There is an emulator for MS-DOS. At least two that I
know of. One came
 from Intel and I don't remember where the other one came from.
 I can email that easily. I will have to look a bit for the MCS-48 stuff,
 but I know I have it. Will have to cable up my Intel Development System
 to a PC and use Kermit to transfer them. 
Thanks for all your help!
I've read the emulator document. Sounds very reasonable. In my project,
I found batch files of the following form:
  @ECHO OFF
 ECHO    Batch assembly of assembly files (*.SRC)
 ECHO.
 ECHO.
 KDI BATCH C:\IBIS\PROJECTNAME\SUBPROJECT\CSD\KLASM(%1)
 ECHO.
 BEEP
 ECHO.
 ECHO.
 PAUSE 
This seems to correspond with the KLASM.CSD file that looks much like:
  ; DO ASM(SRC filename)    Name: KLASM.CSD    Date:
XX.XX.XX
 ; Assembly call
 ;
 BATCH :F8:projxxx
 CONTLINE ON
 ASM48 :F2:%0.SRC &
   OBJECT(:F3:%0.HEX) PRINT(:F4:%0.LST) &
   MACROFILE NOCOND NOSYMBOLS PAGELENGTH(66)
 CONTLINE OFF
 C:\ISIS\ASM80\HEXOBJ :F3:%0.HEX TO :F3:%0.OBJ
 ; 
But... If I'd use the emulator the way it's meant and even with that CSD
thing - why is there a DOS path in the file?!?
And what or who is KDI?
I'm still quite helpless... Seen anything of that before?
Regards,
Philipp