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Wait, what kind of analog TV signal allows for that kind of control? Are you sure that they didn't just scan out the same framebuffer twice?
by gmueckl 6y ago
Wait, what kind of analog TV signal allows for that kind of control? Are you sure that they didn't just scan out the same framebuffer twice?
- entropicdrifter 6y agoEssentially all pre-HD analog TVs allow for that kind of control. https://www.hdretrovision.com/240p https://www.hdretrovision.com/240p
- toast0 6y agoThe Analog TV doesn't have a framebuffer, and neither do most consoles, until you get into the 3d era. My understanding is that the timing of the vblank signalling that comes between fields determines weather the next field is an even field or an odd field. If the vblank signalling comes in the middle of the last scanline, the next field is an even field; if the vblank comes aligned with the end of the last scanline, the next field is an odd field. If you always start vblank signalling in the middle of a scanline, you get all even fields, if you always start vblank signalling at the end of a scanline, you get all odd fields.