A Little off the Top
Internal expansion on the Atari 800 was limited to the four internal card slots shown above, positioned beneath a removable panel above the cartridge ports. Atari sold user-friendly "Memory Modules" (available in 8KB and 16KB sizes) that could be inserted and configured to a maximum RAM capacity of 48KB in three slots. The slot closest to the keyboard was always reserved for 10KB of ROM containing the simple but necessary Atari operating system.
Republished with permission from PC World (view original version)