I used DEC for years, from straight -8 and the11/45 at OMSI west lab, to Metheus BSD 4.1/4.2, Sys V and RT-11 to the 90's with microvax, Those were the days when it actually felt like you helping humanity, making life better. Not any more.
On Mon, Dec 22, 2025 at 7:43 AM Nadav Eiron via cctalk < [email protected]> wrote: > Nope. Those are different drives. Mine has 2 *physical* RK05 drive IDs > for each platter. Look at (PDF) pages 12-13 in this file: > > http://www.bitsavers.org/pdf/plessey/peripheral/Plessey_Minicomputer_Add-Ons_and_Peripherals_ca_1975.pdf > I believe you're describing the PM-DD/11B and I have the PM-DD/11C. I have > them on a PDP-11/45, so OS/8 isn't part of the equation :) > > Nadav > > On Mon, Dec 22, 2025 at 12:48 AM Christian Corti via cctalk < > [email protected]> wrote: > > > On Thu, 18 Dec 2025, Nadav Eiron wrote: > > > I have such a drive connected to an 11/45. It's branded as Plessey. The > > > drives are double density RK05 compatible (i.e., it's like an RK05F + a > > > "removable RK05F" with a specially marked removable pack that looks > > > > We have a couple of those, all branded as Plessey, but they are Wangco > > type F drives. They have one fixed and one removable platter. > > It is like two RK05, not RK05F. > > > > > physically like an RK05 pack) and present as 4 RK05 drives to the > > > controller - two on the fixed platter and two on the removable one. > > Haven't > > > > This would be on the PDP-8 / RK8E where each platter is divided into two > > parts because OS/8 can't handle as many blocks as one entire platter has. > > This makes your 4 logical drives, but it is still only like two RK05 > > drives. > > > > Christian > > >
