The Dreamcast was the most documented Sega console, but also the most misunderstood. Technical Sega.blogspot.com would have set the record straight:
For example:
move.w #$8F02, (vdp_control).l ; Set DMA length high byte move.l #$94009300, (vdp_control).l ; Set DMA source address move.w #$9780, (vdp_control).l ; Trigger DMA VRAM fill Technical Sega.blogspot.com
Despite its success, Technical Sega.blogspot.com has faced several challenges over the years. One of the main challenges has been maintaining a consistent posting schedule, as well as ensuring that the blog remains relevant and engaging. The Dreamcast was the most documented Sega console,
Without that comment, modern emulation would still break at level 2. Set DMA source address move.w #$9780
The technical breakdown:
The blog would include a table of DMA priorities: