First post, by bradr
Hey All,
(Not sure if this is the right place to post this but seemed the best choice...)
I'm working on a simple DOS emulator with the goal to run "Oh No! More Lemmings" for DOS as well as possible on modern Windows. What I've noticed however is that the timing seems off - both in my emulator and in DOSBox and I'm curious if the same thing happens on a real machine.
Here's what I'm finding...
1. start the game,
2. choose VGA and "High-Performance PC",
3. load the first level,
4. start a stopwatch
5. let the in-game timer count down from 4:00 to 0:00.
I'm finding that it actually takes about 4:52 instead of 4 minutes. ie one minute game time actually takes about 73 seconds real time.
I'm pretty sure it's correct because I've even looked at the game's code and it's counting 85 vertical retrace signals as one second but the video mode runs at 70hz. 60 seconds * 85 / 70 = approx 73 seconds.
But... I want to be sure and since I don't have easy access to a real machine from the era I'm wondering if someone wouldn't mind running the same test for me to confirm this timing is correct.
Brad