It would be interesting to test running RT-11 over
this
emulated high speed TU58 link. It has a different s/w
driver architecture so it may (or may not) work ok.
While I can't speak to that exact configuration, I have
gotten RT-11 to run close to 115.2K on an LSI-11/2.
Rather than using a modified DL11, I'm running with
an MXV11 configured to take external clock. The TU58
emulation is a home-grown implementation running on
a 6809 SBC. At 115.2K, I did have to throw in a little
bit of inter-character delay, but not enough to slow it
down to the equivalent of 57.6K.
BLS