INT E4 - DIGITAL RESEARCH - FLAG INTERRUPT Note: This interrupt corresponds with Concurrent CP/M-86One of the three operating systems offered by IBMInternational Busiuness Machines for its original PCIBM PC (the other two were MSDOS and the UCSD p-System). It has since evolved into DR-DOS version 6 and Novell DOS 7. and is to get an unused flag. SeeAlso: INT E5"DIGITAL RESEARCH"