That looks great, congratulations on getting it working again! I am mostly interested in DEC equipment, but the TRS-80 is one of the few micros I would like to have. I can't quite remember which model my school used to have, but I think it was a model I. You mention a technical reference which sounds really useful, is that online somewhere? I had a look on bitsavers and was surprised that there is nothing at all listed under Tandy or under Radio Shack. Manx lists some technical reference manuals, but not for the Model I. Regards Rob

As regards the monitors, the older one (the one you now have on the Level 1 unit) is a converted RCA portable TV. The exact convertion depends on the mains voltage. You see the original TV was designed for 115V (US) mains and had a hot chassis (not isolated from the mains). In all cases the tuners, sound section, speaker, etc were removed. Then : 115V model : The video IF PCB was replaced by an opto-isolated video input board (so the TRS-80 was isolated from the mains). The input side of this circuit took 5V from the TRS-80 PSU. 230V model : Since the TV chassis was designed for 115V input only, it needed a step-down transformer for 230V mains input. An _isolating_ transformer was fitted inside the monitor case so the chassis was now insolated. The video IF PCB was replaced by a simple 1-transistor (I think, maybe 2 transistors) video amplifier. This model just needs composite input from the TRS-80, the 5V supply is not used. The later one (which I have never seen inside) was sold in the UK with a moulded green plastic cover over the entire front, with holes for the knobs to poke through. This gave a 'green screen' display using the normal TV white CRT. -tony