[Simh] Is it possible to simulate the first Vaxen I ever used?

[Johnny Billquist]

On 2020-03-23 16:35, Bob Eager wrote:
> On Mon, 23 Mar 2020 08:10:17 -0700
> "Robert Armstrong" <bob at jfcl.com> wrote:
> 
>>> FUBAR is the name of a 780 CSR (in the UBA: failed unibus address
>>> register);
>>> perhaps it was used in the 730 as well.
>>
>>    The 730 certainly had a UBA; don?t know if had a specific "FUBAR"
>> register though.  But as far as a physical bar inside the chassis
>> I've never seen nor heard of anything like that.  I have a 730 in the
>> garage and it doesn't have any such thing.  The 730 fit into a single
>> 10-1/2" chassis anyway, so there wasn't even a specific cabinet or
>> rack dedicated to the 730.  And the 730 chassis was basically the
>> same box as was used for the 11/44, but with a somewhat different
>> backplane.
>>
>>    I suspect the "FUBAR" at Dan's high school may have been a local
>> joke :)
> 
> Not at all. It existed on the 780, at the very least, so most likely
> elsewhere. Mentioned in the VAX11/780 Hardware Handbook (e.g. the
> 1979-80 edition).
> 
> See:    http://www.tavi.co.uk/FUBAR.jpg

Yes, the DW780 have a FUBAR register, just as Bob notes. But the thing 
is, you will not see anything about it if you open up the cabinet. It is 
not a "physical" bar inside the cabinet.

I strongly suspect Bob is right that it might have been some local joke 
or hack at Dan's high school.

   Johnny

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