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Originally Posted by PiCiJi
From Denise's (OCS) point of view, blanking means "only" the disabling of the RGB output, so that the front/back porch region around HSync (Beam Retrace controlled by Agnus) does not get any data ?
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Yes, the same of course also applies for vblank, usually lines from 0 to 20 NTSC or 25 PAL, which covers vsync pulses and a cushion zone used on TV for extra-data.
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By the way, I have set the hardwired blanking to Denise Hpos 14 to 84.
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A little too optimistic here
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With DIW fully open visible lores pixels are 376, so the first pixel is at 92 ($5c).