[Simh] vax780 bare metal - rq addresses --> rq registers

[Mark Pizzolato]

And there is:

         sim> SHOW UBA IO
or 
         sim> SHOW -o UBA IO

Maybe you can explain more about where you going with this...

- Mark

On Wednesday, May 13, 2020 at 5:23 PM, Johnny Billquist wrote:
> Oh, and yes, there might be issues with 32 bit access, since the Unibus is only
> 16 bits wide. Also, you might need to enable the Unibus adapter before you
> can get to anything sitting on it.
> 
> I can't remember the details, but the documentation for the Unibus adapter
> (DW780) is also on the net, so you just have to look it up...
> 
>    Johnny
> 
> On 2020-05-14 02:18, Johnny Billquist wrote:
> > It's a little complicated, because the controller is on the Unibus,
> > and the Unibus only have an 18-bit address space.
> > So the SBI Unibus adapter contains a mapping between the VAX address
> > space, and the Unibus address space, and the UBA also contains mapping
> > for DMA, which must be set up before playing around. So there are
> > layers you need to go through.
> >
> > Also, the MSCP controllers only actually have two registers on the
> > bus, and they are only really used for anything more advanced than
> > just getting the attention of the controller at initialization. After
> > that, all communication happens through buffers.
> >
> >    Johnny
> >
> > On 2020-05-14 02:14, Mike Stramba wrote:
> >> What is the relationship / mapping between the addresses displayed
> >> for the SHOW RQ  (disk controller) command and the listed registers
> >> in the
> >> vax780 manual ?
> >>
> >> E.g  SA, S1DAT, CQBA etc ?
> >>
> >> i.e. Does the SA register appear  /  is accessed at 2013F468 ?
> >>
> >> S1DAT at 2013F46A  .... etc ?
> >>
> >> If so, are those addresses not accessible with EXamine / Deposit ?
> >>
> >> sim> ex 2013F468
> >> Address space exceeded
> >>
> >> Only from an instruction ?  :
> >>
> >> e.g.
> >>
> >> MOVW R0,2013F468
> >>
> >> sh rq
> >> RQ    address=2013F468-2013F46B, vector=1FC*, BR5, UDA50, 4 units
> >> .....
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> >>
> >
> >
> 
> 
> --
> Johnny Billquist                  || "I'm on a bus
>                                    ||  on a psychedelic trip
> email: bqt at softjar.se             ||  Reading murder books
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