Z80
Is Collapse OS really a practical proposition?Is it really possible to design an operating system for a computer built from scavenged parts after civilization has failed?
Categories: retrocomputing, Z80
Running CP/M on the Raspberry Pi Pico microcontrollerThis article introduces CPICOM -- an emulator for CP/M 2.2 on the Raspberry Pi microcontroller.
Categories: retrocomputing, Pico, C, Z80
Getting back into C programming for CP/MThis article is about how programming for CP/M, usng a 40-year-old C compiler, differs from modern C development, even for console applications.
Categories: retrocomputing, C, Z80
Getting back into C programming for CP/M -- part 2Using the 1989 HI-TECH C compiler on CP/M, and some general observations about CP/M programming with real hardware.
Categories: retrocomputing, C, Z80
The vexed problem of generating delays in a CP/M programCP/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?
Categories: retrocomputing, Z80
CP/M resourcesA landing page for my various CP/M articles and utilities.
Categories: Z80, retrocomputing
CP/M forty years on -- what it was, and why it still mattersWhy was the CP/M operating system so successful? Forty years on, why should we care?
Categories: retrocomputing, Z80
Serial device mapping in CP/MCP/M only recognized four serial devices. How did application cope when more than four serial ports were installed?
Categories: retrocomputing, Z80
Playing Zork 1 on a CP/M emulator on LinuxIn 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.
Categories: general computing, retrocomputing, Z80
cwordle -- A Wordle-like word-guessing game for CP/MBuilding a CP/M implementation of the notorious Wordle game.
Categories: retrocomputing, C, Z80
Developing KCalc-CPM -- a scientific calculator utility for CP/MMy first CP/M program for nearly 40 years -- how, and why, I wrote it.
Categories: retrocomputing, C, Z80
Using a CP/M machine to log into a Linux server using an RS232 connectionBecause -- why not?
Categories: retrocomputing, Z80
Writing new interactive fiction games for CP/M using PunyInform and LinuxIt'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.
Categories: retrocomputing, Z80
Adding a floppy disk controller to my RC2014 Z80 systemNo 80s computer is complete without the chucka-chucka-chucka sound of a floppy disk drive doing its thing.
Categories: electronics, Z80, retrocomputing
Designing a dual 5V-to-RS232 serial level converter for the RC2014Using 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.
Categories: electronics, Z80, retrocomputing
Some thoughts on a DS1302 real-time clock board for RC2014/Z80 and CP/MConstructing and programming a real-time clock board for my Z80 CP/M system
Categories: C, electronics, Z80, retrocomputing
Constructing and programming a YM2149 sound board my RC2014 Z80 systemAn 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.
Categories: electronics, Z80, retrocomputing
Adventures with RC2014, Z80, and CP/MThis is a landing page for my various articles on building a period-appropriate CP/M system using the RC2014 bus.
Categories: Z80, retrocomputing
Exchanging files between an SC130 CP/M board and a Linux systemThis article describes a couple of methods for sharing data and code between a CP/M system with RomWBW BIOS and a Linux system.
Categories: C, electronics, Z80, retrocomputing
Updating, building, and flashing RomWBW on an SC130 CP/M systemA step-by-step guide to building and installing a modified version of the RomWBW firmware on a CP/M Z80 board.
Categories: Z80, retrocomputing
Multi-source Z80 assembly programming for CP/MHow to use Microsoft's Macro80 and Link80 utilities on CP/M, to build a program consisting of multiple assembly-language files.
Categories: retrocomputing, Z80, assembly
A self-contained CP/M computer based on the Z80 PlaygroundThis 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.
Categories: Z80, retrocomputing