Overhauled the SiS 496/497 chipset emulation (and added the DRB locking to it) (later Zida Tomato 4DPS BIOS'es now work, and we now use the actual 1.72), fixed the W83787F and FDC37C932FR Super I/O chips, removed the no longer needed Acer M3A registers (that's now correctly handled as FDC37C932FR GPIO), and a number of bugfixes here and there.

src/machine/m_ps1.c

@@ -495,7 +495,7 @@ ps1_setup(int model)
     /* Enable the PS/1 VGA controller. */
     if (model == 2011)
 	device_add(&ps1vga_device);
-    else
+    else if (model == 2021)
 	device_add(&ibm_ps1_2121_device);
 }