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  • Joined Dec 20, 2025

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rcl9/README.md

Welcome to Rob's 1970's and 1980's Retro Computing Archive.

During the late 1970's and 1980's I was a hard-core, low-level, prolific software and hardware developer, a "builder of everything". This Github site will strive, amoung other goals, to bring some of those projects back to life in a documented and open source manner. Fortunately I had documented, archived and stored away most of those projects at the time for future historical recollection.

Generally speaking, the documentation will primarily be of interest to Z-80 and CP/M-80 people, along with some other related projects relating to MIDI music machines and peripheral hardware pinned to the 1980s. A focus will also be made to document some machines for future historical reference.

Some of my 1980's computers related to these projects may include:

The main landing page for external search engines is here.

You can reach me at RetroComputingArchive@gmail.com. I do not have a YouTube channel nor a dedicated Web site for my retro computing work.

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  1. Imagery-of-Past-Projects Imagery-of-Past-Projects Public

    This repository contains a visual photo snapshot of some of my more interesting 1970s to late 1980s personal projects

  2. MultiFlex-Z80-H19-Terminal-Emulation-ROMs MultiFlex-Z80-H19-Terminal-Emulation-ROMs Public

    This project documents the 3 new ROMs for the Exceltronix Multiflex Z80 terminal board of the 1982-era. These provide for updated and new Heathkit H-19/VT52 terminal emulation support.

    Assembly

  3. Cypher-Z80-68000-Single-Board-Computer-1984-by-Motel-Computers---History-and-Documentation Cypher-Z80-68000-Single-Board-Computer-1984-by-Motel-Computers---History-and-Documentation Public

    This repository strives to provide a historical snapshot, archive and description of the short lived Cypher Z80/68000 single board computer which was designed, built and sold by Motel Computers of …

  4. Cypher-Z80-68000-Single-Board-Computer---Running-CPM-3-via-the-HxC-Floppy-Emulator Cypher-Z80-68000-Single-Board-Computer---Running-CPM-3-via-the-HxC-Floppy-Emulator Public

    This repository explains how to build and boot CP/M-3 for the Cypher Z80/68k SBC from the HxC floppy emulator.

    Assembly

  5. Roland-JX8P-Synthesizer-Memory-Cartridges Roland-JX8P-Synthesizer-Memory-Cartridges Public

    Two hardware designs for Roland JX8P memory cartridges with 256 patches in 8K.

    C++

  6. Roland-JX8P-Synthesizer-Patch-Collection Roland-JX8P-Synthesizer-Patch-Collection Public

    This repository contains 15 Roland JX8P synthesizer patch banks, with up to 16 voices per bank,