[HECnet] RT-11 on a PDP-11/10

[Oleg Safiullin]

> But I suffer memory loss here, what is that your patch does? I recall

I need more info to look what's happening at 11/10 :)
My patch just disables instructions to test if terminal outpur interrupts are disabled (no pending output in RT-11). I don't know 
why tetris does this (it uses RT-11 standard tty i/o directives then).

> What are the memory requirements for running TETRIS.SAV?

TETRIS uses addresses 1000-32416, no MMU required :)