Is it really possible to design an operating system for a computer built from scavenged parts after civilization has failed?
This article introduces CPICOM -- an emulator for CP/M 2.2 on the Raspberry Pi microcontroller.
This article is about how programming for CP/M, usng a 40-year-old C compiler, differs from modern C development, even for console applications.
Using the 1989 HI-TECH C compiler on CP/M, and some general observations about CP/M programming with real hardware.
CP/M has no timing or delay functions, because CP/M never stipulated that compatible hardware have any kind of clock. So how do we implement short (fractions of a second) delays in a CP/M program?
A landing page for my various CP/M articles and utilities.
Why was the CP/M operating system so successful? Forty years on, why should we care?
CP/M only recognized four serial devices. How did application cope when more than four serial ports were installed?
In the last few years there has been a revival of interest in 8-bit microcomputers from the 70s and 80s. Many of these were based on the Zilog Z80, and many ran CP/M. This article about getting started with CP/M using an emulator on Linux.
Building a CP/M implementation of the notorious Wordle game.
My first CP/M program for nearly 40 years -- how, and why, I wrote it.
Because -- why not?
It's still possible to write text adventure games for CP/M and other small, vintage computers. Here is one approach, using Linux as the development platform.
No 80s computer is complete without the chucka-chucka-chucka sound of a floppy disk drive doing its thing.
Using an RC2014-based retrocomputer with genuine RS232 peripherals requires support for voltage level conversion. Although converter modules are inexpensive and widely available, I wanted to design something that would plug into an RC2014 backplane, just for neatness.
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 is a landing page for my various articles on building a period-appropriate CP/M system using the RC2014 bus.
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.
How to use Microsoft's Macro80 and Link80 utilities on CP/M, to build a program consisting of multiple assembly-language files.
This article describes how to create a self-contained CP/M-based microcomputer using a Z80 single-board computer, a Raspberry Pi Zero, and some assorted electrical parts.