It comes from the fact that that's the FPS that would be used if you were running on an actual old DOS computer.

Thanks for the reply, HunterZ.

By the way, if I set timesynched=false I get a big performance hit and the sound becomes choppy:

Do you know why? Why is the timesynched mode so fast?

Thanks.
Cheers.

it's not fast.
if you disable it you should lower your cycles. It's an alternative timing method.

Hi,

Now you've totally lost me.

When I set timesynched=true, I can get close to 60000 cycles and still run smoothly with correct music and sound.

However, if I set timesynched=false, I get choppy sound and slow gameplay even with 50000 cycles. I have to lower them to 35000 aprox. to play the game smoothly again.

Why can I get almost 60000 cycles with timesynched=true?

Are the cycles reported in one mode directly comparable to the cycles reported in the other mode?

Thank you.
Regards.

In non-timesynched mode, both cycles numbers should be roughly the same (that's why the = character). If one number is significantly lower then the other, the number of cycles you have set is too high for your computer, the FPS drops, sound becomes choppy...
In timesynched mode, the number of cycles represents an estimate how much cycles you should set to run in non-timesynced mode. Timesynched mode should not be faster, it's usualy the otherway around 😀. In non-timesynched mode it usually possible to get an extra 1000 cycles or so...

unless the game uses a very odd system in a way that the cycles are one turn enough and the other too little.

Roger, I understand it clearly now.

Thank you Qbix and Gulikoza.

Regards.

To answer the original question, the 70 FPS number comes from the VGA adapter, which ran all but two standard resolutions at 70Hz. Earlier adapters generally ran at 60Hz.

Also, to add to what others commented on about your number of cycles: Depending on the game, I usually don't go much higher than 30000 with dynamic core and without the timesync patch, so your values of 50000 to 90000 are quite high.

Also, you have to realize that if you turn off timesync, you have to manually lower your cycles to a level that your system can handle. It's kind of like the difference between manual and automatic transmissions in cars 😀