Changes

* R46 (Write mask) in bitmap and standby modes is used when writing to physical VRAM0. * R47 (Write mask) in bitmap and standby modes is used when writing to physical VRAM1.* Testing indicates write mask takes effect just before writingwrite to VRAM is committed. * In So you need to know when each mask register is used and you need to understand the logical->physical VRAM mapping. ==== Write Mask in bitmap and standby modes this means even ==== * Even logical vram VRAM addresses which (logical address bit 0 = 0) map to VRAM0 and use R46 and odd for masking.* Odd logical vram VRAM address which (logical address bit = 1) map to VRAM1 use R47. So to know which mask is used when you need to understand the logical->physical vram mappingfor masking.