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Hello... Wow, that's odd. Thanks for reporting!
You mean then that it is impossible to disable only the pattern layers A
and/or B and leave the sprites active?
Paulo
Hi guys, me and some fellows on MSX.org found a bug on the V9990 implementation, more specifically on R#22:
The two higher bits (bits 7 and 6) are supposed to disable layers AND sprites, not just the tile patterns layer.
The documentation states:
SDA: Set to "1" to disable layer "A" and sprites.
SDB: Set to "1" to disable layer "B" and sprites.
The discussion can be viewd here (page 4 onwards).
If necessary I can provide a test ROM showing the bug.
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