A selection of manuals that were not published in these early forms.
- RISC OS Style Guide - A RISC OS 2 era style guide, never released. (RISC OS Style guide first published for RISC OS 3)
- RISC OS Programmer's Reference Manual - RISC OS 3.00 era, 6 volume set. A 4 volume set was released for RISC OS 3.1
- RISC OS 3 Programmers Refernece Manual, Volume 5 - For RISC OS 3.5, but refereed to as RISC OS 3.X here.