VMS EXCHANGE format for VAX console media

Johnny Billquist bqt at update.uu.se
Fri Jun 5 21:12:39 CDT 2015

On 2015-06-06 04:08, Mark J. Blair wrote:
>> On Jun 5, 2015, at 19:05 , Johnny Billquist <bqt at update.uu.se> wrote:
>> See if you can spot the RT-11 file system in there.
> Aha, is the console tape supposed to be in RT-11 format? That's something I can look for. My home-grown RT-11 filesystem finagling utility barfed on my "suspected good" raw image, but that could very well be a bug in my own code. I'll dig in with a hex editor tonight and look for the filesystem header blocks.

I definitely know that this is the case for the VAX-11/78x and VAX-86x0 
machines. And you use EXCHANGE to access the files.
I haven't properly looked at the 11/750, 11/730 or 11/725, but I don't 
think EXCHANGE understands anything else but the RT-11 filesystem. As 
far as I know, that was EXCHANGE existed for. It might be able to read 
DOS-11 tapes as well. (If we talk about pure 1/2" magtape.)


Johnny Billquist                  || "I'm on a bus
                                   ||  on a psychedelic trip
email: bqt at softjar.se             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol

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