Please make a broom from the wire, connect it to the multimter with fast short ring responce and "clean" all the back side.
We have to know all the points with A8 address.
Could you check also the data bus. For instance Q1.
It would be good to ring All the Data and Address busses for short to +5V and Gnd. Just to be shure.
I do not see any short to GND and VCC.
here are images of All pin short of BIOS
1. These are common on both High and Low of BIOS. We have 2 BIOS so
2. They are high bios Data pins to F(Flash Memory SIM2) and to IC9 Tornado
3. They are high bios Data pins to Other ICs
4. They are low bios Data pins to F(Flash Memory SIM2) and to IC9 Tornado
5. They are low bios Data pins to Other ICs
I am still looking for more connections.
A8 is Number 27 and Q1 is number 14.
Note: Here Numbers represent the IC number, both BIOS as well as other ICS.