#include <stdio.h>
#include <string.h>
 
int main( int argc, char **argv )
{
   long int  fp_val = 0x80c000;
   char      input_buf[ 999 + 1 ];
   int       done = 0;
 
   /* If a different base is ever required...
    *
    * printf( "Enter fp value for this ROM (eg. 80c000)\n");
    * 
    * scanf( "%lx", &fp_val );
    */
 
   printf( "\nfp = 0x%.6lx\n", fp_val );
 
   do
   {
      printf( "\nRelative address (q to quit):" );
 
      scanf( "%s", input_buf );
 
      if ( 'q' == input_buf[0] )
      {
         done = 1;
      }
      else if ( '-' == input_buf[0] )
      {
         long int decval;
 
         sscanf( input_buf, "%ld", &decval );
 
         printf( "(%s,fp) is address 0x%.6lx, Table Reference %lx\n", input_buf,
                 fp_val + decval,
                 0x10000 + decval );
      }
      else if ( 4 == strlen( input_buf ) )
      {
         long int hexval;
 
         sscanf( input_buf, "%lx", &hexval );
 
         printf( "Table Reference %s is (%ld,fp), address 0x%.6lx\n", input_buf,
                 hexval - 0x10000,
                 fp_val - 0x10000 + hexval );
      }
      else if ( 6 == strlen( input_buf ) )
      {
         long int addval;
 
         sscanf( input_buf, "%lx", &addval );
 
         printf( "Address 0x%s is (%ld,fp), Table Reference %lx\n", input_buf,
                 addval - fp_val,
                 addval - fp_val + 0x10000 );
      }
      else
      {
         printf("???\n");
      }
   }
   while (!done);
 
   return 0;
}

[michaelgo@papmdbbldp02 address]$ make address
g++     address.cpp   -o address
[michaelgo@papmdbbldp02 address]$ ./address

fp = 0x80c000

Relative address (q to quit):809ba8
Address 0x809ba8 is (-9304,fp), Table Reference dba8

Relative address (q to quit):dba8
Table Reference dba8 is (-9304,fp), address 0x809ba8

Relative address (q to quit):-9304
(-9304,fp) is address 0x809ba8, Table Reference dba8

Relative address (q to quit):q
[michaelgo@papmdbbldp02 address]$

 0x8ad18:    a0 9d c8 10     ldub r0,@(-14320,fp)         (...this is 0x808810)
 0x8ad1c:    02 f0 7c 58     btst #0x2,r0 -> bc 0x8ae7c
 0x8ad20:    7f 53 f0 00     bra 0x8ae6c || nop
 0x8ad24:    80 c0 00 ff     and3 r0,r0,#0xff
 0x8ad28:    61 00 62 01     ldi r1,#0 -> ldi r2,#1
 0x8ad2c:    b0 01 00 54     beq r0,r1,0x8ae7c
 0x8ad30:    b0 02 00 38     beq r0,r2,0x8ae10
 0x8ad34:    63 02 64 03     ldi r3,#2 -> ldi r4,#3
 0x8ad38:    b0 03 00 38     beq r0,r3,0x8ae18
 0x8ad3c:    b0 04 00 39     beq r0,r4,0x8ae20
 0x8ad40:    65 04 66 23     ldi r5,#4 -> ldi r6,#35
 0x8ad44:    b0 05 00 39     beq r0,r5,0x8ae28
 0x8ad48:    b0 06 00 5d     beq r0,r6,0x8aebc
 0x8ad4c:    67 06 61 07     ldi r7,#6 -> ldi r1,#7
 0x8ad50:    b0 07 00 38     beq r0,r7,0x8ae30
 0x8ad54:    b0 01 00 3c     beq r0,r1,0x8ae44
 0x8ad58:    61 08 62 09     ldi r1,#8 -> ldi r2,#9
 0x8ad5c:    b0 01 00 48     beq r0,r1,0x8ae7c
 0x8ad60:    b0 02 00 3e     beq r0,r2,0x8ae58