ASM for a TI-83+ calculator help!

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:

Code:

---

      '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

Code:

---

      'Stuff to display on screen
      ld bc,0 ;this gives you 1 more loop than 65535
loop:
      ld hl, 0 ;adjust this for 1 second
loop1:
    ;I forgot my Z80, but decrement hl and jnz loop1
      djnz loop
      ;jr done ;this isn't needed
      ;ret ;this never gets executed
done:
      ret

---

This will give you a maximum of 65536 times your original loop time - probably a lot longer than you want, so adjust hl to make it as long as you want.

That is going to completely thrash the CPU and waste your batteries though. You'd be better off using ticker interrupts.