An update on this post. I scrounged around in my archive of computers and found a PCI video card (not as recent as i would have preferred)
It is an ATI RAGE 11 + 3D circa 1996. Has been installed in the Dell and has now given me the availability of adjustments to resolution parameters. Somewhat limited as this card was designed for use with Win 95/98. I can get 24 colours now (not 32) and i have the max resolution it will accept at 1028x780 or something like that. I tried to find drivers for it that would associate with win xp hoping i might get even more flexibility of choice. Went down many rabbit holes on that with no success. However the good news is that the streaming video and dvd video on a 26" LCD HD monitor is great from the computer.Would have liked to have been able to upgrade the on board video card's drivers but that did not work out. Thanks to all that provided their guidance,truenorth