Note, that, although some ids have been assigned otherwise in the past, DrvrSW and DrvrHW ids in the range 0 - 127 are meant for use by Apple; other vendors typically are assigned ranges from 128 on up (that explains the gap from Apple boards to the $01xx numbers in the example on the last card.
The Board sResource
The board sResource always has fixed values for it's sRsrc_Type fields. They are:
CatBoard EQU $0001 ;Always $0001 for board sResource
TypBoard EQU $0000 ;Always $0000 for board sResource
DrSWBoard EQU $0000 ;Always $0000 for board sResource
DrHWBoard EQU $0000 ;Always $0000 for board sResource
The board id goes in the board sResource, and is assigned by MacDTS. The vendor information that goes into the board sResource is defined by the vendor; MacDTS doesn't assign it.