There is an error. Now baro never updates from memory. The value had cleared when you removed power from pcm.

Tell me what fixed value you want for baro. Do you want it to update at ign on engine off. There is also 6 tables that are baro related modifiers. If you set the baro at 55 kp these tables will always read the lowest position.

Patching anything will not be that hard. Just need to know how do you like the PCM to behave. Do you know some other PCM from that era that use 2 bar map sensor and turbo setup. I can copy the conversion from raw map to baro, so you don`t have to lose these built in baro corrections.

There is another conversion from raw baro 3f to some scaled map baro value stored at byte_0158. byte_0158 is used for baro table lookups.