On 10/17/2018 07:19 PM, 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 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?
If it didn't it wouldn't be emulating real PDP-11 hardware. I have a number of RX02 systems and they do not work with more than 256K. bill
