---
title: "Building an RS-232 Port into the 2050 Modem"
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published_at: "2026-03-15T01:04:03+00:00"
modified_at: "2026-03-15T01:04:04+00:00"
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excerpt: "Step-by-step guide to adding a Zebra Systems RS-232 circuit board inside the TS2050 modem case, selectable via a 3PDT mini-switch mounted in the back panel. Rather than housing the circuit in a separate external box, Latker drills into the modem case, cuts PCB traces, adds jumper wires to pins 3, 17, and 22 of the…"
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  - name: "Loren Latker"
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    title: "Timex Sinclair Users Group Mile High Chapter June 1987"
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pages: "2"
pubdate: "June 1987"
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---

# Building an RS-232 Port into the 2050 Modem

Step-by-step guide to adding a Zebra Systems RS-232 circuit board inside the TS2050 modem case, selectable via a 3PDT mini-switch mounted in the back panel. Rather than housing the circuit in a separate external box, Latker drills into the modem case, cuts PCB traces, adds jumper wires to pins 3, 17, and 22 of the 8251 UART, and wires directly to a Break-out Adapter (Dick Smith Electronics). Includes a modem-eliminator wiring configuration and Memorywriter communication option settings.