I have 20+ years of assembly language embedded systems programming specifically with the Freescale 8 bit MCUs (like the HC05 series 68HC705KJ1 and the 9S08/HCS08 series such as the QG8 which I also use quite a bit.)
My assembler is this: [login to view URL]
If interested, please contact me.
(P.S. I have assumed you have the source code of the original and not just the S19 (object) file. In the latter case, disassembly would be required which is a different job at a higher cost.)