18 Apr
2025
18 Apr
'25
4:48 a.m.
Jos, I am curious why you are developing a new PDP-11 simulator? There are
a few other existing simulators or emulators.
Thanks
Tom
On Fri, 18 Apr 2025, 1:31 am Jos Fries via cctalk, <cctalk(a)classiccmp.org>
wrote:
Milo Velimirović wrote:
Check the PDP-11 Architecture Handbook (1983-84)
Appendix A — Assignment
of Addresses and
Vectors, for DEC’s preferred addresses for
devices. The default address
for an RK11 is
777400 with an interrupt vector of 220. You can
put it anywhere you want
that doesn’t
conflict with another device, but the benefit of
using the DEC default
is that things like
bootstrap code and pre-built s/w images will find
and use it at the
default address.
—Milo
Yes, i do realize that. The reason I was asking this is because I want to
code the RK11-D device in my PDP-11 simulator (
https://github.com/friesga/sim-11) as faithfully as possible, including
the device configuration.
Jos