I'm arguing from the point of view that 'VRAM to VRAM' (or maybe "shared I/O RAM" in Amiga's case) is a subset of 'RAM to VRAM'. You seem to be arguing from the

I'm arguing from the point of view that 'VRAM to VRAM' (or maybe "shared I/O RAM" in Amiga's case) is a subset of 'RAM to VRAM'. You seem to be arguing from the point of view that just "RAM" in this context means non-video RAM. That's a fair assumption, and I understood it from your last post, but I don't think the difference is significant to the general point that we've had various forms of DMA-based 2D video acceleration for a long time.