VAX-11/730 %BOOT-F-Unexpected Machine Check

Johnny Billquist bqt at
Tue Jun 9 17:30:02 CDT 2015

On 2015-06-09 23:54, Mark J. Blair wrote:
>> On Jun 9, 2015, at 14:43 , Johnny Billquist <bqt at> wrote:
>> Yes, R5 is more or less used the same on all VAXen, since this is used by VMB, which almost all VAXen use in one form or another.
> Thank you very much for the R5 details!
> I presume that the other registers and the VMB.EXE that reads them are probably machine-specific, as I see all sorts of arbitrary-looking numbers stuffed into them depending on which device the ddnBOO.CMD file corresponds to.

It is very bus and controller specific, so it varies extremely much, yes.


Johnny Billquist                  || "I'm on a bus
                                   ||  on a psychedelic trip
email: bqt at             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol

More information about the cctalk mailing list