We can't use delay loop to loop the 0.15 sec for 100 times to 15 sec because this game is still showing the equation on the screen, and at that moment, if 8051 uses delay loop to loop 0.15 sec for 100 times, it's quite non-sensible.

The reason is that the game is still in progress, the CPU can't do many things together and the other reason is that we can't just stop there to loop then the player will not know what's it happening.

So please help! Thank you.

Note: I must use assembly language.