MEM 0040h:0070h - TIMER OVERFLOW Size: BYTE Desc: non-zero if timer has counted past midnight since last call to INT 1A/AH=00h Note: the original IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911. BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware. The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly., and thus most other BIOSes, sets this byte to 01h at midnight; a few (such as the Eagle PC-2) increment it each time midnight is passed. The former behavior results in lost days if multiple midnights pass between "get-time" calls while the machine is powered up. SeeAlso: MEM 0040h:006Ch,INT 1A/AH=00h