[Coco] Nitros9 technical question....

[Bill Nobel]

Hi Phil, the OS will handle the fact that more than one process can access a specific file. When you bring in the fact of switching a disk image the currently running programs will not know this. This of course could lead to issues.  Nitros9 was not built to handle a disk swap between programs running.  Though it can handle multiple disk access on  the same disk.

Sent from my iPhone

> On Nov 11, 2019, at 7:11 AM, Robert Gault <robert.gault at att.net> wrote:
> 
> Phil,
> 
> This list ought to be as good as anything else but you can try:
> https://sourceforge.net/projects/nitros9/
> Look at the Support and Discussion panels.
> 
> Regards your specific question, you could study the current NitrOS-9 disk I/O code as it also needs to deal with simultaneous disk access when more than one program is running. I assume that the disk code should ask the system for permission to access a disk and/or the system should keep track of the number of current requests for disk access.
> Either disk or system code would, in your case, then keep track of the A/O AVR values and prevent cross routing.
> 
> Robert
> 
> Phill Harvey-Smith wrote:
>> Hi all,
>> 
>> Is there still a Nitros mailing list that might be a more appropriate place for this?
>> 
>> Anyway I have a mostly working boot & disk driver for the DragonMMC interface, which can boot and
>> access any mounted disk images. What I want to do is to convert the ROM utilities that allow you to
>> list the contents of the SD card, and mount / unmount images to command line utilities for Nitros.
>> 
>> The DragonMMC works by having the FAT & SD reading part of the system handled by and AVR
>> microcontroller, the 6809 side of things uses a set of I/O locations to exchange data with the AVR.
>> This works for the disk driver code, and would be able to work for the utility code, however being a
>> multi-tasking OS I need to ensure the utilities don't interfere with disk I/O that may be going on
>> in the background.
>> 
>> Does anyone have any suggestions as to the correct way to do this?
>> 
>> Cheers.
>> 
>> Phill.
>> 
> 
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