OBD1 16V doesn't have a MAP or Baro sensor. OBD2 has a baro sensor and I think a MAP sensor in the US market, as I recall neither are used for fuelling corrections, they are mainly for the EGR.
An OBD1 ECU outputs more live data parameters than a 96/97 does via OBD2 although the OBD1 interface on the 96/97 has much more capability.
On a MAP based system (8V) the baro taken from the MAP at key on and then updated based on maximum or minimum readings, I forget which!