The Parallel Bus Interface, or PBI, is a 50-pin port found on some Atari 8-bit XL computers. It provides unbuffered, direct connection to the system bus lines (address, data, control), running at the same speed as the 6502 CPU. The 600XL and 800XL computers, along with the unreleased 1400XL and 1450XLD had a PBI interface. The 130XE system came with the Enhanced Cartridge Interface (ECI), a functionally similar connection.
Read more about Parallel Bus Interface: Details, Pinout, Devices
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