By default the pci card only switches on the TFT screen.On the original drivers disk were some utilities to enable you to switch on the crt output as well (sm.com).The following exert from the users manual gives a brief description.Unfortunately I don't have a copy of the original disk.
If you want a copy of the user manual it can be downloaded here:
http://www.bunkermentality.net/k57manual.pdf"Analogue CRT Interface
The analogue CRT interface is the standard interface provided by all video
cards. It supports all standard VGA modes in addition to some extended
modes. By default, this interface is not activated. The interface can be
activated by running 'ct.com' or 'sm.com' provided on the K57 utilities disk.
Note: