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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 ...
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.
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.
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:
§ 8 scroll. 39 _ screen size 40 _ horizontal scroll 41 _ yertical scroll 43 _ scroll pattern 45 _ pattern name 46 § 9 window. 48 _ position 49 _ priority 52 _ pattern name 52 § 10 sprit_e. 54 _ position 54 _ attribute 56 _ size 57 _ ability 57 _ priority (sprites) 58 _ pattern generater 60 § 11 priority. 61 § 12 color palette. 67
May 18, 2019 · As you have probably seen in previous consoles, this allows the CPU to work on the next frame (or alter the current one). Conventionally, there are two types of interrupts called: H-Blank (every horizontal line) and V-Blank (every frame). H-Blank is called numerous times but is limited to executing short routines.
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Oct 18, 1995 · software to run on the Sega Genesis. The system consists of a 4 inch by 8. inch printed circuit board that plugs in the cartridge slot of the Genesis, and has a cable going to the parallel port of the host computer. A complete. software set is included consisting of an integrated editor/assembler, a.
