D Bit
Developer of Ersatz-11, a software PDP-11 emulator for MS-DOS,
Windows,
Linux,
OS/2, and
bare-metal PCs giving emulation speed far faster than
the PDP-11/93. The free demo version may be used for
30-day commercial evaluation, or unlimited personal/hobby use. Information
about commercial versions is available here. Take
a live RSX11M+ V4.6 system for a test drive
here.
Ersatz-11 emulates an entire PDP-11 system in software while running
on low-cost PC hardware. It outperforms all of the hardware PDP-11
replacements on the market, outstripping them by a particularly wide margin
in disk-intensive applications. Hardware PDP-11 replacements that use a
Q-bus, Unibus, or ISA bus for I/O can't come close to Ersatz-11's disk
performance because they are limited to the speed of the I/O bus for all disk
transfers, regardless of actual disk (or disk cache) speed. Ersatz-11 avoids
this bottleneck since it uses the PC's main memory and takes advantage of
the tight disk-to-memory coupling in modern PCs.
Ersatz-11 is by far the least expensive PDP-11 replacement product on the
market. It quickly pays for itself in reduced maintenance, power, and climate
control costs. Since its CPU is powered by the PC's processor and not a
special-purpose processor card, there's no expensive custom hardware to
maintain, and future upgrades to the PC's processor will make its PDP-11
emulation even faster.
Orders for Ersatz-11 are usually shipped out the same day.
Ersatz-11 features (Note: not all are available in Demo
version)
Processor emulation:
PDP-11/03, PDP-11/04, PDP-11/05, PDP-11/10, PDP-11/20, PDP-11/23,
PDP-11/24, PDP-11/34a, PDP-11/40, PDP-11/44, PDP-11/45, PDP-11/53,
PDP-11/60, PDP-11/70, PDP-11/73, PDP-11/74[1], PDP-11/83,
PDP-11/84, PDP-11/93, or PDP-11/94 CPU with individually selectable CPU
features
FP11/FPF11/FPJ11/etc. floating point processor
4 MB main memory
KW11L line clock (50/60 Hz, settable)
Display register (using special hardware, in DOS versions only)
([1]experimental feature provided without support)
Disk devices:
A very wide range of PDP-11 disk devices may be emulated using several forms
of physical media. Click here for information.
Tape devices:
Similarly, a variety of PDP-11 tape devices are supported. Click here for a list.
Serial ports:
E11 emulates RS232 and 20 mA serial ports and multiplexors using external
ports and/or emulated VT100 sessions. Click here for
details.
Network interfaces:
The efficient Ethernet subsystem allows DECnet, LAT, TCP/IP, or other
protocols to work through a regular PC Ethernet card, with higher throughput
than the original PDP-11 ports. Click here for
more information.
Video displays:
VT11, VT30, and Terak 8510/a graphics displays are emulated in all but the
Linux version of E11.
Bus adapters:
The "full" versions of E11 include support for Q-bus and Unibus adapters, so
that real hardware may be attached to the virtual PDP-11. Click here for information.
Miscellaneous devices:
E11 also supports digital I/O devices, graphics devices, and programmable
clocks, as well as dynamically installable plug-ins which allow custom or
user-written device emulations to be added to E11 at runtime. Click here for information.
Other features:
Versatile command language for controlling and monitoring emulation
Configuration may be modified without halting or rebooting emulator
Extensive logging facilities for capturing controller commands,
terminal and line printer output, and Ethernet traffic
Automatic configuration of floating CSR/vector addresses
Automatic selection of controller types based on emulated CPU type (for
devices such as the RL11/RLV12 whose Q-bus and Unibus versions have
programming differences)
D Bit
since October 5, 1998