factor
1a fade target flags 1a fade target flags
1b textlayer palette base? 1b textlayer palette base
1c 1c
1d 1d
1e 1e
@ -624,7 +624,7 @@ static void poly3d_DrawQuad(running_machine &machine, bitmap_t *bitmap, int text
*/ */
/* czattr: /* czattr: - assumed that it's write-only
0 2 4 6 8 a c e 0 2 4 6 8 a c e
^^^^ ^^^^ ^^^^ ^^^^ cz offset, signed16 per cztype 0,1,2,3 ^^^^ ^^^^ ^^^^ ^^^^ cz offset, signed16 per cztype 0,1,2,3
^^^^ flags, nybble per cztype 3,2,1,0 - 4 probably means enable ^^^^ flags, nybble per cztype 3,2,1,0 - 4 probably means enable