move.b #1,REG_DISBLSPR
move.b #1,REG_DISBLFIX
=> black screen with random pixels
move.b #0,REG_ENVIDEO
=> black screen without random pixels
maybe its possible to disable screen in every 2nd line... this will look like scanlines
but we can update & use more colors. I will this tomorrow on real hardware..another idea: (needs REG_LSPCMODE timer)
- disable screen at bottom of chunky-screen
- copy all 250 palettes (dont wait for VBL)
- enable screen at top of chunky-screen