233c233,237
< 	if (outregs.h.al == 0 || outregs.x.cflag != 0) {

---
> 	/*

> 	** One ought to be able to check for outregs.h.al == 0

> 	** but some BIOSs aparently blow this.

> 	*/

> 	if (outregs.x.cflag != 0) {

236d239
< 		if (outregs.h.al == 0) es = "DOS disk";