Here a solution I often use for such problems:
The only disadvantage of this solution you will need 2 bytes
of IMEM for each irq vector you want to use.
You have to compile your C Files with NOIV in the commandline

Thomas

1 write a assembler file
you have to link the ASM File with your Boot Code


extrn DATA (EXT_VECT)
extrn DATA (T0_VECT)


CSEG at 0003h
push EXT0_Vect+1 ;MSB
push EXT0_Vect+0 ;LSB
ret
org 0bh
push T0_Vect+1 ;MSB
push T0_Vect+0 ;LSB
ret
....

end


In your C files :

unsigned int EXT0_Vect
unsigned int EXT1_Vect

void InitEXTVect(UINT8 code *pc)
{
EXT_Vect=pc;
}

void InitT0Vect(UINT8 code *pc)
{
T0_Vect=pc;
}

void main (void)
{
InitEXT0Vect(Ext0IrqRoutine);
InitEXT0Vect(T0IrqRoutine);
EA=1;
...
}