Can I get technical info on the PC-MOS386 operating system. I need to get the
data out of an old Cam Data Point of Sale Computer. My customer does want to
re-entry the data.  The hardware is standard PC.        
PC-MOS must have had a proprietary drive format because the drives are
unreadable in Windows/DOS even using DOS debug absolute sector read.
Since PC-MOS was a multi-tasking DOS clone it likely support DOS
format and fat16 as well. The Software Link Inc was the name of the
company that made it. A working copy of the software would too since
Cam Data appears to have used a runtime version.

http://www.o3one.org/hwdocs/bios_doc/dosref22.html
http://www.oopweb.com/Assembly/Documents/InterList/Volume/INTERRUP.R
http://manual.codesky.com/interrupt/INT-D4.HTM
http://www.frontiernet.net/~fys/yourhelp.htm
http://poli.cs.vsb.cz/misc/diskutil/
http://poli.cs.vsb.cz/misc/rbint/