Optimal timings

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Console / mode Dots per scanline / no. scanlines / @dotclk OSSC base mode Modified parameters Notes PC modeline
NES 256x240 @60.10Hz 341 / 262 / @5.37MHz(NTSC) [1][2] 256x240 To reduce jitter in couple topmost lines, try disabling ""Allow TVP HPLL2x" and/or using mask.
Modeline "ossc_nes_1280x720_60.08"  80.55  1280 1385 1510 1705  720 729 738 786  -hsync -vsync
SNES 256x239/224 @60.10Hz 341 / 262 / @5.37MHz(NTSC) @5.32MHz(PAL) [3] 256x240
Modeline "ossc_snes_1280x720_60.08"  80.55  1280 1385 1510 1705  720 729 738 786  -hsync -vsync
Mega Drive 320x224 @60Hz 427 / 262 / @? 320x240 H.samplerate=427
Mega Drive 256x224 @60Hz 341 / 262 / @? 256x240
N64 320x240 @60Hz 773.25 (?) / 262 / @12.18MHz(NTSC) [4] 320x240 H.samplerate=387, H.synclen=22, H.backporch=36 Every other visible dot (of 640) is interpolated
PSX 320x240 @60Hz 426.625 (?) / 263 / @6.71MHz(NTSC) @6.65MHz(PAL) [5] [6] 320x240 -
Saturn 320x240 @60Hz 427 / 262 / @6.71MHz [7] 320x240 H.samplerate=427
DC VGA @60Hz 858 / 525 / @27MHz [8] 480p H active=640
GBI ULL 480p @59.72Hz 866 / 522 / @27MHz ? 480p H samplerate=866 ?
CPS2 384x224 @59.64Hz 512 / 262 / @8MHz 320x240 H.samplerate=512, H.active=384, H.backporch=66
PC-98 640x400 @56.4Hz 848 / 440 / @21.0526MHz 640x384 H.samplerate=848, H.backporch=80, H.synclen=64,, V.active=400, V.backporch=25
Seibu SPI ? / 293 (?) ?


Horizontal multiplication factors

Frame width is multiplied by an integer factor defined below while picture area is multiplied by the value in parenthesis to maintain correct aspect ratio. Vertical multiplication factor is defined directly by line multiplication mode. For example, consider 320x240 in line3x mode. Frame size is multiplied by 4 in horizontal direction, and by 3 in vertical direction to generate a frame of 1280x720 which is ideal for 720p output. However, picture area is multiplied by 3 in both directions so that effective area (960x720) maintains 4:3 ratio of the source.

320x240 256x240 (4:3) 256x240 (8:7)
Line3x 4x(3x) 5x(4x) 5x(3x)
Line4x 4x 5x 5x(4x)
Line5x 5x* 6x* 6x(5x)*
  • With Line5x, horizontal active and mask are adjusted internally so that frame width of 1600 or 1920 (depending on "Line5x format") is always generated. In 1920x1080 format, vertical active and backporch are also internally adjusted (-24 and +12) to generate suitable frame height.