Hi,

I've just found a small bug in the emulation of int 13h (or that's what I think 😀 ).

In function 8 of int 13h (Get drive parameters) DOSBox seems to report one more cylinder than the correct value. For instance, for a 1.44'' floppy drive it returns CX = 5012h, when it should be 4F12h.

I've had a look at the source code; the solution seems to be pretty simple. In src/ints/bios_disk.cpp I added the following line after line 445:

tmpcyl--;

I found the bug while trying to install DOS 4.01 in a hard disk image. Before the correction the setup program gave a "Bad media" error and exited; after the correction it works.