Editing IBM 5110 (section)

== Architecture ==

The 5110 uses the same '''IBM PALM''' processor as the 5100 — a 16-bit board-level processor at 1.9 MHz with a 530 ns 2-byte cycle.<ref>https://en.wikipedia.org/wiki/IBM_PALM_processor</ref> Memory architecture also matches the 5100:

* '''Executable ROS''' — microcode + monitor in PALM's directly addressable 64 KB.
* '''Language ROS''' — APL and / or BASIC interpreters in a separate ROS address space; PALM accesses it as a peripheral.
* '''RWS (RAM)''' — 16, 32, 48 or 64 KB in 16 KB increments.

The PALM microcode includes the same System/370 and System/3 instruction-subset emulators as the 5100, used to run the unmodified APLSV and System/3 BASIC interpreters in their original object code.