ASM for a TI-83+ calculator help!

[stettybet0]

I don't know if ASM is similar for any platform, but hopefully someone will know how to help. If it helps, the TI-83+ uses a Z80 processor (the same processor in a GameBoy)

I'm looking for a way to delay the program... I need something to display on the screen for about 1 second, then go away. So, I have this:

      'Stuff to display on screen
      ld bc,65535
loop:
      djnz loop
      jr done
      ret
done:
      ret

Basically, it subtracts 1 from 65535 over and over until it reaches 0. Then it ends the program. That is the best way I could think of to delay the program... however, it only delays it for a very, very short time... I have to stare really hard, and I can sometimes barely see my message flash on the screen... however, as I said earlier, I need it to last for about 1 second... any ideas on how could I do this?

thanks,
stettybet0