On 01/10/2013 10:44 PM, Johnny Billquist wrote:
PDP-11 CPU internal registers appear in I/O address space, with some exceptions: the general registers are not visible there except in the 11/10. (They have listed addresses, but those only work from the console, not from programs, with that one exception.) And yes, on the PDP-10, the general registers live at memory addresses 0 to 017.It's more than the 11/10, but it's also really weird, and I don't remember if it's front panel only, but you might be right on that one.
11/05 too, but that's the same machine. I'm pretty sure that's the only PDP-11 CPU that does that.
-Dave -- Dave McGuire, AK4HZ New Kensington, PA