products:

Re39 Interactive Disassembler for C29/C39

Re39 is a DOS-based disassembler for the Rockwell C29/C39 microcontroller used in many modern modems. It was developed to assist with reverse-engineering modem firmware as part of a technical support contract with the company formerly trading as Zoom Telephonics Australia. (Note: The company in question, this product, and the author have no connection with the entity now trading as Zoom Telephonics Australia).

Although this program was originally written as a very quick and dirty hack solution to the immediate problem of finding and removing certain code in a customized modem ROM, it has survived as a useful tool for me for some time, and I am contemplating rewriting it, with a graphical interface, in Java (primarily as an educational exercise).

Read the documentation for this product.

Read the C sourcecode for this product.

Read an opcode list for the C29/C39 (Microsoft Word 6.0 format).

Download the Re39 distribution archive.

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