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AI Engineering
Hacker News·Aug 27·5 min read
French CII's Mitra-15 in SIMH. Work in Progress
TL;DR
A preliminary Mitra-15 simulator is being developed using modified code from an existing SDS 940 simulator. This project aims to preserve the legacy of the Mitra-15 microcomputer, which was significant in various fields during the 1970s.
✦ Why It Matters
Explore legacy computing systems to enhance your understanding of historical technology and its evolution.
Key Takeaways
- Contribute to the preservation of computing history through the Mitra-15 simulator.
- Explore the unique microcode-driven I/O programming of the Mitra-15.
- Test and provide feedback on the current simulator features.
- Consider challenges in porting software to the Mitra-15 architecture.
Full Summary
The Mitra-15, a 16-bit minicomputer from the early 1970s, was significant in various fields but has limited surviving documentation. The current project involves creating a simulator for the Mitra-15 within the SIMH environment, which allows for the emulation of historical computing systems.
The developer started with an SDS 940 simulator, modifying it to reflect the Mitra-15's unique characteristics, such as its microcode-driven I/O programming. Progress includes a working instruction decoder, basic device communication code, and a test program.
Future plans involve reconstructing the original Real-Time Monitor software and potentially porting RSX280 to the Mitra-15, despite challenges like fewer registers and addressing modes. This effort contributes to preserving an important part of computing history.