Really the fastest Z80 aka CP/M computer emulator

Simeon Cran publishes 1998 the last version of MyZ80, the fastest Z80 and CP/M computer emulator for DOS, totally written in assembler. But it's still running with Windows XP (Vista users: It's a 16 Bit application, so bad luck for you).

You can find a shareware version of MyZ80 in the Simtel archives here.
It's a shareware version, but the author of MyZ80 can't be contacted anymore (the last known mail address s373718@student.uq.edu.au isn't working anymore).

The latest "full" version was MyZ80 Version 1.24 and adds some additional API functions and a few other speed and functional enhancements (funny, a "Robotron" terminal emulation too), for a full list see here.

It's 100% compatible with CP/M 2.2 and CP/M 3.0, but QP/M from Microcode Consulting seems to be a bit incompatible - surprisingly because they offer a MyZ80 package.

Look at these screenshots, made with the last MyZ80 version and CP/M 2.2, 3.0 and QP/M:

It's does only occur if USER 1 (or more) is used. Turbo Pascal 3 seems to write something back or tries to set the drive when terminated with 'Q' - an API function which seems to be incompatible (with other USER areas than 0) in QP/M.

Hint:
If you're using Windows 7 (or Vista) x64, you can't execute 16bit programs. So you have to use a virtual machine or an emulator.

VMware Player 3.x is an excellent choice (and free), but you have to install an OS first.
DOSBox 0.7x is also able to execute it, and it offers a build-in DOS 5.0. Although it's a bit slower than VMware Player, you can speed it up easily:

To get maximum speed, set a few options in DOSBox config file.
For Windows 7, this is located this is located in %LOCALAPPDATA%: core=dynamic
cycles=max

Other emulators:

Z80MU v5.2 from Joan Riff (uses the guest OS file system)

CPEM (Knight Software, can emulate Z80 also, can support V20/V30, uses the guest OS file system)

Newer ones:

YAZE AG Yet another Z80 emulator - the latest version is maintained from Andreas Gerlich, CP/M 3 pack for YAZE >here<

Z80EM86 is a CPU emulator entirely coded in x86 assembly language, a CP/M 3 system can be found at Gaby's Website also, as well as the sources. Thx to Stewart Kay for the program and the updated info.

Z80PACK from Udo Munk (this site also offers a lot of other interesting things like a PL/M compiler and a reconstructed CP/M 1.4). A mirror of this site can be found at z80cpu.eu >here<.

Altair 8800 simulator (with SIMH) from Peter Schorn running CP/M 1.4-3.0, QP/M, Personal CP/M, DOS Plus a.s.o. like IMDOS (!).

Unfortunately, the last one in this list, the Altair 8800 simulator, had a problem with the handshake/negotiation when telnet is used - and you have to use telnet, because there is no terminal emulation included.
sim> set telnet console=23 wasn't working well (chars are lost when ESC-sequences are bind to cursor keys while editing files with Turbo PASCAL).
But it's also possible to send all console output to telnet with:
sim> attach sio 23

(Meanwhile Peter Schorn has altered the program to correct this, so it can be working now also with "set telnet console=23".)

With Hyperterminal from Windows it's not possible to get a usable connection (over TCP/IP and Winsock), with the console application telnet.exe there is no problem (but also no terminal emulation). A telnet connection with Kermit-95 will work seamless with a proper configuration:



Just uncheck "Telnet negotiations must complete" and it will work.

Peter Schorn's Altair SIMH works very well and emulates a lot of hardware (e.g. beside the Altair 8800 also an IMSAI 8800). It's interesting looking at the old MITS Disk Extended BASIC 4, Altair DOS 1.0 and IMDOS 2.05 as well. Do not be confused about the cryptic console commands, Peter Schorn provided every package with a script file, so just start the simulator and type in 'do scriptname' (e.g. 'do imdos' to boot IMDOS).