Johnny Billquist wrote:

>On Fri, 6 May 2005, will kranz wrote:
>
>
>
>>I have a Vax-750 that I periodically attempt to boot, something like
>>once every 4 years, and its about time. I know this is a PDP newsgroup
>>but there has been a fair amount of Vax stuff recently and this is
>>actually sort of on topic.
>>
>>

>
>Other have probably already answered all the questions you pose, but to
>make a short stab at it anyway...
>
>No, the VAX-11/750 cannot boot RT11. The VAX-11 machines have a PDP-11
>compatibility mode, but that is for user mode programs only. No operating
>system stuff is possible.
>VMB is the boot program for VAXen, and microVAX have VMB in rom. The
>11/750 is actually a special case, in that actually first loads a boot
>block from the boot device (whatever disk) and then proceeds from there.
>But VMB is still the normal boot path. However, things like 4.3BSD didn't
>use VMB.
>
>CI780 is the microcode for the CI-780 controller. I don't think the CI-750
>used the same microcode, which makes it weird you should have, or need
>that microcode on your 11/750.
>
>CI is computer interconnect. A (for the time) fast communications channel
>between clustered VAXen and disk controllers.
>
> Johnny
>
>Johnny Billquist || "I'm on a bus
> || on a psychedelic trip
>email: bqt@update.uu.se || Reading murder books
>pdp is alive! || tryin' to stay hip" - B. Idol
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>

IIRC the CI750 and CI780 were the same boards with a different bus interface... The same microcode could've been used.

Bill



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