Int 61 Fn 1B  - Atari Portfolio - Set Peripheral Id Byte                   [b]

   AH = 1Bh
   AL = which peripheral to set
       00h serial
       01h parallel
   DL = peripheral ID

Return: nothing
Desc:  specify that a peripheral is compatible with the BIOS serial or
     parallel services

See Also: AH=1Ah"Portfolio",AH=1Ch"Portfolio"