25 Jan
2008
25 Jan
'08
4:42 a.m.
Jim Battle wrote:
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
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