Interruption 28h - DOS Idle Loop / Scheduler
Undocumented
- issued by DOS during keyboard poll loop
- indicates DOS may be carefully re-entered by TSR
- used by TSR programs to popup and make DOS disk I/O calls
- supported by OS/2 compatibility box
- default behavior is to simply perform an IRET
- any DOS functions above 0Ch may be called while in this handler
see also INDOS