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I see that blogger has gotten to big for its servers. Too bad I enjoy reading them and sometimes writing them too. Maybe later.

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Emulators For CP/M

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 There are several good software emulators that allow you to run CP/M on modern systems.   These are the ones I worked with for this presentation.  They all can be run under Linux, Windows, and MacOS. With the exception of CPMemu which only supports Linux. Z80Pack  z80pack is a Zilog Z80 and Intel 8080 cross development package for UNIX and Windows systems distributed with all sources under a BSD style license.  The CPU emulations are generic and can be used to emulate any Z80 or 8080 based system, the I/O hardware abstraction is well isolated. Originally the software was written for emulation of proprietary Z80 controllers, to support development and testing.  This virtual computer system has then been used to r21546ebuild CP/M 1, CP/M 2, CP/M 3 and MP/M 2 completely from the sources. Also example implementations of CP/NET have been build, to network the virtual systems with this very early implementation of RPC (remote procedure calls). Additional d...
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What is CP/M

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CP/M is a monitor control program for microcomputer system development that uses floppy disks or Winchester hard disks for backup storage. Using a computer system based on an 8080 or Z-80 compatible microcomputer, CP/M provides an environment for program construction, storage, and editing, along with assembly and program checkout facilities. CP/M can be easily altered to execute with any computer configuration that uses a compatible Central Processing Unit (CPU) and has at least 20K bytes of main memory with up to 16 disk drives. Although the standard Digital Research version operates on a single-density Intel MDS 800, several different hardware manufacturers support their own input-output (I/O) drivers for CP/M. The CP/M monitor provides rapid access to programs through a comprehensive file management package. The file subsystem supports a named file structure, allowing dynamic allocation of file space as well as sequential and random file access. Using this file system, a large numbe...
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The CP/M Talk Went Well

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 I gave the talk at BoatFest 2025 .  The crew there did a Twitch Live Stream of it.  Here is the VOD stream.   In the process of preparing for the talk,  I put together a GitHub repository that has all my notes, resources, references, slides, and the actual paper that went into the talk. I also had a table at the show.  I had six display stations set up: A PiDP-11 with a monitor so the visitors can interact with the system A  PiDP-8 with a monitor so the visitors can interact with the system An Altair-Duino which is an Altar-8800 emulator with a keyboard and monitor. The SC-131  attached to a laptop putty session to demo all the hello world test programs A Linux laptop running all the CP/M Emulators in separate windows so the visitors could compare the operation of each emulator. An old IBM ThinkPad R31 running Windows XP, just because I thought it was cool.  This laptop is the reason I am in West Virginia in the first place. I also had a...
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