Hello Paula,
I don't know how to contact Matthew Smith, but I know a person that might know. I have just e-mailed him. If he responds affirmatively, I will let you know (probably via a PM).
Daniel
Hello from Portugal. My name is Paula Silva, I'm a portuguese electronics engineer, trainer and CEO of PSiTech, an electronics R&D & repair company.
I'm creating a new ZX Spectrum interface, so I'm trying to get in touch with Matthew Smith regarding some historical research into his Tandy/TRS-80 development setup and the way he transferred his Spectrum programs from the Tandy. I'm particularly interested in the technical details of the system he used for Manic Miner and Jet Set Willy. If anyone has a current way of contacting Matthew, I'd be very grateful.