TMS1000 Processor and Dumping

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Hi

In the 1970-80s the 4 bit TMS1000 was used in lots of games, Speak and Spell, and consumer products, microwaves etc, including a model railroad controller called the Hornby Zero One.

Would like to upgrade slightly the code for the controller by adding some more locomotive addresses. Has 16, need to go to say 64.

Apparently there is a way to download the existing code thru a test port, does anyone know of this ?
What I would like to have done is to download the code, make amendment for the number of addresses and then upload onto a modern 8-bit chip.

Is this reasonably simple !! Is there someone out there who has done this?

Thanks

Charles Harris