DEC Pro hard drive formatter

Paul Koning paulkoning at
Sat Jan 16 16:17:06 CST 2021

I just tried what you suggested (with P/OS 3.0) on an MFM emulator empty RD52 image, and indeed that works just fine.

Thanks Chris!


> On Jan 14, 2021, at 1:25 PM, Chris Zach via cctalk <cctalk at> wrote:
> Hm. I remember that POS 2.0 and above would just format the hard disk and go during the install. Likewise I don't know if you can have multiple hard disks in P/OS so that's a pain in the tail.
> Boot from floppies and just init the raw disk.
> C
> On 1/14/2021 11:39 AM, Paul Koning via cctalk wrote:
>> I'm wondering how to do hard drive formatting, which is likely to be needed when working with emulated disks in David Gesswein's MFM emulator.
>> As far as I can tell, RT-11 can do this.  At least I have a source code printout for such a formatter.  But while I can find a hard drive image of RT V5 for Pro, I haven't found any floppy-bootable images.  And I think it's a bit tricky to create one.  I knew, long ago for V2...
>> Any suggestions?  Any alternative sources for a formatter?  I guess I really should consider typing in the core of that formatter and adding it to RSTS.
>> 	paul

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