On 2018-09-07 00:38, Eric Smith wrote:
On Thu, Sep 6, 2018 at 4:31 PM, Johnny Billquist <b...@softjar.se
<mailto:b...@softjar.se>> wrote:
Well, you'd probably also need to deal with the Unibus map handling,
since those addresses also do not generate accesses directly on the
memory bus...
Really? What's the highest physical address the Unibus map supports?
Uh? The Unibus map is for translating 18-bit addresses to 22-bit
addresses. And it can translate all of it. In fact, you can (at least in
theory) go a bit above 22 bits that way.
If you look at the physical address space of the 11/70 however, the low
3840 bytes are doing on to the memory bus. 3840 to 4088 is going to the
Unibus memory space, which is remapped by the Unibus map, if enabled.
And the last 8K goes to the Unibus.
Johnny
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: b...@softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
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