Fujitsu MB91F109 FR30 Hardware Manual page 406

APPENDIX B Interrupt Vectors
Reference:
The area 1 kilobyte after the address indicated by the TBR is a vector address for EIT.
Each vector is 4 bytes in size. The relationship between the vector number and vector
address is as follows:
vctadr
382
= TBR + vctofs
= TBR + (3FC - 4 × vct)
H
vctadr: Vector address
vctofs: Vector offset
vct: Vector number