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

The source is a slightly hacked over copy of CP/M-68K which has been worked over to allow compilation 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 quickie hack that turned out to be useful, not a snazzy disk image manipulation program.

• exchange-0.2 sources. This version has been updated to use the new P112 disk format.
• exchange-0.1 sources. A .ZIP file (which is much smaller) can be found over at the Unofficial CP/M Web site.