ti 84 game programming help

[liunx]

<!--c1--><div class='codetop'>CODE</div><div class='codemain'><!--ec1--> <br />"/->str1<br />for(a,1,20<br />str1+"/->str1<br />end<br />str1->str2<br />for(a,2,9<br />str1+"/                   /->str1<br />end<br />str1+str2->str1<br />length(str1)-15->l<br />1->c<br />repeat a=0<br />getkey->a<br />for(b,1,8<br />output(b,1,sub(str1,c,16<br />c+(a=26)(a<l)-(a=24)(a>1)<br />end<br />end<br /><!--c2--></div><!--ec2--><br /><br /><br />can someone debug it??<br />i cant find it<br /><br />oh does someone knows a good tutorial for assembly for the ti 84
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