AV Mods
Most pre-NES consoles offered only RF output, and can be difficult to modify. Almost every post-NES system had a wealth of video options, most offering at least composite video output, and many easily hacked to allow RGB output, and sometimes S-video. On this page you'll find the GameSX library of video hacks - some useful, some trivial, and some downright evil. All, however, will grant you better quality images than you're seeing now.
When Lawrence started GameSX.com back in ~1996 there were no sources for this information online. Gopher was still vying with the infant WWW as the most useful resource, and GameSX.com - originally intended to be a website for Game Station X (Lawrence's store) was instead a repository of knowledge gleaned from obscure sources and trial and error (mostly the latter).
Video Adaptors
Consoles
Colecovision
Mattel Intellivision
Nintendo GameCube
GameCube RGB - How to modify a Nintendo GameCube component video cable to make it output RGB.
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Nintendo 64
Nintendo NES
NESRGB board - Provides RGB, S-video and composite video output using the original PPU
Universal PPU - An FPGA-based replacement for the PPU that outputs VGA, RGB, component, S-video and composite (in-progress)
NES RGB++ - NES RGB amplifier with external LPF
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Philips G7000 Videopac
Nintendo SNES
SNES mini RGB - the newer, smaller SNES did not include RGB (or S-video). Here's how to get your RGB back.
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Sony PlayStation
PlayStation 1 Sync - For those who would rather get the sync off of the motherboard than use sync chips.
Sony PlayStation 2
Computers
ZX Spectrum
Atari 8-bit
Amstrad CPC
MSX
Commodore 64/128
Commodore PET
Classic IBM PC