CP/M only recognized four serial devices. How did application cope when more than four serial ports were installed?
Because -- why not?
The Pi Pico is an impressive microcontroller for its size and cost, but it lacks specific non-volatile memory. This article explains how to use the program flash ROM for that purpose.
Constructing and programming a real-time clock board for my Z80 CP/M system
An 80's-style 8-bit computer has to be cable of making 80's 8-bit sound. In this article I describe adding a sound board to my RC2014 system.
This article describes a couple of methods for sharing data and code between a CP/M system with RomWBW BIOS and a Linux system.
A step-by-step guide to building and installing a modified version of the RomWBW firmware on a CP/M Z80 board.