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realemu: fix pit bcd mode

--- a/sys/src/cmd/aux/realemu/pit.c

+++ b/sys/src/cmd/aux/realemu/pit.c

@@ -51,7 +51,7 @@

 		return;

 	w = ch->count & 0xFFFF;

 	if(ch->bcd)

-		w = (w % 10) + ((w/10) % 10)<<4 + ((w/100) % 10)<<8 + ((w/1000) % 10)<<12;

+		w = (w % 10) | ((w/10) % 10)<<4 | ((w/100) % 10)<<8 | ((w/1000) % 10)<<12;

 	ch->rlatch[0] = w & 0xFF;

 	ch->rlatch[1] = (w >> 8) & 0xFF;

 	ch->rcount = 0;