This is a CP/M 2.2 execution environment. It provides everything needed to run a standard CP/M for Z80 or 8080 binary.
Uses my iz80 library for Zilog Z80 and Intel 8080 emulation.
Made with Rust
Note that iz-cpm is a very basic implementation, mostly for educational purposes. I recommend MockbaTheBorg's RunCPM or Udo Munk's Z80pack for a much more complete CP/M emulation.
Extract the latest zip for Linux, MacOS or Windows. Optionally run download.sh or download.bat to download the CP/M 2.2 system disk, Microsoft Basic, Turbo Pascal, Lisp and some games.
To build from source, install the latest Rust compiler, clone the repo and run cargo build --release. To cross compile to Windows, install the target with rustup and run cargo build --release --target x86_64-pc-windows-gnu.
Execute iz-cpm to open the CP/M command prompt (the CCP) on the current directory:
casa@servidor:~/software/cpm22$ ls
ASM.COM CCSINIT.COM DISKDEF.LIB iz-cpm STAT.COM
CBIOS.ASM CCSYSGEN.COM DUMP.ASM LOAD.COM STDBIOS.ASM
CCBIOS.ASM CPM24CCS.COM DUMP.COM MOVCPM.COM SUBMIT.COM
CCBOOT.ASM DDT.COM ED.COM PIP.COM SYSGEN.COM
-CCSCPM.251 DEBLOCK.ASM GENMOD.COM RLOCBIOS.COM
casa@servidor:~/software/cpm22$ ../../iz-cpm
iz-cpm https://github.com/ivanizag/iz-cpm
CP/M 2.2 Copyright (c) 1979 by Digital Research
Press ctrl-c ctrl-c to return to host
A>dir
A: CCSINIT COM : MOVCPM COM : CPM24CCS COM : STAT COM
A: SYSGEN COM : STDBIOS ASM : IZ-CPM : LOAD COM
A: DISKDEF LIB : ASM COM : RLOCBIOS COM : DUMP COM
A: -CCSCPM 251 : CCBIOS ASM : DUMP ASM : CCSYSGEN COM
A: DEBLOCK ASM : ED COM : SUBMIT COM : DDT COM
A: PIP COM : CBIOS ASM : CCBOOT ASM : GENMOD COM
A>Execute iz-cpm with a file to execute a CP/M binary directly, bypassing the CPP:
casa@servidor:~$ ./iz-cpm software/OBASIC.COM
44531 Bytes free
BASIC Rev. 4.51
[CP/M Version]
Copyright 1977 (C) by Microsoft
Ok
print "hello"
hello
Ok
Map up to 16 directories as CP/M drives:
casa@servidor:~$ ./iz-cpm --disk-a software/cpm22 --disk-b software/zork --disk-e .
iz-cpm https://github.com/ivanizag/iz-cpm
CP/M 2.2 Copyright (c) 1979 by Digital Research
Press ctrl-c ctrl-c to return to host
A>b:
B>dir
B: ZORK2 DAT : ZORK1 COM : ZORK3 DAT : ZORK3 COM
B: FILE_ID DIZ : ZORK1 DAT : ZORK1 SAV : ZORK2 COM
B>zork1
ZORK I: The Great Underground Empire
Copyright (c) 1981, 1982, 1983 Infocom, Inc. All rights
reserved.
ZORK is a registered trademark of Infocom, Inc.
Revision 88 / Serial number 840726
West of House
You are standing in an open field west of a white house, with
a boarded front door.
There is a small mailbox here.
>iz-cpm https://github.com/ivanizag/iz-cpm
CP/M 2.2 Copyright (c) 1979 by Digital Research
Press ctrl-c ctrl-c to return to host
USAGE:
iz-cpm [FLAGS] [OPTIONS] [ARGS]
FLAGS:
-t, --call-trace Traces BDOS calls excluding screen I/O
-T, --call-trace-all Traces BDOS and BIOS calls
-z, --cpu-trace Traces Z80 instructions execution
-h, --help Prints help information
-s, --slow Runs slower
-V, --version Prints version information
OPTIONS:
--cpu <model> cpu model z80 or 8080 [default: z80]
-a, --disk-a <path> directory to map disk A: [default: .]
-b, --disk-b <path> directory to map disk B:
-c, --disk-c <path> directory to map disk C:
-d, --disk-d <path> directory to map disk D:
--disk-e <path> directory to map disk E:
--disk-f <path> directory to map disk F:
--disk-g <path> directory to map disk G:
--disk-h <path> directory to map disk H:
--disk-i <path> directory to map disk I:
--disk-j <path> directory to map disk J:
--disk-k <path> directory to map disk K:
--disk-l <path> directory to map disk L:
--disk-m <path> directory to map disk M:
--disk-n <path> directory to map disk N:
--disk-o <path> directory to map disk O:
--disk-p <path> directory to map disk P:
--terminal <terminal> Terminal emulation ADM-3A or ANSI [default: adm3a]
ARGS:
<CMD> The binay image to run,
<ARGS> Parameters for the given command
- Execution of 8080 and Z80 binaries on top of CP/M
- Direct usage of the host computer filesystem
- Terminal emulation of ADM-3A as used in the KAYPRO computers
- Z80 emulation validated with ZEXALL
- CPU execution tracing
- BDOS and BIOS tracing
- Portable, runs in Linux, MacOS and Windows. Mmm, not in CP/M.
CP/M was designed to be portable to a variety of devices using Intel 8080, Intel 8085 or Zilog Z80 processors thanks to a tiered architecture. The main parts of CP/M are:
- The BIOS: Basic Input/Output system. Interface with the hardware. CP/M defines a very small interface: 16 entrypoints to manage I/O and access to disk sectors. The hardware vendors provided the BIOS for their device based on source code available on the CP/M distribution.
- The BDOS: Basic Disk Operating System. Main component of CP/M. Provided by Digital Research and common to all systems. Provides the high level entrypoints to be used by application developpers.
- The CCP: Console Command Processor. The CP/M Command prompt.
To emulate this environment using the host filesystem, we have to provide a replacement BDOS translating as we don't want to relay on the physical disk sectors abstraction of the BIOS. The main components are:
- Z80 emulator. It uses iz80
- BIOS emulator. Only the I/O entrypoints. In theory, it shouldn't be necessary, but some programs use it directly, bypassing BDOS.
- BDOS emulator. Traps the calls and executes code on the host.
- CPP. Runs natively, no emulation needed. We use ZCPR1 an open source alternative. See cpmish for other open source alternatives to the CP/M binaries. The CPP binary from CP/M 2.2 can be used optionally.
- Terminal emulator. CP/M does not define how the terminal should work. Applications needed to be aware and usually could be configured for several leading options, like ADM-3a, VT-52, Hazeltine 1500 and Osborne. This emulator supports ADM-3a used also on the very popular Kaypro computers.
- Proper documentation
- File level read-only option (I won't do that, the host can control that)
- BIOS support for punch cards (Nope)
- BIOS support for track/sector access to disks (Not needed)