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.
PDP-11 Emulation System
Click here to try out
a live RSX11M+ V4.6 demo system
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)
For more information contact
info@dbit.com
D Bit
15 Davis Hill Road
Royalston, MA 01368
Voice: +1 (413) 267-4600
FAX: (by appointment only -- call voice line first)
Copyright © 2024 by D Bit. All rights reserved.
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since October 5, 1998
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