: RAM was initially 16K but later increased to a standard 48K for the Atari 800. Custom Chips :

If you need to view the manual or related technical documents, they are preserved on several vintage computing sites: Atari 800XL Service manual - AtariMania

: Electrical drawings and PCB layouts for the motherboard, power supply, and other major internal components.

The manual covers the hardware released between late 1979 and 1983. Key specs include: : MOS Technology 6502A/C.