CP/M resources

CP/M and other ancient operating system have a small, but loyal, following, and it seems to be increasing. I've decided to group all the CP/M stuff on my site, to make it easier to navigate. I have various new utilities for CP/M, and a bunch of technical articles.

Original CP/M utilities

There are all new utilities, written and maintained by me, and tested on real Z80-based CP/M machines. All are released under GPL licence terms, with full source code.

Name	Description	Architecture	Manual	Binary	Source
scalc	A simple programmer's calculator	Z80	SCALC.TXT	scalc.zip	GitHub
cal	Display a monthly calendar	Z80	CAL.TXT	cal.zip	GitHub
du	Disk usage reporter	Z80	DU.TXT	du.zip	GitHub
kcalc	Scientific calculator	Z80/8080	KCALC.TXT	kcalc.zip	GitHub
life	Conway's game of life	Z80	LIFE.TXT	life.zip	GitHub
lz77	File compression	Z80/8080	LZ77.TXT	lz77.zip	GitHub
ls	File lister	Z80/8080	LS.TXT	ls.zip	GitHub
cwordle	Word guessing game	Z80/8080	CWORDLE.TXT	cwordle.zip	GitHub
ws2txt	WordStar file converter	Z80	WS2TXT.TXT	ws2txt.zip	GitHub
wdate	Read and set real-time clock on a machine with ROMWBW firmware	Z80	WDATE.TXT	wdate.zip	GitHub
suntimes	Display sunrise and suntset times, etc	Z80	SUNTIMES.TXT	suntimes.zip	GitHub
ktrider	Displays the 'Knight Rider' pattern on RC2014 front panel LEDs	Z80	KTRIDER.TXT	ktrider.zip	GitHub

Articles about CP/M

• Adventures with RC2014, Z80, and CP/M

• Serial device mapping in CP/M

• CP/M forty years on -- what it was, and why it still matters

• Using a CP/M machine to log into a Linux server using an RS232 connection

• The vexed problem of generating delays in a CP/M program

• Getting back into C programming for CP/M

• Getting back into C programming for CP/M -- part 2

• Playing Zork on a CP/M emulator on Linux

• Developing KCalc-CPM -- a scientific calculator utility for CP/M

• Using a Pi Zero and throw-away parts to provide a serial terminal for retrocomputing projects

• Writing new interactive fiction games for CP/M using PunyInform and Linux

• Multi-source Z80 assembly programming for CP/M

• A self-contained CP/M computer based on the Z80 Playground

CP/M emulator for Pi Pico

I've written a self-contained CP/M emulator for the Raspberry Pi Pico, with emulated hard disks in the Pico's flash memory. It's ready to be connected to a terminal emulator using a USB cable. Purely by coincidence, it runs CP/M programs under emulation at roughly the same speed as a real CP/M machine. Full details here.

Useful external links

• Aztec Museum -- Manx Aztec C compilers and documentation

• List of CP/M BDOS system calls, maintained by John Elliott

• A CP/M emulator for Linux

• Various assemblers and compilers, at the Retrocompting Archive

• CP/M internals, at Obsolescence Guaranteed