The original Epyx Lynx documentation has been converted to HTML format by Mattias Domin and Bastian Schick in 1996. It's a must read if you want to understand how Atari Lynx works at a deeper level.

See the original scanned PDF file here - Handy Specifications.pdf.

1. General Overview
2. Hardware Overview
3. Software Related Hardware Perniciousness
4. CPU/ROM
5. Display
6. Sprite/Collision
7. Audio
8. Magnetic Tape
9. ROM Cart
10. Timers/Interrupts
11. UART
12. Other Hardware Features
13. Expansion Connector
14. System Reset/Power Up
15. Definitions and Terminology
16. Known Variances From Anticipated Optimums
17. Approved Exemptions
18. Common Errors
19. SaveGame-Option

• Appendix 1. System Bus Interplay
• Appendix 2. Interrupts and CPU Sleep
• Appendix 3. Hardware Addresses
• Appendix 4. Sprite Engine

• Hardware Notes
• Cartridge Pinout