Release date: 
Wednesday, 1 March, 2017
US $4999



Authors/Port authors:

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.

Ersatz-11 available as free demo version (the One of each disk/tape controller type, 256 MB maximum total size of all disks), may be used for 30-day commercial evaluation, or unlimited personal/hobby use. The full version handles unlimited disk size, Massbus removable pack disks, PC multi-serial boards and Q/Unibus bus bridges.

This software is distributed as compressed package. You have to download and manually install it; if prerequisites are required, you will have to manually install them too.

Manual installation

Available as self-installer package: download the program and run it to install. See below for download link(s).

Following ones are the download links for manual installation:

Ersatz-11 v. 7.3 (1/3/2017, D Bit Inc.) Readme/What's new
A version of Ersatz-11 is available for OS/2 or eComStation. While E11 customers haven't exactly been clamoring for this version, it exists and D Bit plans to continue supporting OS/2 in future releases of E11. The OS/2 version has reduced device support compared to other versions but it runs quite well. OS/2 handles multithreading a bit more naturally than Win32 does, and is an excellent fit to E11's internal structure.
Record updated last time on: 05/02/2019 - 06:22

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