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d bit ersatz 11 pdp 11 emulator 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 pdp 11 emulation 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 2026 by d bit all rights reserved you are visitor number since october 5 1998 products pricing 8 floppy adapter arduino reflow shield download projects links legal