Date   : Wed, 27 Jul 1988 16:12:50 GMT
From   : necntc!ima!cfisun!lakart!dg@ames.arc.nasa.gov (David Goodenough)
Subject: Need help with brain-damaged bdos.

From article <9936@e.ms.uky.edu>, by simon@ms.uky.edu (George Simon):
> Help!!!
>   The version of cpm that it is running seems to be < 2.2, and 
>   the bdos seem to be brain-damaged.
>
>   (2) Bdos function 6 (direct console i/o) does not exist, but 
>           the corresponding bios calls work ok.  Other bdos calls 
>           may be ok, but I trust the bios much more.  The bdos also
                                                           ^^^^^^^^^^^^^
>           refuses to return the version#.
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

This may be part of your problem: function 12 (0xc) in V2.0 and higher
gives back the version number - V1.X does not: it appears that you have
a very early version. To verify this try some tests of the random access
routines: if they fail you almost certainly have a pre 2.0 bdos.
       
>   Anyone got any other ideas?  I'd love to be able to do double-density,
>   but I don't know if the WD1771 can do this.  I have heard that 

Sadly the 1771 only talks single density, and I don't know if the 1791 /
1793 would be a dropin replacement.
-- 
       dg@lakart.UUCP - David Goodenough               +---+
                                                       | +-+-+
       ....... !harvard!cca!lakart!dg                  +-+-+ |
                                                         +---+


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