Hello World. You will find, attached with this message , a short program, made in assembly language. It takes on the first stack level, a 256*256 GROB, and then draw Sierpinsky triangle in. It's quite fast (take approx 2.5s). If you need help, or just comment, please, email me -- I'm writing here for my own perspective not on behalf of HP - - - Jean-Yves Avenard Email: JEAN-YVES_AVENARD@hp-france-om10.om.hp.com Snail: 16 rue de Savigny-91390 Morsang sur Orge (France)