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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteRetro consoles used dedicated video chips to build each picture from reusable tiles, maps, and hardware sprites as the screen was drawn line by line. Rather than asking a modern-style programmable GPU to render a whole scene, games arranged compact graphics data and let specialized circuitry fetch and combine it.
How a console built a picture as the TV displayed it
A television image is a raster: the display is produced one horizontal line at a time. A console’s video processor could fetch the graphics data needed for each part of that image, combine backgrounds and objects, and send the resulting picture to the display. The CPU still ran game logic and updated data, but it did not have to calculate every visible pixel from scratch.
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This was a specialized, largely fixed-function approach: the video hardware performed a defined set of graphics operations. It is different in kind from the broad programmability and throughput associated with modern GPUs. There is no single universal date at which consoles crossed from one category to the other; designs varied across systems.
Tiles and maps made large backgrounds practical
Reusable patterns instead of a full-screen painting
A tile is a small graphic pattern reused in a scene. A tile map, or tilemap, lays out which pattern belongs in each background cell and can include display attributes such as palette, priority, or flips. Reuse meant a game could construct a large-looking world from a relatively compact set of patterns instead of storing every screen as a separate image.
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The NES used 8×8-pixel background tiles stored in pattern tables and arranged them into scrolling backgrounds. Its nametables recorded the arrangement; games could update map entries as the view moved, and cartridge mappers could swap tile data or pattern banks. Sprites.org’s NES technical reference describes this tile-and-map approach.
Fetching the map during the raster
On the SNES, each background was also built from a tilemap. As the picture was scanned line by line, the PPU read map information and fetched tile graphics from VRAM. The system supported multiple background layers, giving games more ways to combine scenery and foreground elements. Sprites.org’s SNES map reference explains the map, tile-data, and scanline process.
Sprites let hardware draw moving objects
Sprites were separately positioned graphics commonly used for characters, enemies, and projectiles. The game described each object’s tile, position, palette, and display options; the video hardware then placed it over or among the background graphics. This spared the CPU from constructing each moving object pixel by pixel.
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On the NES, the PPU used object attribute memory (OAM) to read sprite properties such as tile, location, palette, and flipping. The hardware could store 64 sprite entries, but only eight sprites could appear on a scanline, according to Sprites.org’s NES sprite reference. That per-line bottleneck could force developers to prioritize objects or manage how many crossed the same horizontal strip.
The SNES used an OBJ/OAM sprite system with priority settings that controlled how objects related to background layers. Its documented limits were 32 sprites and 34 sprite slivers per scanline; a sliver is a portion of a sprite considered during rendering. These are distinct limits, not interchangeable counts. See the SNESdev Wiki’s SNES sprite reference.
Scanline limits help explain why some games flicker objects or leave them out when too many compete for display, but the cause of any particular game’s flicker should not be assumed without game-specific evidence.
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Scrolling and raster effects changed the picture in motion
Ordinary scrolling often worked by changing a background’s map offset: the tile world moved beneath the visible window. Developers could also update scroll or display settings while a frame was being drawn. If the setting changed between scanlines, different parts of the image could use different values, producing effects such as wavy scenery or split-screen views.
The SNES map reference describes per-scanline scroll updates and moving map data into VRAM during vertical blanking, the interval between displayed frames when updates could be made. The SNESdev Wiki’s PPU guide notes that mid-screen scroll changes and similar raster effects were easier on SNES than on NES. Such effects relied on timing and careful updates, not on a general-purpose GPU rendering a new scene.
What changed between NES and SNES?
Both systems used tile-based backgrounds, hardware sprites, and a video processor that assembled output as the display raster advanced. The SNES added more background-layer flexibility and made certain mid-frame display changes easier. These examples show a progression, not a template shared by every retro console.
| Graphics feature | NES | SNES |
|---|---|---|
| Background organization | 8×8 tiles arranged in nametables; scrolling backgrounds. Source: Sprites.org. | Multiple backgrounds built from tilemaps; the PPU reads map and tile data during scanout. Source: Sprites.org. |
| Sprite limits | 64 OAM entries and up to eight sprites on a scanline. Source: Sprites.org. | 32 sprites and 34 sprite slivers per scanline. Source: SNESdev Wiki. |
| Raster flexibility | Raster changes were possible, but less convenient than on SNES. Source: SNESdev Wiki. | Per-scanline scroll updates and mid-screen changes enabled effects such as wavy or split-screen views. Sources: Sprites.org and SNESdev Wiki. |
The Sega Master System is another example of a tile-and-sprite design: a Carnegie Mellon University lecture on console architecture describes its backgrounds and sprites as tile-based. That lecture provides a useful additional case, not a complete comparison across console generations: Carnegie Mellon University, Visual Computing Systems.
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