Signature of ATT 6300 graphics

[Robert Seals]

Yo,
    I'm using Turbo C 1.5 to write some purportedly portable (!?)
programs that include some graphics. My version of TC does not
autodetect a PC6300Plus adapter/screen as being a 6300, but a cga, even
though it does support drawing in 6300 mode when initialized
explicitly as being 6300.

    Zo, does anyone know what kind of signature to look for to try
to identify an ATT as being ATT?

    Murky buckets, etc.

rob
Robert Seals @ ASRC
rds95 at leah.albany.edu or
rob at asrcmv.albany.edu