To unprotect "The Dambusters" from Accolade use the following debug proceedure. Note that even recent version versions of CopyIIPC cannot copy this software, and to protect your investment you will want to use this unprotect. ... 2) REN DAMB.EXE DAMB.BIN 3) DEBUG DAMB.BIN 4) Now search for the use of INT 13 -s 0000 FFFF CD 13 I found this call at 13BC:0116 You may find it at a different location, but as long as the number ends in 16 you have the correct location. ...