MEM F000h:2DC5h - IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911. ATIBM PC AT SIGNATURE Size: ??? signature Note: Original IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911. ATs with a multi-sector hard disk ROM-BIOS bug can be identified by checking a (currently unknown) signature at this location. This is known to be done by the 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. family. Presumably the OS will then prohibit timer ISR dispatches within a code window of F000h:2D95h..F000h:2DD4h.