CTIA / GTIA Pinout Diagram

A vector graphic pinout is also available in Encapsulated PostScript format.

Key

• A0-A4: Address bus
• D0-D7: Data bus
• AN0-AN2: ANTIC bus (data type unknown)
• Vcc: +5V power
• T0-T3: Joystick trigger inputs
• S0-S3: Console buttons - Start, Select, Option, ? (?)
• PAL: PAL/NTSC indicator (R/W direction unknown)
• CAD3 (unknown)
• COLOR: Color signal to TV modulator (?)
• LUM0-LUM3: Digital luminance signal to TV modulator (?)
• CSYNC: (unknown)
• HALT: (usage unknown)
• Vss: Ground (?)
• OSC: Output to console speaker (?)
• F0O: (unknown)
• Ø2: Clock in (?)
• CS: Chip select
• R/W: Read/write direction

Note: I have no confirmation of the above descriptions. This is just my best educated guess, using my knowledge of microcomputer design, the function of the C/GTIA processor, and the interaction between the custom IC's.

Back to Atari Technical Information page