serio.s:
 - add 16550 support (info included in serio.s, just not implemented)
 - allow program to exit without clearing DTR/RTS
 - allow user supplied tx/rx buffers (user will have to lock them down of
   course)
 - event callbacks (lsr, msr, rx/tx)
 - better documentation
 - more demonstation programs
 - check if comX is availiable (term.c)
 - get io-adress from bios-block (term.c)
 - optional -comIO,IRQ:... for any user-defined setting (term.c) ... done
 - support library