Editing Atari 800XE (section)

== Architecture and Processor ==

The 800XE uses the '''MOS Technology 6502C''' (Sally) microprocessor running at '''1.77 MHz''' (PAL systems). NTSC versions of the 800XE are extremely rare; the machine was primarily a PAL-market product.

The system architecture is identical to the 65XE:
* '''ANTIC''' (CO21698) — Display list processor for video DMA
* '''GTIA''' (CO14889) — Graphics Television Interface Adaptor for colour video output
* '''POKEY''' (CO12294 / CO12294B) — Sound, keyboard, serial I/O, paddle input
* '''PIA''' (CO14795 / 6520) — Peripheral Interface Adaptor for joystick ports
* '''FREDDIE''' (CO61991 or CO61922) — Memory controller for DRAM timing and bus arbitration
* '''MMU''' (CO61618) — Memory Management Unit (PAL-based address decoder)

Unlike the [[Atari 130XE]], the 800XE does '''not''' include an EMMU chip, as it has only 64 KB of RAM with no bank-switching capability.