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A comment on How could the early Unix OS comprise so few lines of code?. Parent comment

Re:How could the early Unix OS comprise so few lines of code? by thequux on Monday September 11, 2023 @12:04PM (#37469298)
The 11/70 had a 22-bit wide memory bus and an 18-bit wide unibus which was mapped to the high 256kb of the 4M physical address space.
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Re:How could the early Unix OS comprise so few lines of code? by inkyoto on Monday September 11, 2023 @11:44PM (#37476775)
You are correct. I have long forgotten about the mapped memory and was thinking about Unibus device registers having long 18-bit addresses. The 11/70 also had separate instruction and data spaces which did not exist in earlier models.
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