Here is the easy part:
http://membres.lycos.fr/jeffcalc/serialcable.pdf
The hard part is getting DOS EMU71 on the PC to directly connect to a serial port. There are a number of commercial packages that provide a service or driver for Windows that will permit DOS programs to directly access serial ports (including USB->Serial devices). I have yet to find a free one.
Do you know the names of any of the commercial packages with the drivers?
Thanks, Mike
http://www.adontec.com/commex_e.htm
I've have had limited success with Dosbox and/or Bochs. Both allow DOS to run in an emulated environment. Both simulate serial ports. But I have not had the time to work out all the kinks.
If you figure this out, please share.
Edited: 24 Feb 2008, 6:23 p.m.
If that's of any help, the Clonix 'burning' software comes with a serial port driver for NT/W2K/XP...
See www.clonix41.org for more details.
Raymond