🚀 go-pugleaf

Hi-
I have a PDP-11/34 (Unibus) and recently acquired an RK07 on a RK611 ctrl.
Whenever I try to access the disk for read or write, the red FAULT light
and the A drive access light light up, and it won't do anything else.
I have some disk packs which are straight from DEC, never used, and a couple
whick had been formatted on a VAX11/750 with a different RK07 drive. It
does the same thing whichever packs I use. The LEDs inside the
drive indicate only that speed is ok and unit is selected. It spins up
and down o.k. and the ready light comes on after an appropriate amount
of time. I have a feeling that it has to do with the packs' never having
been formatted, or formatted with the wrong number of bits (18 vs. 22, I
think?) but this is only a hunch. Do these things need to be formatted?
The unibus interface seems to be working all right- all the registers
give me credible values, and the error register sometimes says that
there is an incorrect number of bits. All my other software runs o.k. as
long as it doesn't try to access the RK07. I have no diagnostics for it
because the ones I have came out before the RK07 did. Many thanks to all
who respond; the net has been a great source of help on this pet project
in the past.


                                    Eric Volpe 
                                    Choate Rosemary Hall School
                                    Wallingford, CT
                                    (...decvax!yale!spock!eric)
                                    (or choate@yalecs.ARPA)