[Info-vax] In memoriam: 10 years since Alpha's passing away.

Johnny Billquist bqt at softjar.se
Wed Jul 6 21:48:29 EDT 2011


On 2011-07-06 22.36, Bob Koehler wrote:
> In article<iv273r$5af$1 at Iltempo.Update.UU.SE>, Johnny Billquist<bqt at softjar.se>  writes:
>>
>> It's not a SYSGEN issue, as it is not a software thing. It's a hardware
>> limitation which is very hard.
>
>     Hardware limitations kept earlly VAXen from addressing more than 30
>     bits in hardware space.
>
>     SYSGEN can limit how much virtual address space you can map, due to
>     controlling the size of the map (number of page table entries in the
>     process header).

True. Software can restrict you to even less than 30 bits, but it cannot 
give you more.

	Johnny




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