struc NDReadRequest             ; Device-Driver function 05h
 nrrLength      db ?            ; Length of structure, in bytes
 nrrUnit        db ?            ; Not used
 nrrFunction    db ?            ; Function number (05h)
 nrrStatus      dw ?            ; Status
 nrrReserved    db 8 dup (?)    ; Reserved
 nrrChar        db ?            ; OUTPUT: character read from device
ends                            ; = 14d bytes