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Showing results for tags 'trs-80 model 4'.
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I have a huge TRS-80 lot for sale. Main computer is in good working condition. HARD DRIVE IS UNTESTED. Comes with lots of software (mostly operating systems), a printer spooler, a power splitter, and a bunch of reference manuals. This is a heavy lot (56 pounds), so to ship it across the country (e.g. Idaho to Florida) will be in the ball park of $150-$175. I WILL NOT SHIP OUTSIDE OF THE CONTINENTAL U.S., NO RETURNS. Please dm me with an offer!
Maybe someone at sometime will find this info useful. The Model III and 4 has a single 50 position I/O bus port for expansion. A company called Alpha Products used to sell a cable that allowed you to daisy chain multiple peripherals on that port. Unfortunately those haven't been available since the mid 80s. The port is a 50 position card edge. 50 position ribbon cable and female connectors are easily sourced. Amazon has the best price on the female connectors; less than $20 for 5. Anything with a 50 position card edge is next to impossible to find these days. Also each "finger" on the board needs to connect from top on one side to bottom on the other. The Radio Shack Hi-Res board came with one as a pass through. I recently found a source for dirt cheap prototype trans boards that can be modified in about 1 minute. https://www.circuitspecialists.com/pc622.html Syntax PC-622. These are 62 position and already have the reverse side connected. A cutting wheel on a Dremel will easily make it into a 50 position. You'll also want to bevel the edge a bit with a flat file. My port currently has the Hi-Res board (looped from inside like factory), FreHD (hard drive) and an Orchestra 90 all getting along together. I also have a mouse interface for CAD which I'll try as soon as I get a RS mouse.