MEM 0040h:0076h - FIXED DISK - CONTROL BYTE {IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911. documented only for XTIBM PC XT} Size: BYTE Desc: loaded from the disk parameter table control byte (offset 8) during various hard disk operations SeeAlso: MEM 0040h:0075h"FIXED DISK",MEM 0040h:0077h"FIXED DISK"