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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.
Free to a Good Home! TRS-80 Model III computer in good working order plus daisy wheel printer and software. If you are willing to travel to Montgomery County, Maryland, to pick it up, it's yours. For more info, please contact me at [email protected] Details: Hardware TRS-80 Model III Computer Extras: antiglare screen overlay; dustcover Daisy Wheel Printer DW 210 Extras: connector cable; tractor feed; dustcover; Pica and Elite wheels; 6 ink cartridges (ribbons) Software Model III TRSDOS Disk Operating System and Basic Interpreter #26-0312 Diskette Documentation: Disk System Owner's Manual Documentation: Start-Up Card Profile III Plus #26-1592 Creation Diskette and Runtime Diskette Documentation: Software Library Binder Documentation Help: Crest Software's "PLUS EXPLAINED" Superscripsit #26-1590 Diskette Diskette for Proofread Program Documentation: Software Library Binder Documentation: Superscripsit Reference Manual Documentation: Card of most used actions VisiCalc #26-1569 Diskette Documentation: Personal Software VISICALC binder Games Zork diskette and documentation #26-1951 Monty Plays Monopoly diskette #26-1952