IBM PS/2 model 60: Looks like the model 50 bios expects the 50 POS id, and given the 60 shares its stuff with 50, I believe the id is identical then.

src/machine/m_ps2_mca.c

@@ -1385,7 +1385,7 @@ machine_ps2_model_60_init(const machine_t *model)
 
     machine_ps2_common_init(model);
 
-    ps2.planar_id = 0xf7ff;
+    ps2.planar_id = 0xfbff;
     ps2_mca_board_model_50_init(8);
 
     return ret;