Int 58  C - Ti Professional Pc - System Timer 25ms Hook                    [b]

Desc:  called from the hardware timer tick interrupt, after executing the
     first four BIOS timing events, updating the system clock, invoking
     INT 5A if required, saving registers, and switching to a temporary
     stack (the one reserved for IRQ3)

Notes: 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

See Also: INT 43"TI Professional",INT 4C"TI Professional"

See Also: INT 5A"TI Professional"