Even as late as the Amiga you got stuff like that. To this day you can probably find a PPC based accelerator for all models.
I guess the close to the metal, with little to no memory protection barriers, made these kinds of things easy to implement.
That said, some early GPUs were somewhat similar.
The 3DFX cards used pass through VGA cabling. And i personally owned a PowerVR card that wrote rendered frames back to the graphics card over the PCI buss.
I guess the close to the metal, with little to no memory protection barriers, made these kinds of things easy to implement.
That said, some early GPUs were somewhat similar.
The 3DFX cards used pass through VGA cabling. And i personally owned a PowerVR card that wrote rendered frames back to the graphics card over the PCI buss.