To add to what Tcheko offered, AGA can do a resolution of 160x200x12bit high-color on NTSC by deactivating the display DMA and letting the Copper have the unused bus cycles. PAL does 160x256x12bit mode. The effect is called Copper Chunky on AGA and Copper Plasma on ECS and older. ECS is limited to 40x200x12-bit mode due to bandwidth limitations.
