10 Mar
2016
10 Mar
'16
2:46 p.m.
The OP was specifically asking about RT11 on a Heathkit H11, not "just any
ol' LSI-11".
Very possible I'm completely incorrect here, but I thought I recalled that
DEC gave heathkit a special price on H11 boards and OS license and such - so
that Heathkit could produce the system for a price that the home user could
actually afford back in the day. And because DEC was highly concerned that
someone would buy a card or item from Heathkit and use it in a "real DEC
PDP11" (business channel) where it would cost a lot more money normally -
they did *something* to introduce an incompatibility of some sort between an
H11 and a "real" pdp11?
J