Editing Atari 600XL (section)

== Memory ==
The Atari 600XL ships with:
* '''16 KB RAM''' – provided by either two 4164 (64K×1) DRAM chips or a single 4416 (16K×4) DRAM chip, depending on the board revision.
* '''24 KB ROM''' – split across two ROM ICs: a 16 KB OS ROM (Atari OS Rev. 1) and an 8 KB Atari BASIC Rev. B ROM.

The 16 KB RAM limitation is the 600XL's most significant drawback. Many commercial programs and games require a minimum of 48 KB to operate, rendering them incompatible without expansion. Atari addressed this with the '''Atari 1064 Memory Module''', an external unit that plugged into the PBI port on the rear of the 600XL to expand RAM to 64 KB. Third-party upgrades also became available, including internal modifications that replaced or supplemented the existing DRAM chips with 4464 or 4164 ICs to achieve 64 KB.