Can someone show me a program that will count 1~1000 really fast?
i tried like this, but it wont work.
Start:
Bcall ClrScrnFull
Bcall HomeUp
Count:
ld hl,(number)
ld de,(check)
or a
push hl
sbc hl,de
ret z
pop hl
inc hl
bcall dispHL
ld (num),hl
jp count
number:
db 0
check:
db 1000
 
And the mimas gives me an "out of range" error when i try to compile. and i changed the db to dw, and it worked, but it wont count.
Please detailed explanation
Edit: oh yea i just noticed that when i use sbc, it will make hl equal to negative.. i dont know how to fix that.

 
it gives me error that LD HL,BC is invalid.
i think i should try like this:
LD H,C
LD L,B

bcall(_dispHL) destroys HL. So store HL back into (num) before you call it. For the most part, you should usually assume that a bcall will destroy all your registers.

push hl
sbc hl,de
ret z
pop hl
This could be disastrous!  If you return after you pushed hl, the top of the stack contains the number hl instead of the return address so the program will jump to some random place in memory.  You should only return after the stack is back to where it was before:

push hl
sbc hl,de
pop hl
ret z