[Simh] porting RL01 images to RL02

[Johnny Billquist]

On 2017-02-06 00:25, Paul Koning wrote:
>
>> On Feb 5, 2017, at 3:31 PM, Mark Pizzolato <Mark at infocomm.com> wrote:
>>
>> On Sunday, February 5, 2017 at 11:07 AM, Johnny Billquist wrote:
>>> ...
>>
>> A concept related to this discussion is simh's auto sizing of disks.  In the PDP11 and
>> VAX simulators the RQ and RP disks use the sim_disk library to perform I/O to disk
>> Images and/or physical disk devices.
>>
>> A relatively new feature that this code performs is that it make an attempt to peek
>> into the image file being attached and determine the size of the file system that
>> is in the container file.  Currently there is support for detecting the size of ODS2/5
>> file systems and Ultrix partition tables.
>>
>> ...
>>
>> So, I'd like to expand the set of file system types that the auto sizing logic can perform
>> to include RSTS disks and whatever might be commonly used with RSX and RT11.
>
> Yes, that would be neat.  I'm hoping to get to get to that sometime soon.  It's clearly doable for RSTS.  Not as simple as for ODS because it has to look up a file (the free space bitmap).

Well, you do need to do a file lookup in ODS as well.
Maybe the complexity is similar. Although file lookups in ODS in this 
case is rather simple. I don't know how that looks under RSTS/E. Maybe 
it is more complicated?

	Johnny

-- 
Johnny Billquist                  || "I'm on a bus
                                   ||  on a psychedelic trip
email: bqt at softjar.se             ||  Reading murder books
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