PDP-11/23+ and rx-02 drives, need help!!!

[Ethan Dicks]

On 7/6/05, Tony Duell <ard at p850ug1.demon.co.uk> wrote:
> > The system is a Micro PDP 11,  8 slot Rack mount, with
> > 1  M8189 1123+
> > 1  M8067 KB  256k Memory
> > 1 M8639 YA  MFM rx50 controller
> > 1 M8029 RX-02 controller in this order.
> 
> I'm not a 'Qbus person', much prefering Unibus machines, but IIRC one of
> the ST506/RX50 controllers (RQDX1 I think) had to be the last device on
> the bus since it didn't pass on grants. If that's the controller you
> have, then the RXV21 would mever get BGs or NPGs and woul;d probably do
> what you're seeing. Try putting the RXV21 first...

Especially since the boot ROMs pull the boot sector off the floppy
without interrupts. You should see some activity, hear heads,
something, but no OS prompt.  You could always check the contents of
low memory to see if the boot routine was able to pull the first
sector off the diskette.

In any case, you can't put the RVX21 behind the RQDX1.

-ethan