swetland@chaos.social on Twitter: "Some context for this keyboard project. Attached photos of the Atari 800XL mainboard (note the 1x24 2.54mm pitch flex connector at the right, near the joystick ports) and keyboard
atari 800xl mobo | Old ads, Computer, Atari
Purchase and Install an Ultimate 1MB Board for Your Atari 800XL (1-3 hours) – Atari Projects
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Motherboards - Atarinside
Purchase and Install an Ultimate Atari Video (UAV) Board for Better Composite Video from an 800XL (1-3 hours) – Atari Projects
New pcb for 800XL? It exist. - Atari 8-Bit Computers - AtariAge Forums
Atari 800xl repair log #2 – JAMMArcade.net
How to upgrade your Atari with Ultimate 1MB, Stereo and Sophia DVI