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
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
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
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
Various assemblers and compilers, at the Retrocompting Archive
CP/M internals, at Obsolescence Guaranteed
