Re: detecting ProDOS vs. Dos3.3

[Rubywand <rubywand@my-deja.com>]

Dennis Jenkins <dennis@usb.com> writes ...

> Hello,
> I am writing some code that needs to know which OS it is running
> under.  I'd prefer a "rock solid" way of doing this.
> Currently, I just examine the jump table target address
> on the $3d0 JMP.  If it is "BE00"
> I assume prodos and if it is (I forgot) then
> I assume Dos 3.3, anything else is an error.
> Is this a good method?  What about all of the Dos 3.3
> hacks out there...
>
 ....

     It's a pretty good check. 4C 00 BE seems to be a good indicator for
ProDOS. Meanwhile, DOS 3.3 and popular variants like Prontodos, EsDOS,
and DavidDOS all have 4C BF 9D at $03D0.

     There is a chance that your application could be launched under DOS
3.3 which has been moved to 'Language Card' RAM. The DOS-->LC mover in
our collection places 4C AE BF in $03D0.



Rubywand


Sent via Deja.com
http://www.deja.com/