INT 5A - TI Professional PCIBM PC - SYSTEM TIMER 100ms HOOK Desc: called from the hardware timer tick interrupt, after executing the first four 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. timing events, updating the system clock, saving registers, and switching to a temporary stack (the one reserved for IRQ3), but before calling INT 58 no details available Notes: this interrupt is invoked on every fourth timer interrupt the handler for this interrupt may destroy AX,BX,DI,ES but must preserve all other registers; 8 WORDs of stack space are available, of which at most 4 may be used if the handler enables interrupts if the handler switches stacks (because more than 4/8 WORDs are required), the original stack must be restored before chaining to the previous handler SeeAlso: INT 43"TI Professional",INT 4C"TI Professional" SeeAlso: INT 58"TI Professional"