● Covered by 1 source · 1 reportLow impact1 neutral
Restored PDP-11/83 with Mentec M11 Processor Serves Web Page on 2.11BSD Unix
Key points
- PDP-11/83 system restored with Mentec M11 processor.
- System runs 2.11BSD Unix and serves a live web page.
- Includes classic disks, magnetic tape, and serial terminals.
- Uses a mix of DEC and Emulex controllers.
System Overview
A PDP-11/83 system has been restored and is currently serving a web page. The system is powered by a Mentec M11 processor, which integrates the CPU and memory onto a single board, replacing the original M8190 and separate memory boards. The setup includes two Q-bus chassis interconnected by M9404/M9405 pairs.
Hardware Configuration
The system incorporates a variety of controllers, including an M7555 RQDX3 for MFM disks, an Emulex UC07 for SCSI bridging, an M8061 RLV12 for RL02 drives, and an M7504 DEQNA Ethernet controller. Storage components include RA82 and dual RA92 drives via MSCP, MFM hard disks, RX50 dual floppies, RL02 pairs, and TKZ50 tape storage. An M3104 serial multiplexer handles terminal lines.
Software and Networking
The PDP-11/83 runs 2.11BSD Unix, which includes a native C compiler, networking capabilities, and a small HTTP server. Networking is handled by a DEQNA Ethernet controller using the BSD if_qe driver, providing TCP/IP connectivity on the 16-bit Unix system. Serial terminals are connected through the M3104.
Architectural and Operational Notes
The Mentec M11 processor runs PDP-11 software with onboard memory and features 22-bit memory management. MSCP storage provides a uniform presentation for disks and tapes. The system utilizes console ODT for memory and device register examination. For reliability, a front-end cache reduces repeated homepage requests, and browser updates pause when the page is hidden.
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Reporting from
A restored PDP-11/83 system, featuring a Mentec M11 processor and running 2.11BSD Unix, is actively serving a web page. This project demonstrates the operational capability of vintage hardware with modern components and classic software.