Even the hobby version of Ersatz-11 is able to run all
versions of
RT-11, but a license is required to legally do so. On the other hand,
SIMH is available and there is a hobby license from Mentec which
allows the 1985 V5.03 of RT-11 to be legally run by a hobby user.
...
The commercial version does cost $ US 2999 for DOS/W95/W98/NT.
However, when running the RT-11 operating system, there are sufficient
resources (about 300 KBytes of emulated PDP-11 memory) and hard
disk devices (up to 32 MBytes) to be sufficient for almost all applications.
So while I admit that having the commercial version is extremely convenient,
the extra features (all 4 MBytes of memory and unlimited hard disk devices)
only make things easier to do and test.
simh is the only one I can use as I don't have any DOS/W95/W98
systems, and the hobby version doesn't run on W2K/WXP. With
simh I can use a Linux version (preferred) or a W2K/WXP version.
--
Eric Dittman
dittman(a)dittman.net
Check out the DEC Enthusiasts Club at
http://www.dittman.net/