Editing Atari 130XE (section)

== Memory and Storage ==

The Atari 130XE is equipped with:
* '''128 KB RAM''' — organised as 16 × 64Kbit (4164) DRAM chips on early boards (CO70065/CO70067) or 4 × 256Kbit (4464/41464) DRAM chips on later cost-reduced boards (C103579)
* '''24 KB ROM''', comprising:
** 16 KB for the operating system (Atari OS Rev. 2 or Rev. 3)
** 8 KB for Atari BASIC (Revision C)

The extra 64 KB of RAM beyond the base 64 KB is accessed via bank-switching controlled through PIA port B (address $D301). Four 16 KB banks can be mapped into the $4000–$7FFF window, accessible to either the CPU, ANTIC, or both. This extended memory is commonly used as a RAM disk under Atari DOS 2.5 and later DOS versions (e.g. SpartaDOS).

Storage options include:
* '''Cassette tape drive''' (Atari 410/1010)
* '''5.25" floppy disk drive''' (Atari 1050, XF551, Indus GT)
* '''Cartridge slot''' for instant program loading (up to 16 KB standard, larger with bank-switching)