ImageWriter "direct text" from OS X?

I posted this question over at linuxprinting.org (
http://tinyurl.com/p9l7d ) as well, but figured this would be a great
place to xpost.

Just as some extra info, I'm using print66 on an old Starmax running
8.6 as my print server, with an original ImageWriter. I'm hoping to
get that very fast, but very obviously dot matrix style font out of my
ImageWriter when printing from OS X. I've got the Starmax serving to
Windows in this fashion, which is great, but would like to have my OS X
boxen doing the same thing.

from here:
http://www.linuxprinting.org/show_pr...le-ImageWriter

*[Using GIMP Print, the ImageWriter] Printer supports direct text
printing with the `us-ascii' charset.*

I'm afraid I'm not sure how to sent a print job from OS X for use with
"direct text" on the ImageWriter. I'm able to send direct text jobs
from Windows using the generic "Generic/Text Only" driver, which prints
very quickly. In OS X-land, I'm stuck with the style of print that
prints the font the doc's in, etc, which is very slow. Great for web
pages, etc, but not for plain text.

(I'm able to get the same "high-res" output from Windows using the
C-Itoh print driver, fwiw. What I want to do is get plain text on OS
X.)

How do I tell the ImageWriter via GIMP print that I want something
printed as us-ascii? I didn't see it as an option in setup nor in the
printer section of the print window.

Any help greatly appreciated.

Ruffin Bailey