Porting programs from another graphics calculator with a z80, Isn't it just a matter of fitting everything to the screen, converting the ROM calls, and then adjust the direct input stuff? All the rest you could leave alone. Am I right or is there more too it? From ''~`` ( o o ) ____.oooO__(_)__Oooo.____ / Steven Conway \ [ ] [ Conway@ssc.net.au ] [ ( ) ] \__\ (____( )______________/ \_) ) / (_/