Also for a long time there was no need to do any kind of fine-grained synchronisation with the graphics hardware apart from usual IO wait states and tha whole t

Also for a long time there was no need to do any kind of fine-grained synchronisation with the graphics hardware apart from usual IO wait states and tha whole thing could be accessed as few memory mappings without any kind of interrupt handling (even to the extent of Sun's proprietary UPA slot not even supporting interrupts in it's low-cost graphics-only incarnation).