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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.
The Genesis VDP has support for both vertical and horizontal scrolling, and they seem to be handled in different ways, but here I will only focus on horizontal scrolling. Horizontal scrolling can be performed in 3 different modes on the Genesis: Full screen scroll: The whole screen is scrolled uniformly
Sep 21, 2017 · Retro Development. Sega Genesis/Mega Drive VDP Graphics Guide v1.2a (03/14/17) Video controller chip that handles the Genesis' tile graphics, scroll planes, and sprites. Not actually a processor. H 40 mode - 320x224 px (40 x28 tiles). More common resolution mode. H 32 mode - 256x224 px (32 x28 tiles). Less common resolution mode.
Apr 2, 2010 · 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: "Here is some "C" pseudocode to illustrate how the VDP reads the scroll table depnding on the settings of bits 0 and 1 of register #11:
- A Quick Introduction
- Graphics
- Audio
- Games
- Anti-Piracy / Region Lock
Sega (and their TV ads) want you to know: Developers can’t come up with decent games unless the console provides faster graphics and richer sounds. Their new system includes lots of already familiarcomponents ready to be programmed. This means that, in theory, developers would only need to learn about Sega’s new GPU… right?
The answer is Blast Processing!, what else do you need to know? Okay, if you want to know the real answer: graphics data is processed by the 68000 and rendered on a proprietary chip called Video Display Processor(or ‘VDP’ for short) which then sends the resulting frame (in the form of scan lines) for display. The VDP runs at ~13 MHz and supports mu...
The audio capabilities of this console are a bit unorthodox, to say the least. On one side, the Mega Drive provides existing audio technology from the previous generation, on the other side, it adds a new (but complicated) synthesis technique on top of the existing one. So, in some ways, you get both generations. That being said, the Mega Drive hou...
Games are mainly written in 68000 assembly while the sound driver is implemented with Z80 assembly. Both reside in the cartridge ROM and can size up to 4 MB without the need for a mapper.
To block imported games, Sega slightly changed the shape of the cartridge slot between regions though it kept the same pinouts. Games could also perform ‘region locking’ by checking the value of the Versionregister (which outputs the region value). There were two easy ways to bypass this. First, by buying one of those third-party cartridge converte...
Aug 5, 2019 · 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.
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Does the Genesis VDP support horizontal scrolling?
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Apr 1, 2010 · Likewise, Genesis scrolling effects like those in Sonic 2's Aquatic Ruins, show more dynamic layers and more interactivity with player motion than games on other systems. It makes sense to find the capability hard coded in the VDP that this effect would be relatively unique to the Genesis and other systems built like it.
