Description CTIA ("Color Television Interface Adapter") / GTIA ("George's Television Interface Adapter") is a television interface chip. ANTIC directly controls most of GTIA's operations, but the 6502 can be programmed to intercede and control some or all of GTIA's functions. GTIA converts the digital commands from ANTIC (or the 6502) into the signal that goes to the television. GTIA also adds some factors of its own, such as color values, player-missile graphics, and collision detection. CTIA artifacts in blue/green, GTIA in 400/800 artifacts in green/blue and GTIA in XL/XEs artifacts in red/blue. It's said that all PAL GTIAs are missing one red color, which is substituted by doubled brown color. Indeed, my tests show, that first color (#1) and last color (#15) are very similar or same. Latest PAL GTIAs from China have annoying bug in 'GTIA modes', where some bits are displayed with high luminance. I have one report of such chip, it's production week is 9120 (end of May 1991). Catalogue numbers CTIA CO12295 GTIA CO14889 PAL CO14805 NTSC CO20120 SECAM Pinout A0-A4 address bus D0-D7 data bus AN0-AN2 ANTIC bus Vcc +5V power T0-T3 joystick trigger inputs S0-S3 console inputs PAL PAL clock input CAD3 color delay line adjustment input (sometimes called DEL) COLOR color signal output LUM0-LUM3 luminance signal output CSYNC composite sync output /HALT for synchronizing ANTIC & GTIA (when low and in HBLANK, pmg data on bus will follow) Vss Ground OSC main oscillator input F0O fast phase 0 output Ø2 phase 2 input CS chip select R/W read/write Back (c) 1998-2004 Jindroush Last modified: Mon Feb 17 12:21:56 2003