This is a current list of bugs/misfeatures (not counting programs which wouldn't run because of unimplemented functions/features) 1. keyb reverses keystrokes when they are typed quickly. Not sure if this is my emulator at fault or keyb - investigating it... 2. mfs.c has bugs in it. I've fixed a couple of the more obvious ones, but it occasinally crashes a bit when running xtree. (the logged drive had to be disconnected and reconnnected again to cure the problem) 3. MSDOS 5 dosshell program refuses to switch tasks - claiming there is insufficient disk space. MSDOS 6 dosshell has no problem with this. Both MSDOS 5 and MSDOS 6 cause an invalid opcode to be executed when run on a monochrome screen. 4. MSDOS very occasionally hangs with 'stack overflow' if network load is heavy and lots of keys are pressed at once. Increasing the 'stacks=' line in the config.sys file can help this problem. This list is almost certainly not complete.