RT-11 DY install

[Jerry Weiss]

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    address=17777170-17777173, vector=264, BR5, 2 units
   RY0    512KB, not attached, write enabled
     double density
   RY1    512KB, not attached, write enabled
     double density

Note: Apparently the RY emulation won't load if more than 256K memory is 
specified as the DEC hardware did not support DMA in a 22bit box.   I'm 
entirely not sure why SIMH has to enforce this as its possible to work 
around (e.g. TSX+ supports buffering the IO). Anyone know how to 
override and load in SIMH?


Jerry