TMOG-11 / System activity
LIVE · 2.11BSD
Awaiting snapshot · cached 5s · 2.11BSD
Digital DNA • 1980s engineering
PDP-11 power with modern polish
A restored PDP-11/83 with a Mentec M11 processor, two chassis, and a mix of DEC and Emulex controllers. Classic disks, magnetic tape, serial terminals, and 2.11BSD keep this collection connected to its roots.
Q-bus System Mentec M11 processor Onboard memory RQDX3 • UC07 • KDA50
The live panel above shows the system serving this page.
CPU Complex
Mentec M11
A single-board PDP-11-compatible CPU with onboard memory, replacing the M8190 and two memory boards.
Memory
Onboard RAM
The M11 combines CPU and memory on one board. TMOG-11 reports the serving system's physical RAM, usage, and swap.
Bus + Timing
Q22
Two Q-bus chassis interconnected by an M9404/M9405 pair, with adapters for storage, Ethernet, and serial I/O.
Kernel
2.11BSD
PDP-11 UNIX with a native C compiler, networking, and a small HTTP server. The live panel reports kernel and process activity.
Controller Stack
- M7555 RQDX3 for MFM disks and dual RX50
- Emulex UC07 SCSI bridging disk + tape to Q-bus
- M8061 RLV12 for dual RL02 drives
- M7504 DEQNA Ethernet controller
- M7165/M7164 KDA50 pair for RA8x/RA9x MSCP
- M3104 serial multiplexer for terminal lines
Storage & Media
- RA82 + dual RA92 on MSCP via KDA50
- MFM hard disk on RQDX3 for bootstrap and swap
- RX50 dual floppies for field media
- RL02 pair on RLV12 for legacy images
- TKZ50 tape storage via UC07
- Removable disk and tape media for preserving software
Networking & Services
- DEQNA Ethernet with the BSD if_qe driver
- Serial terminals connected through the M3104
- TCP/IP networking on a 16-bit UNIX system
- Small HTTP server with a cached TMOG-11 sampler
Architecture Notes
- Mentec M11 runs PDP-11 software with onboard memory
- 22-bit memory management, SPL-aware drivers
- MSCP storage for uniform disk/tape presentation
- Console ODT for examining memory and device registers
- Q-bus grant continuity links controllers across both chassis
System Inventory
Boards and devices in the collection, with the M11 CPU upgrade reflected below.
| Component | Role |
|---|---|
| Mentec M11 | CPU and onboard memory |
| M3104 | Serial multiplexer |
| M7555 RQDX3 | Disc controller |
| Emulex UC07 | Disc controller |
| Emulex UC07 | Tape controller |
| M7504 | Ethernet controller |
| M7165 | KDA50 controller |
| M7164 | KDA50 controller |
| M8061 | RLV12 disk controller |
| M9404 | Bus source |
| M9405-YB | Bus target |
| RA82 | Hard drive |
| RA92 | Hard drive |
| RA92 | Hard drive |
| RX50 | Floppy drive |
| TKZ50 | Tape drive |
Reliability & Tuning
- One shared TMOG-11 snapshot, cached for five seconds
- Browser updates pause when the page is hidden
- A front-end cache reduces repeated homepage requests
- Source, site assets, and restore instructions preserved in Git
Boot & Maintenance
- MSCP disk boot through the storage controllers
- RL02 provides an alternate boot path
- Backup rotation to TKZ50; periodic RL02 imaging
- Console ODT scripts for fast diagnostics