Display timing



In NTSC mode, the display is 320x224 pixels. In PAL mode, it is 320x256 pixels (16 pixels more at the top and bottom).

Upper 9 bits of register :
 * $00F8-$00FF : Vertical sync (8px)
 * $0100-$010F : Top border (16px)
 * $0110-$01EF : Active display (224px)
 * $01F0-$01FF : Bottom border (16px)

Corrected from and added on to mvstech.txt (by Charles MacDonald). mclk refers to the 24MHz master clock. A pixel is output every 4 mclk.

Horizontal timing



 * 112 mclks (28px) H-sync
 * 112 mclks (28px) back porch
 * 1280 mclks (320px) active display
 * 32 mclks (8px) front porch
 * 256 mclks (64px) total horizontal blanking
 * 1536 mclks (384px) total per scanline

CHBL tells NEO-B1 to output color 0 of palette 0, which is the reference color.



BNKB (blanking to 0V) changes state 14px after H-sync (middle of the back porch)

Vertical timing
There are 264 scanlines per frame:


 * 8 scanlines vertical sync pulse
 * 16 scanlines top border (visible in PAL)
 * 224 scanlines active display
 * 16 scanlines bottom border (visible in PAL)

Frame timing
The exact framerate is 6 MHz / 384 / 264 = 59.18 Hz