z80 math

catmeows

Most likely you know old good http://baze.au.com/misc/z80bits.html .

Moment ago i accidentally find this page : http://www.andreadrian.de/oldcpu/Z80_number_cruncher.html

Looks like interesting reading.

Battle Bunny

Here's another couple of handy pages:
http://map.grauw.nl/articles/fast_loops.php
http://map.grauw.nl/articles/mult_div_shifts.php

catmeows

Good links :) Have to point right shift multiplication. Really smart.

Im playing with idea of small 16-bit floating point library, 3 digit precission, 6 bit exponent and size well under 400 bytes. Should be faster than ROM calculator, allowing simple manipulation with numbers through 16-bit instructions ( LD RR, xxxx , LD RR, [xxxx], PUSH RR, POP RR ) and precision would be bearable, roughly of slide rule.