Exchange

Minimal CP/M for UNIX

Overview

Greetings!

This is a utility that allows CP/M disk images to be manipulated under UNIX. It supports disk images in either the standard DRI 8" SSSD format or the P112 3.5" format. Disk images can be examined and files imported and exported from them.

Sources

The source is a slightly hacked over copy of CP/M-68K which has been worked over to allow compilation on UNIX using GCC, to wit:

• A handful of typecasts have been dropped in.
• An assumption that an int is 16 bits has been fixed.
• An assumption that chars are signed has been fixed.
• The file diverge.h renames all of the globals to ensure they don't collide with operating system globals.
• I changed the way the BDOS communicates with the BIOS; see biosdef.h
• There are probably a couple of other minor changes I made that I've forgotten (perhaps renaming a routine or two before I decided to make diverge.h).
• A BIOS that allows the program to be run under UNIX.

I've also added a couple of built-in commands:

• EXIT causes CP/M-68K to exit, returning to the host operating system.
• IMPORT copies a file from the current directory of the host operating system into the disk image.
• EXPORT copies a file from the disk image into the current directory of the host operating system.

IMPORT and EXPORT do not accept wildcards.

This is just a quick hack that turned out to be useful, not a snazzy disk image manipulation program.

Building

To build the program, execute make.

This results in an executable called exchange.

The command-line syntax is: exchange [-p112] file.img, where:

• -p112 This option tells the file to use the P112 3.5" disk format for the image. By default, the the standard DRI 8" SSSD format is used.

• file.img is the name of the disk image that should be used.

Usage

In this example, I copy the file BDOS.LST from a DRI 8" SSSD image containing CP/M-80 1.4 sources (obtained from The Unofficial CP/M Web Site) to USER 1 of the P112 boot disk image (obtained from The P112 Homepage):

% uname -a
Linux powerpc.no.domain 2.4.22-2f #1 Sun Nov 9 16:49:49 EST 2003 ppc
% ls
bdosPLM.img  bootdisk.img  exchange
%./exchange bdosPLM.img

A>dir
A: BDOSI    SRC : BDOS     PLM : BDOS     OBJ : BDOS     LST
A>export BDOS.LST
export BDOS    .LST -> BDOS.LST
A>exit
% ls
BDOS.LST  bdosPLM.img  bootdisk.img  exchange
%./exchange -p112 bootdisk.img

A>user 1

1A>dir
A: RECEIVE  PAS : UUENCODE PAS : UUDECODE PAS : USER     MAC : ROM    UUE
A: ROM      PAS : ROM      COM
1A>import bdos.lst
import BDOS.LST -> BDOS    .LST
1A>dir
A: RECEIVE  PAS : UUENCODE PAS : UUDECODE PAS : USER     MAC : ROM    UUE
A: ROM      PAS : ROM      COM : BDOS     LST
1A>exit
%

Conclusion

Enjoy!

• Roger Ivie <[email protected]>