hi pals,
 
i've found a bug in the decision for the biggest graphics. it came, that while the call for _gr_selectmode had found a highly impressive mode of 1280*1024*4 (4 is the default color number for vga/vesa), in the inherited drivers it would settle for a best of 320*200*4 mode, because this is the first mode to match the colors number. i've changed the line in _gr_selectmode
from
#       define ERROR(des,act)   ((des > act) ? ((des - act) + 20000) : (act - des))
to
#       define ERROR(des,act)   ((des >= act) ? ((des - act) + 20000) : (act - des))
and it apears no to settle for less. it will be better tested in an environment where the driver may find a better match in the inherited modes.
please test it further, if you know there is such environment.
 
nb: i'm asking for further testing, since it got late and i can't concentrate. but the algorithm is somewhat error prone.
 
best wishes,
alex