it works for me Reference: /n/sources/patch/applied/ide5513 Date: Wed Nov 3 14:10:55 CET 2004 --- /sys/src/9/pc/sdata.c Wed Nov 3 14:10:56 2004 +++ /sys/src/9/pc/sdata.c Wed Nov 3 14:10:55 2004 @@ -1903,6 +1903,7 @@ * address for the registers (0x50?). */ break; + case (0x5513<<16)|0x1039: /* SiS 962 */ case (0x0646<<16)|0x1095: /* CMD 646 */ case (0x0571<<16)|0x1106: /* VIA 82C686 */ case (0x0211<<16)|0x1166: /* ServerWorks IB6566 */