Added emulation of the Intel 82335 chip for the Phoenix 386 clone;

Added the Samsung SPC-4200P;
Added the Chips & Technologies VGA 451;
Applied all mainline PCem commits;
Added Amstrad MegaPC 386DX model (exits per documentation that I have in German).

src/i82335.c

@@ -0,0 +1,56 @@
+/* Intel 82335 SX emulation, used by the Phoenix 386 clone. */
+
+#include <stdint.h>
+#include "ibm.h"
+
+typedef struct
+{
+	uint8_t reg_22;
+} i82335_t;
+
+i82335_t i82335;
+
+void i82335_write(uint16_t addr, uint8_t val, void *priv)
+{
+	int i = 0;
+
+	switch (addr)
+	{
+		case 0x22:
+			i82335_t.reg_22 = val | 0xd8;
+			if (val & 1)
+			{
+				for (i = 0; i < 8; i++)
+				{
+					mem_mapping_enable(&bios_mapping[i]);
+				}
+			}
+			else
+			{
+				for (i = 0; i < 8; i++)
+				{
+					mem_mapping_disable(&bios_mapping[i]);
+				}
+			}
+			break;
+		case 0x23:
+			if (val & 0x80)
+			{
+			        io_removehandler(0x0022, 0x0001, i82335_read, NULL, NULL, i82335_write, NULL, NULL, NULL);
+			}
+			break;
+	}
+}
+
+uint8_t i82335_read(uint16_t addr, void *priv)
+{
+}
+
+void i82335_init()
+{
+	memset(i82335_t, 0, sizeof(i82335_t));
+
+	i82335_t.reg_22 = 0xd9;
+
+        io_sethandler(0x0022, 0x0014, i82335_read, NULL, NULL, i82335_write, NULL, NULL, NULL);
+}