Give us more info...
What are you feeding the signal to the Toshiba TV with? ArcadeVGA? Other?
What type of connection are you using? S-video, component, composite?
Is the Black & White and the scrolling occuring in DOS, Windows or both?
What OS are you using? Win ME, Win 98, Win2k, WinXp?
What front-end are you using?
A bit more info and we can make a better judgement/suggestion.

Take care...
Scott