billygr/rtm-z80

Retro Tiny Multitasking system for Z80 based computers

RTM-Z80 - last update on 27 February 2022

RTM/Z80 is a multitasking kernel, built for Z80 based computers, written in Z80 assembly language, providing its users with an Application Programming Interface (API) accessible from programs written in the C language and the Z80 assembly language.

It is intended to be a simple and easy to use learning tool, for those who want to understand the tips and tricks of the multitasking software systems.

Current version is 2.3

RTM/Z80 will run, after setting the appropriate system parameters, on the following environments:

• CP/M running under Udo Munk's Z80SIM Z80 simulator (e.g. on Windows, under CygWin)

• RC2014 homebrew Z80 computer, with or without CP/M, using the following hardware configurations:

o SC112 + SC108(Z80 + 32KB SCM ROM + 2x64KB RAM) + SC110(CTC, SIO) (+ Digital I/O module)

o SC112 + any CPU Z80 board + Memory Module(32KB ROM + 2x64KB RAM) + SC110(CTC, SIO) (+ Digital I/O module)

o SC112 + any CPU Z80 board + 512KB RAM+512KB ROM Memory Module + SC110(CTC, SIO) (+ Digital I/O module)

For all other hardware, the I/O ports and interrupt levels must be set "by hand" (see manual, page 98: Porting RTM/Z80 to other hardware)

The only mandatory hardware requirement is the support of Z80 Interrupt Mode 2.

NOTE: CPM folder was moved to https://github.com/Laci1953/RC2014-CPM