https://web.archive.org/web/20230304093529/https://www.ilande.co.uk/index.php?/archives/7-Migrating-an-NT4-VM-from-VMWare-to-NT4-Part-2.html

--------------------------------------------------------------------------------

** hw/ps2.c.orig       2008-05-29 17:25:53.000000000 +0100

--- hw/ps2.c    2008-05-29 17:31:14.000000000 +0100

**************

** 446,451 ****

--- 446,453 ----

              s->mouse_detect_state = 0;

              break;

          }

+       / Force mouse type as PS/2 to fix NT4 crazy mouse bug */

+       s->mouse_type = 0;

          ps2_queue(&s->common, AUX_ACK);

          s->common.write_cmd = -1;

          break;


--------------------------------------------------------------------------------

in newer qemu this goes here

    case AUX_SET_SAMPLE:
        s->mouse_sample_rate = val;
        /* detect IMPS/2 or IMEX */
        switch(s->mouse_detect_state) {
	}
	-> here