[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Old Index]
Re: rtVAX300 .. need help..
On 2013-01-10 22:33, Rhialto wrote:
On Thu 10 Jan 2013 at 04:29:36 +0100, Johnny Billquist wrote:
Just a few short comments. The VAX internal registers are not memory
mapped, ever. That would be against the architecture specification.
Well, the thought isn't that strange. Iirc, the PDP-11 has its CPU
registers mapped (somewhere in high memory?) and the PDP-10 too (at
address 0, iirc).
Oh, yeah. And the PDP-10 don't really have registers as much as just
that one operator to instructions only have four bits, so the memory
locations possible to express are a bit limited. :-)
And they are called "accumulators"... ;-)
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt%softjar.se@localhost || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
Main Index |
Thread Index |