Some applictations and tests made with Retro-Assembler and VS-Code for old (1983 and 1984) Z80 boards.
https://www.z80cpu.eu/mirrors/oldcomputers.dyndns.org/public/pub/manuals/info.html
and
To find Google Search: mc-Grafik-Terminal or at http://www.vintagecomputer.net/
Here are some little apps which can be used to for first test
Shows many basic functions of the S-EMUF board (Serial In/Out, Output to PIO, Interrupt handling for a PIO Pin, Interrupt handling for Z80-CTC counter.
Shows how to run own code on the TERM 1 System.
The code must be transmitted to the board via the serial interface using the Windows Forms App: Z80_Term_Utiliy (available in this Github Repo)