@ Mallette,
Your GVP IV24 is a video switcher, frame buffer, effects display device that also has the added advantage of being able to be used as a "flicker fixer" in the A2000. I think there was a less produced (more rare) version for the A4000 that could work with the AGA display modes and color depth.
Do you also have the "break-out" box that works with it?