Never-11s and other interesting machines
PDP-11/74: A four-way SMP configuration with four /70 processors and CIS integrated. There are two versions of the answer to the question "Why did they cancel this project?". One says, that the backplane interconnect was way too complicated, so the system would have been too expensive. The other is that such a machine would have eaten into the market share of a 32-bit machine, known as the VAX.
PDP-11/68: This was to be a 16-processor machine, with each processor beeing equal in performance to the /74 mentioned above.
PDP-11/110 és /120: ???
ECL-11: A 18-bit machine built at CMU
Falcon SBC-11/21 (KXT11):This was a single-board computer based on the T-11 chip, with 32KW addressing range, two saynchronous serial and one parallel intarfaces and 4 KByte on-board memory. It was designed for real-time applications running/developed under RT-11/Macro-11 or Micropower/PASCAL.
HeathKit H-11: A qbus -11 by Heathkit, that ran the company's altered (?) RT-11-version, HT-11.
MINC-11: A -11 for laboratory measurements.
Computers built in Hungary during the "Cold War"-years by the Central Research
Institute for Physics. The full TPA-series ranged from PDP-8 clones to
VAX-copies, some of them reverse enginered, some designed from scratch.
They were compatible with the original DEC machines, and could run the
Note: I'm intended to start a website dedicated to clones built in the Eastern Bloc, please mail me if you have any information on some of these computers (like the SM3, SM4, SM1420/xx, Elektronika and Robotron machines, etc)!
PDP-10, DECsystem-10, DECSYSTEM-20 frontend processor: These systems had a /20 or /40 as the frontend processor. These -11s had a different color layout, green and blue.
VAX Console: VAX11-780 systems had a /03 as frontend processor. The VAX 85xx series had PRO3xx conoles, while the VAX 86xx's FEP is based on the T-11 microprocessor. The PRO "VAX Consoles" ran P/OS, the T-11's used RT11.
Other: HSC intelligent storage controllers (like the HSC50), DEUNA/DEQNA Ethernet- and RQDX1, 2 and 3 disk controllers, the qbus-based DECserver 500/550 terminalservers all use PDP-11 microprocessors (T11 and J11).
Embedded applications: Quite a few electronic devices were based on -11 CPU's, like telephone exchanges, CTG's and other medical equipment (Siemens for example), process controlling and alarm systems, simulators, even laser printers (like the Xerox 8700 and 9700 series), just to name a few. The PDP-11 was (and is) heavily OEM'ed, it was an industry of its own...