Well, if it is offered on a silver spoon, like in the mentioned book (or when reading the code), Apple DOS is quite simple to understand ... I just think _I_ would have had a lot of trouble creating it. Gruss H. (Hint, skip your strikt byte sendes thinking and try to see the low level DOS funktions more like hardware) -- Stimm gegen SPAM: http://www.politik-digital.de/spam/de/ Vote against SPAM: http://www.politik-digital.de/spam/en/ Votez contre le SPAM: http://www.politik-digital.de/spam/fr/ Ich denke, also bin ich, also gut HRK