Editing IBM 5100 (section)

=== Memory Organisation ===

The 5100 separates memory into three regions:

* '''Executable ROS''' — directly addressable by PALM in its 64 KB address space; holds the monitor program and microcode that controls the rest of the system.
* '''Language ROS''' — a separate ROS address space treated by PALM as a peripheral device. Holds the APL interpreter (a slightly modified APLSV from System/370) and / or the BASIC interpreter (a port of the System/3 BASIC). Several hundred KB total.<ref>https://en.wikipedia.org/wiki/IBM_5100</ref>
* '''RWS (Read-Write Storage)''' — main RAM, 16 / 32 / 48 / 64 KB user-installable.