RT-11 DY install

[Don Stalkowski]

On Wed Oct 17 19:19:20 2018 cctalk at classiccmp.org (Jerry Weiss via cctalk) wrote:
> 
> On 10/17/18 1:53 PM, Don Stalkowski via cctalk wrote:
> > I'm trying to use a simulated RX02 disk (under simh) with RT-11
> > and can't seem to get the DY driver to install.
> >
> > Here's the relevant log:
> >
> > sim> set ry enabled
> > sim> att ry0 ry0.dsk
> > RY: creating new file
> > RY: buffering file in memory
> > sim> c
> >
> >
> > .install dy
> > ?KMON-F-Invalid device installation DL0:DY.SYS
> >
> > .dir dy.sys
> >
> > DY    .SYS     4P 20-Dec-85
> >   1 Files, 4 Blocks
> >   14841 Free blocks
> >
> > I've tried with 2 different software "kits", the one from the simh site
> > and the one from bitsavers.
> >
> > Any ideas?
> >
> > Thanks, Don
> >
> 
> Try
> set cpu 256K
> set rx disable
> set ry enable
> 
> show ry
> RY=C2=A0=C2=A0=C2=A0 address=3D17777170-17777173, vector=3D264, BR5, 2 un=
> its
>  =C2=A0 RY0=C2=A0=C2=A0=C2=A0 512KB, not attached, write enabled
>  =C2=A0=C2=A0=C2=A0 double density
>  =C2=A0 RY1=C2=A0=C2=A0=C2=A0 512KB, not attached, write enabled
>  =C2=A0=C2=A0=C2=A0 double density
> 
> Note: Apparently the RY emulation won't load if more than 256K memory is=20
> specified as the DEC hardware did not support DMA in a 22bit box.=C2=A0=C2=
> =A0 I'm=20
> entirely not sure why SIMH has to enforce this as its possible to work=20
> around (e.g. TSX+ supports buffering the IO). Anyone know how to=20
> override and load in SIMH?
> 
> 
> Jerry
> 
Thanks Jerry. That's "fixed" it. Since simh didn't complain about
my "set ry enabled" I assumed (wrongly) that that wasn't the issue.

Thanks to all the other's who replied.

Don