Going by the size of the disk image files, I believe there’s a mix. These are downloaded disk images I pulled (literally) years ago, DL0 seems to be RL01, while DL1 is RL02:
5235200 Dec 21 2011 rt11dat.dsk 5235200 Feb 12 12:18 rt11run.dsk 10475520 May 10 2006 rtv53_rl.dsk The one I’m trying to initialize is rt11dat.dsk, it’s “empty”. The other two read/access just fine, but I’ve never tried to initialize them Startup cmd file is: SET CPU 1M ATTACH RL0 rt11run.dsk ATTACH RL1 rtv53_rl.dsk ATTACH RL2 rt11dat.dsk SET RL2 BADBLOCK BOOT RL0 I think that “BADBLOCK” option came from some suggestion way back, like I said, it’s been a long time since I touched this. From: Simh <simh-boun...@trailing-edge.com> On Behalf Of Henk Gooijen Sent: Wednesday, February 12, 2020 2:27 PM To: simh@trailing-edge.com Subject: Re: [Simh] Initializing disks (triggered by the "Something Strange with RK05" chain See below … Van: Ken Hall <mailto:kjhal...@gmail.com> Verzonden: woensdag 12 februari 2020 18:30 Aan: simh@trailing-edge.com <mailto:simh@trailing-edge.com> Onderwerp: [Simh] Initializing disks (triggered by the "Something Strange with RK05" chain I’ve played with RT11 on and off over the years, but the one thing I’ve never been able to do is properly initialize an empty disk. If I create a DL2: for example, and try to run initialize on it, I get back: .dir dl2: ?DIR-F-Error reading directory .init dl2: DL2:/Initialize; Are you sure? YES ?DUP-F-Size function failed This seems similar to the issues Henk Gooijen has been having with RK05’s, and it’s been so long since I’ve dealt with the real hardware I don’t recall exactly how this is supposed to work, but it seems to me it should just “work”. Has anyone found a solution to this? I can check that tomorrow. Maybe that is the reason you can download an empty but initialized RL02 image (zipped) from DBIT. If RT11 cannot figure out the size (5 MB or 10 MB / RL01 or RL02), maybe the command (in SIMH) .SET RL0 RL02 helps. You specify that RL0 is an RL02. Likewise, you can say .SET RL0 RL01. On a real PDP-11 with RL drives the system will recognize what type RL01 or RL02 is connected/loaded. You can have a mix of RL01 and RL02 drives on one RL11 controller. The .SET RLx RL01 (or RL02) command is not of RT11, but of SIMH. Give it a try 😊 For the write protect command for the RK drives, this is probably also a SIMH command. .SET RK0 WRITEENABLE *is* in SIMH (as is .SET RK0 LOCKED).
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