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If anyone is in need of the USBPUT.COM program that will send a file from a CP/M machine to a PC using the S100Computers Serial I/O board I have modified the Mike Douglas program 'PCPUT' to work with a USB port. I'm sure this is out there somewhere, but I couldn't find it...only the USBGET.COM...

3-19-19 Replacement Power Switch TRS-80 Model 1: If anybody needs a new on/off power switch for their TRS-80 Model 1 (or expansion interface) I have found a C&K switch from DigiKey that is a good replacement. The switch is a 4PDT switch that comes in Tin or Gold (Gold shown here). It does...

2/27/19 - Power Supply for TRS-80 Expansion Interface I have been trying to learn KiCad for a while now but I needed a simple project to get started. I recently acquired a Radio Shack Expansion Interface off Ebay so I though a power supply might be a good project. After drawing up the...

In case anyone is looking for a power supply for their Model I, I have posted a writeup on Ira Goldklang's TRS-80 Revived Site (www.trs-80.com/wordpress) under site news and hardware. It is similar to the one described by chromedome45 but is a stand alone unit external to the expansion...