Did you try booting MS-DOS inside DOSBox, as I suggested earlier? yes, but did finally not succeed, HDD img establishing worked so far after a couple of Trials but 1. I did not find anywhere on the net the img files of the 3 MS-DOS Floppies to install MS-DOS 2. I succeded to find the iso Image of a …

Are you sure that you don't need FILES=250 instead ? As that comes up quite often here. you are correct, files are only 50, but FCBS are 250. I use in the config.sys/config.nt the following (for WIN XP as well for WIN 7 32bit): fcbs=250,8 stacks=18,256 files=50 unfortunately this does not work …

So the question ist, how many FCBS Dosbox is supporting by default? The thing is, that DOS originally as default is supporting 4 FCBS only, but I need FCBS=250, as well as stacks=18,256, originally writtne in the config.sys.

Search about FCBS did not show any application hit, are these command not available in Dosbox?