Author: Ira

Marcel Erz has reverse engineered the Model I ALPS keyboard PCB. He says

This project is a faithful reimplementation of the ALPS keyboard PCB of the iconic TRS-80 Model 1 computer. My revision, the E1, is designed to replicate the PCB design 1-to-1 of the original down to the traces. The entire project is available under the MIT license.

Visit the GITHub Page for gerber files, Bill of Materials (CSV and PDF formats), layers exported in PDF and SVG formats, and full schematics of the E1 replica which is 1:1 to the original G board.

A site visitor has a working Model 4 (or at least drive :0 does) for sale for $300 for local pickup. Unit does have a loose connection in the plug at the power supply that powers the CRT filament, although most of the time the connection is good as is. Probably an easy fix. Drive 1 works when in Drive 0 position, so perhaps there is an issue with the controller or cable for the :1 position.

Seller is located about 100 miles NW of San Antonio, TX a few miles off of I-10; and could meet in or around Kerrville, Texas if that’s better.

If this sounds good, please reach out directly to Brick Parrish at .

Shawn Sijnstra has updated his Infocom Executors … Model 1 and 3 to version 7 and Model 4 to version 17.

Full list of credits, features and issues as well as the source and compiled code are in the Gitlab page:

• Model 1
• Model 3
• Model 4

Lawrence Kesteloot has updated his TRS80TOOL to v2.6.0. Release Notes:

• Better handling of double-sided disks.
• Assembler:
  • Full expression support: All the operators in C, with their same precedence.
  • Assembles about 10 times faster.
  • Allow nv and v for po and pe flags.
  • Various compatibility improvements with zmac.
  • Breaking change: No longer permit % as binary prefix. Instead of writing %1010, use 1010b or 0b1010.
• Disassembler: Add –upper flag.

You can download it at Lawrence’s web site or by clicking here.

Marcel Erz has put up a GitHub with assorted Model I parts which can be 3-D Printed!

Currently present are:

• Main Enclosure Panel
• PCB Stand-Off
• Keyboard Stem (ALPS)
• Keyboard Spacebar Clip
• Keyboard Clip
• Keyboard Button Placeholder (Enter)
• Keyboard Shield
• Extension Interface Cover (Medium)

You check it all out at https://github.com/RetroStack/TRS-80-Model-I-3D-Objects.