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| 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. Only the 600XL and 800XL computers had a PBI. XE systems came with the Enhanced Cartridge Interface (ECI), a functionally similar connection. DetailsDuring coldstart, the Atari OS polls for parallel bus devices. If found, it'll load handler (aka driver) information into its handler table and initializes the parallel bus device, if needed. The device can utilize the Generic Parallel Device Handler that's already provided once the address is loaded into the handler table.The device connected to the parallel bus gets its ROM space mapped to the OS Floating-point package subroutines and tables. While the device is selected, no floating-point operations can take place. Once de-selected, the floating-point routines are restored. Devices
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