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Horizontal scrolling can be performed in 3 different modes on the Genesis: The full screen scroll is simple enough, every pixel is offset horizontally with the same amount (see the Mega Turrican GIF for an example). It only requires updating one number every frame, the offset. The line scroll is more powerful, as every line on the screen can be ...
Mar 31, 2010 · The "Horizontal Scrolling" section implies that the VDP handles locally whether either background A or B is scrolled full screen, split at the first 8 lines and then full screen, individual 8 line rows, or individual lines. If this is the case, it also implies that the 68000 is impacted by the effect of "parallax" very little or not at all.
Sep 21, 2017 · Planes can use 1 of 3 different, scroll modes: by scanline, by tile, or block (a section of 2x2 tile). Each plane can be scrolled horizontal, vertically, or both. COLOR. Mastering the Genesis’ color restrictions is probably the best thing you can do to get the most out of your graphics! Tiles can only make use of 1 of 4 palette lines at a time.
Apr 2, 2010 · All of the register entries, in both Genesis Technical Documentation 1.0 and MacDonald's genvdp.txt, make no mention of per frame updating. Genesis Tech Doc makes it sound like you just set the speed of each scroll once, but neither fully explain the process (pg 48). Macdonald describes it like this under the Horizontal Scrolling section:
_ VSRAM (Vertical scroll RAM) _ Up to 20 different vertical scroll values each for scrolling play fields A and B. _ DMA (Direct Memory Access) _ The VDP may move data at high speed from CPU memory to VRAM, CRAM, and VSRAM instead of the CPU, by taking the 68000 off the bus and doing DMA itself. The VDP can also fill the VRAM with a constant, or ...
• 2 scrolling playfields • 1 sprite plane • definable priorities between planes - Playfields: • 6 different sizes • 1 playfield can have a "fixed" window • playfield map - each char position takes 2 Bytes, that includes: • char name (10 bits); points to char definition • horizontal flip • vertical flip
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Sep 22, 2024 · Enhanced per-tile vertical scroll [genesis_plus_gx_enhanced_vscroll] Allows each individual cell to be scrolled vertically, instead of 16px 2-cell, by averaging out with the vscroll value of the neighbouring cell. This hack only applies to few games that use 2-cell vertical scroll mode. Off [disabled] - Enables enhanced per-tile vertical scrolling.
