|The maximum resoution on that is 640 x 480:|
As long as it's set that way in display properties and the refresh rate is between 50 and 70 Hz it should work OK, although that doesn't prevent someone from changing those figures.
What you can do is set the monitor to a standard VGA of 640 x 480. Open 'display properties'.
click 'display a list of all the drivers. . .'
click 'show all hardware'
Scroll up to 'standard monitor types' in the left panel and highlight it. In the right panel choose 'Standard VGA 640x480'. Then 'next'. Follow any remaining prompts to establish that as your monitor type. Once that's changed then only the 640 x 480 resolution should show in display properties.
Or any of the monitor types listed there with the same specs should work too. But of course that information isn't shown there.. The only one I know for sure is the same is the IBM 8513.