STN-25

When using palette-style sprites in VDP1

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When using palette-style sprites, the picture may not be displayed depending on the palette code and color bank values. This is because the dot data is judged as VDP2 shadow function dot data (normal shadow data).

The sprite data judged as normal shadow data is as shown in the attached table depending on the splat type set in VDP2.

List of normal shadow data by sprite type

Sprite type	Number of colors	Palette code	Color bank
Types 0-3, 5	16 64 128 256	1110 xx11 1110 x111 1110 1111 1110	xxxx x111 1111 0000 xxxx x111 11xx 0000 xxxx x111 1xxx 0000 xxxx x111 xxxx 0000
Types 4, 6	16 64 128 256	1110 xx11 1110 x111 1110 1111 1110	xxxx xx11 1111 0000 xxxx xx11 11xx 0000 xxxx xx11 1xxx 0000 xxxx xx11 xxxx 0000
Type 7	16 64 128 256	1110 xx11 1110 x111 1110 1111 1110	xxxx xxx1 1111 0000 xxxx xxx1 11xx 0000 xxxx xxx1 1xxx 0000 xxxx xxx1 xxxx 0000
Types C to F	16 64 128 256	1110 xx11 1110 x111 1110 1111 1110	xxxx xxxx 1111 0000 xxxx xxxx 11xx 0000 xxxx xxxx 1xxx 0000 Not relevant
Type 8	16 64 128 256	1110 xx11 1110 x111 1110 1111 1110	xxxx xxxx x111 0000 xxxx xxxx x1xx 0000 Not relevant
Type 9-B	16 64 128 256	1110 xx11 1110 x111 1110 1111 1110	xxxx xxxx xx11 0000 Not related Not related Not related

reference

"HARDWARE MANUAL / VDP2 User's Manual" ■ 9.1 Sprite data
" ● Normal shadow sprite"