the physical disk supports two logical disks. Added a logical disk number
which returns 0 when there are no logical disks or the specific logical
disk number if they exist. Currently, only UniDosFormatDisk does this.
In the future, Pascal disk may support this and possibly ProDOS disks
that have sections set aside (ie, a Pascal partition) - if they exist in the
real world.
more information gets written to disk as part of the format process.
In particular, the &CAT command will crash as the catalog routine is
apparantly loaded in from disk (T1,S9 in DOS parlance) and then
executed.