[A83] Re: number _vputs and black-out a piece of screen
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[A83] Re: number _vputs and black-out a piece of screen
> > > How can I output a number stored in a with _vputs?
> > > It has to be a small font.
> > >
> > > ld a,(8008h) ;the place in RAM for the contrast
> >
> > Since your dealing with the contrast here, it might be better to just
> > display a number from 0 to 9, so just divide the byte in 8008h by 4 and
add
> > 30h to it, then put it in a string and display it.
>
> IMHO, It would be nice to display the quarters of a level to.
> Updated code:
>
>
> this should display something like:
> Contrast is 5 2/4
>
> NOTE:
> This could undoubdetly be don more efficient with a bitmask, but I've
> already written this code :-)
Undoubtedly :-)
So, updated again:
ld b,00h
ld a,(8008h)
rra ; divide by 2
rl b
rra ; once again
rl b
and 0Fh ; not sure if this is necessary, but I think it is.
add 30h ; 30h is the character '0'
ld (contrast),a
ld a,b
xor 3
ld (contrast_sublev),a
ld hl,contrastTxt
bcall(_vputs)
ret
contrastTxt:
.db "Contrast is "
contrast:
.db 0," "
contrast_sublev:
.db 0,"/4",0
Tijl Coosemans
References: