[Info-vax] Hobbyist licences for VAX

[David Wade]

On 14/04/2022 23:00, gah4 wrote:
> On Thursday, April 14, 2022 at 6:38:13 AM UTC-7, Bob Eager wrote:
>> On Thu, 14 Apr 2022 01:07:56 -0700, gah4 wrote:
> 
> (snip)
>>> And, in case you were wondering, there is a difference in the IBM and
>>> Hercules form when using the track overflow feature, which as far as I
>>> know only applies to the 2314 and 3330. That allows a block to start
>>> on one track and continue onto the next track.
> 
>> Hmm. Might have to do my own. The track overflow feature is something I
>> *have* to implement.
> 
> They do implement it, but IBM and Hercules implement it in a different way.
> I think it is only one bit somewhere that is in a different place.

I don't believe there is any difference EXCEPT Hercules supports 
compressed images and also shadow files. Certainly files from my P390 
work under Hercules.

> 
> Early in the Hercules years, there was interest in running the freely available
> (before software copyright existed) MVS 3.8j.  It seems that IBM uses
> track overflow for the paging file, so it has to work!
> 

It looks like there some connects in the Hercules source about track 
overflow so it certainly supports it now

Dave