Add a small partition, second drive etc, and boot into XP on it. Should be more reliable for older 16/32bit applications than W7/64 is, even though it does try hard in compatibility modes... it just can't 'do' 16 bit apps.
AFAIR the XP default driver could also 'fake' 640x480x256, even if it was an unsupported mode in the NVIDIA/Radeon driver.