In message <19980419195311.45688@antares.apana.org.au>,David Johnston writes:
>The fast block copying doesn't work at all. The screen stops updating
>properly after the code which enables this is executed - though the machine
>otherwise still works fine. When this happens pixels stop changing from
>...
>copying to vram then the video works again.

i experienced the same behavior on my quadra 800.  the 'fast block' enable
doesnt seem to work.  i applied to patch to a 1.3.1 stock kernel and was
running in 1024x768 b/w mode.  the only vram in the machine is what came
on the motherboard.