Added the Acer A1G

An "integrated" style Acer 486 board. Uses the ALi M1429G chipset.

Also fixed some typo's on the Machine table.

src/video/vid_cl54xx.c

@@ -3369,6 +3369,33 @@ static const device_config_t gd5428_config[] =
         }
 };
 
+static const device_config_t gd5428_a1g_config[] =
+{
+        {
+                .name = "memory",
+                .description = "Onboard Video RAM size",
+                .type = CONFIG_SELECTION,
+                .selection =
+                {
+                        {
+                                .description = "1 MB",
+                                .value = 1
+                        },
+                        {
+                                .description = "2 MB",
+                                .value = 2
+                        },
+                        {
+                                .description = ""
+                        }
+                },
+                .default_int = 2
+        },
+        {
+                .type = -1
+        }
+};
+
 static const device_config_t gd5440_onboard_config[] =
 {
         {
@@ -3557,6 +3584,20 @@ const device_t gd5428_mca_device =
     NULL
 };
 
+const device_t gd5428_a1g_device =
+{
+    "Cirrus Logic CL-GD 5428 (Onboard)",
+    DEVICE_AT | DEVICE_ISA,
+    CIRRUS_ID_CLGD5428,
+    gd54xx_init, 
+    gd54xx_close, 
+    NULL,
+    gd5428_isa_available,
+    gd54xx_speed_changed,
+    gd54xx_force_redraw,
+    gd5428_a1g_config
+};
+
 const device_t gd5429_isa_device =
 {
     "Cirrus Logic CL-GD 5429 (ISA)",