First of all, why I could not put Party on Wutai Bridge in save file. It seems that the Z coordinate format is different in PSX and PC version. I didn't notice it, therefore I couldn't.
Followings are about PSX version and I used only FF7 International.
Edited/12-8, 9, 10 & 16Followings are results of editing Height value in save file.
Which value make a Party located on Bridge or Ground: Wutai Bridge
Theoe values are changed depending on the Party's standing position (Height of Bridge and Ground)
Corel Bridge is different.
Under the bridge, Party hanged in the air depending on height value.
In Forest, this phenomenon occurs in all height. And Party can walks 1 or 2 step in the air or under the ground.
MCR file of Party stands on BridgeParty's X-Y Coordinate was taken from Emulator's Quick Save file.
Quick Save was taken when Party running toward Bridge Rope while Bridge was swinging.
When this save is loaded, Party is caught in the rope. Party's movement is restricted. Can open menu, location name is Midgar Area.
It is necessary to save swinging bridge coordinates to slot for avoiding this problem,
I think this must be the reason that cannot open menu on bridge.
And this file was accidentally made. Bridge is vibrating hardly when Party is moving.
MCR file Bridge vibratingBuggy and Chocobo. Ride on flag in save file.
If it can ride off from Buggy and Chocobo on Bridge, ride off and walk to the place where can open menu and save the game.
It is not able to check directly, but can make same situation by editing Save file.
After loading that save, Buggy and Chocobo falls down under the Bridge. It means Buggy and Chocobo are not able to stand alone on Bridge.
Ride on Flag
0x0FA1 Ride on (Normal World Map & Underwater map)
Tiny Bronco=0x05, Chocobo=0x13, Buggy=0x06, Highwind=0x03, Submarine=0x0D
(Tiny Bronco and Submarine cannot stays on Bridge even if party is riding. Highwind always flies in the air when Party is riding, and Bridge ignored.)
While investigating the above-mentioned thing, I found Party is able to ride various objects.
Flag for switching World Map.
MCR Save file Underwater map (FF7 International Disc2)0x0FA2 Map Switch
0x00: World Map
0x02: Underwater Map
0x03: Unknown Map
Unknown Map includes "Midgar Area", "Bottom of the Sea" Area and "Icicle Area". The turning snow field next to Gaeas Cliff Base is a part of this "Icicle Area"
(I cannot find a cave yet) Currently, warp area to the field Great Glacier and 6 caves found.
MCR Save file Bottom of the Sea (FF7 International Disc3)(After a encounter, PHS and Save in Menu will be disabled. Cheat code used for saving file. )
I had used Eslava's Save file and Black Chocobo sample file. Thank you for them.