Finally got my frame buffer working. Very RAM limited on this chip so it is 320x256 at 9 bits even though the hardware DACs are 1280x1024 12 bits.
Side-by-side of my FPGA 9bit frame buffer versus original image at 24 bits RGB.
Side-by-side of my FPGA 9bit frame buffer versus original image at 24 bits RGB.
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Instead of 512 CPU writes to draw "Sprite-Man", a single CPU write will relocate him anywhere on the 1280x1024 display.