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GAME: Optimize this! (z80 assembly)

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Halifax:
Basically everything can be optimized about this code. Post your optimized code with timings and bytes and we will see who has the most optimized code in the end!

c1-->CODE ec1


   xor a
   ld hl,0
   ld d,e
   ld l,h
mainloop:
   ld a,$FF
   out (1),a
   ld a,$FE
   out (1),a
   nop
   nop
   in a,(1)

   cp '1'
   call z,is_1
   cp '2'
   call z,is_2
   cp '3'
   call z,is_3
   cp '4'
   call z,is_4
   cp '5'
   call z,is_5
   cp 0
   jp z,mainloop
   jp mainloop

is_1:
   ld de,no_label1
   ld b,5
   call convert_num
   ret
is_2:
   ld de,no_label2
   ld b,5
   call convert_num
   ret
is_3:
   ld de,no_label3
   ld b,5
   call convert_num
   ret
is_4:
   ld de,no_label4
   ld b,5
   call convert_num
   ret
is_5:
   ld de,no_label5   
   ld b,5
   call convert_num
   ret




convert_num:
   ld hl,0
conv_loop:
   ld a,(de)
   inc de
   cp '1'
   ccf
   adc hl,hl
   djnz conv_loop
   ret
c2ec2

DJ Omnimaga:
let's hope CoBB from MC won't find this topic because he's instant winner by default then O_O

Halifax:
These optimizations are all easily findable, whether it is something I have said before, or something recently posted on MaxCoderz.

DJ Omnimaga:
ok, now if i knew assembly. I hope an assembly coder like iambian or jon passes by

JonimusPrime:
I fail at asm but even I can find Optimizations in that (too bad I'm too lazy to go through and type them).

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