PIA Pinout Diagram

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

Key

• Vss: Ground
• PA0-PB7: Bidirectional ports A and B (stick direction, paddle triggers, etc.)
• CB1-CB2: Port B control
• Vcc: +5V power
• R/W: Read/write direction
• CS0: Chip Select
• CS2: Chip Select (active low)
• CS1: Chip Select
• Ø2: Sync
• D0-D7: Data bus
• RST: Chip reset
• A0-A1: Address bus
• IRQA-IRQB: Port A and B interrupt lines
• CA1-CA2: Port A control

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 PIA processor, and the interaction between the custom IC's.

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