Symbol: MOUSE_PS2PLUS_ZNEG
sys/dev/atkbdc/psm.c
3207
*z = (pb->ipacket[2] & MOUSE_PS2PLUS_ZNEG) ?
usr.sbin/moused/msconvd/msconvd.c
1676
act->dz = (pBuf[2] & MOUSE_PS2PLUS_ZNEG)