9 May
2012
9 May
'12
2:02 p.m.
On Wed, 9 May 2012 09:04:07 -0700, "Michael Holley"
<swtpc6800 at comcast.net> wrote:
I was told the load from hard disk was page fault the
swapped the desired
data back into memory.
Michael Holley
-----Original Message-----
From: cctalk-bounces at classiccmp.org [mailto:cctalk-bounces at classiccmp.org]
On Behalf Of Tom Uban
Sent: Wednesday, May 09, 2012 5:33 AM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: More photos from VCF East 8
One note on the PDP-11/03 booting the VAX-11/780, the PDP-11/03 first loads
the microcode into the VAX-11/780, thereby defining the machine's higher
level of operating code, then a bootstrap to load from a particular hard
disk or tape is run. On most PDP-11s, the microcode is stored in ROMs or is
hard wired.
VMS always loads a program by page faulting it into memory. That
mechanism would AFAIK not work for booting, because the whole paging
software, disk drivers etc would have to be loaded and initialized
first. I don't remember offhand what it says in the VMS internals book
about booting, but I could look it up.
/Jonas