Tools:
Pasmo (Z80 cross assembler)

PASMO --hex CBIOS219.ASM CBIOS219.HEX

edit the last dataline of CBIOS219.HEX ...

:10FFE000000000000000000000000000000083FEA0
     |                                   | 
:10FFF000000000000000000000000000000083FE80

