An 8031/8051 assembler by Ken Stauffer and Theo Deraadt which produces a variety of object code output formats.
It's the modified as31, i've mentioned in my EZ-USB pages.
I wrote to Paul Stoffregen already, with the please to update his as31 build - without success .
Thats why this page exists .
darcs get http://darcs.erazor-zone.de/as31/