Rewrote the VLSI 82C480 chipset emuluation and gave the PS/1 Model 2133 its Super I/O chip.

src/machine/m_ps1.c

@@ -558,6 +558,7 @@ machine_ps1_m2121_init(const machine_t *model)
     return ret;
 }
 
+
 int
 machine_ps1_m2133_init(const machine_t *model)
 {
@@ -573,6 +574,7 @@ machine_ps1_m2133_init(const machine_t *model)
     device_add(&fdc_at_device);
     device_add(&ide_isa_device);
     device_add(&vl82c480_device);
+    device_add(&ps1_m2133_sio);
 
     nmi_mask = 0x80;
 
@@ -582,6 +584,7 @@ machine_ps1_m2133_init(const machine_t *model)
     return ret;
 }
 
+
 const device_t *
 ps1_m2133_get_device(void)
 {