The original goes to 1024 x 786 and has different zoom levels. I've played most of the original parks this year and that does not see to be too high res to me. Give me a sec I'll take a screenshot of mine in a minute.

Edit here it is. It's the GOG version, which launches fullscreen, so the 1024 x 768 are stretched onto the center of my 1920 x 1080 screen.