My guess is that Anil is referring to Paul Edwards' PDOS [0].

[0] http://pdos.sourceforge.net/

On Mon, Sep 15, 2014 at 2:40 PM, Rugxulo <[email protected]> wrote:
> Hi,
>
> On Mon, Sep 15, 2014 at 1:30 AM, Anil Nair <[email protected]> wrote:
>>
>> We were working on PDOS development particularly interrupt number Int
>> 21/AH=0Eh(Select Default Drive). While testing the PDOS function i came
>> across a particular behaviour in FreeDOS
>>
>> "Return: AL = number of potentially valid drive letters".
>>
>> When tested using a function PDOS returns,
>>
>> The return value is x 4 x
>>
>> While testing the same behaviour in FreeDOS,
>>
>> The return value is x 5 x
>>
>> Is this expected? Please let me know if anybody needs more details.
>
> Which PDOS version? Where is such a thing (esp. bootable image)
> available for download, for comparison?
> Which FreeDOS kernel? And, as already mentioned, what does MS-DOS
> report? What are the contents of your bootup config files? What type
> of cpu was this tested on? Native or emulation? Where's the source
> code and/or binary showing what you're testing here? (It may seem
> redundant but can make things simpler to reproduce.)
>
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