On 06/05/2019 23:38, John Forecast via cctalk wrote: Not only was the RX33 not supported until 5.04, there's a bug in the MSCP DU driver that wasn't fixed until 5.03 (IIRC) or maybe 5.04, which means nothing on an RQDX3 can be guaranteed to work properly before that. It caused me a lot of grief, way back in 1994. See the files at http://www.dunnington.info/public/RQDX/ and particularly http://www.dunnington.info/public/RQDX/DUX.TXT if you're interested. -- Pete Pete Turnbull ========================================================================= thanks for the additional info. Will check out the links. Meanwhile, I found an RK05 image of RT-11 "5.4" on bitsavers, made an RL02 bootable -SJ image on SIMH, then copied it over to the hardware with VTserver. (I didn't have to wait for the entire 10 MB since the contents were all on the first 3 MB anyway and no bad blocks). The system booted up to a 5.04 prompt and DU0: is fully usable with 2382 blocks on a 3.5" diskette :) My TSX+ 6.50 copy also didn't have DU enabled in TSGEN.MAC so I had to uncomment that DEVDEF line and reassemble/relink. It's SLOW on my 11/23+... we're spoiled with GHz PC's and GB of RAM. Now I can use the floppy under TSX+ too. But the generic 3.5" drive in my WinXP box can't successfully emulate an 3.5" RX33 with PUTR, apparently. (Nor an RX23). I only get read/write/directory errors after several seconds of head activity even with /RX33 and /RT11 switches set. Time for more reading and maybe drive swapping/tweaking...