On 8/8/09, Mark Davidson <mdavidson1963 at gmail.com> wrote: Seeing as you have those particular machines, you might want to look into finding a Teac FD55GFR 5.25" floppy drive and attaching it to an Intel box old enough to handle it. There are a number of RX50 disk images floating around, with PO/S for the Pro/350 and various items for the DECmate at least. Besides PO/S (a degenerate menu-driven variant of RSX-11), you _can_ run RT-11 on the Pro/350, but licensing could be a problem, and there's 2.9BSD as another option, but you probably would have a better experience sticking with DEC OSes on that box. In case you don't already know, it's an F-11-based PDP-11, the same CPU chip as the PDP-11/23 and PDP-11/24, but with a completely wacky peripheral bus. The DECmate III is much like a DECmate II with fewer expansion options (smaller case, etc). ISTR the III was sold as floppy-only, but I'm not sure if there was a way to install an RD31 or not in there. It has either an Intersil or Harris IM6120 or H6120 12-bit CPU chip and a full 32Kwords of RAM, and can run either WPS-8 or OS/278. It can't run OS/8 because of very slight differences in how console I/O works. Both machines will work with a VR201 monitor and an LK201 keyboard. The Pro350 might work with a VR241 color monitor, but I don't remember if you need a different video card or a graphics addon or just a VR241 and cable. All the Pro350s I've seen were mono, but I _think_ color was possible. These were older machines, repackaged for the Nth time, with fewer expansion options than their predecessors, but in their hearts beat a real PDP-11 or real PDP-8 under all the 80s beige plastic. -ethan