Subject: Re: div by 10 on Z80

[Jim Battle]

Jim Battle wrote:
> dwight elvey wrote:
...
>> Based on an email I just had from the cpm news group, I thought
>> it might be fun to write some Z80 code to do the 0 to 799 as fast
>> as one could, with no size restriction. Just clocks count.
> 
> There is a trivial solution: a look up table.
> 
>     add hl,hl    ; double it
>     ld  de,table    ; base addr of table
>     add hl,de       ; index
>     ld  a,(hl)      ; pick up quotient
> ...
> table    db  0,0        ; 0: quotient, remainder
>     db  0,1        ; 1
>     db  0,2
>     db  0,3
> etc

oops, I accidentally deleted the tail end of my program during editing.  add

	inc hl
	ld  h,(hl)

after the last instruction above to fetch the remainder