Index: boot/freeldr/freeldr/freeldr.c
===================================================================
--- boot/freeldr/freeldr/freeldr.c	(revision 56647)
+++ boot/freeldr/freeldr/freeldr.c	(working copy)
@@ -52,6 +52,9 @@
 #ifdef _M_IX86
 	HalpInitializePciStubs();
 	HalpInitBusHandler();
+
+	/* check if we're running on a 486. */
+	FrCheck486Compatiblity();
 #endif
 	RunLoader();
 }
Index: boot/freeldr/freeldr/arch/i386/hardware.c
===================================================================
--- boot/freeldr/freeldr/arch/i386/hardware.c	(revision 56647)
+++ boot/freeldr/freeldr/arch/i386/hardware.c	(working copy)
@@ -1755,4 +1755,56 @@
    */
 }
 
+VOID
+FrCheck486Compatiblity(VOID) {
+  INT CpuInformation[4] = {-1};
+  ULONG NumberOfIds;
+
+  /*
+   * Note: the use of printf(x) in this function is used
+   * due to the User Interface not being initialized.
+   */
+
+  /* Check if the processor first supports ID 1 */
+  __cpuid(CpuInformation, 0);
+
+  NumberOfIds = CpuInformation[0];
+
+  /*
+   * Nids will be greater than 1 if the running processor is 
+   * new enough.
+   */
+
+  if(NumberOfIds <= 1)
+    {
+    INT ProcessorFamily;
+
+    /* Get information. */
+    __cpuid(CpuInformation, 1);
+
+    ProcessorFamily = (CpuInformation[0] >> 8) & 0xF;
+
+    /* If it's Family 4 or lower, spin. */
+
+    if(ProcessorFamily < 5)
+      {
+        printf("ReactOS requires a Pentium-level processor or newer.\n\n");
+
+        printf("System halted.\n");
+	while(1);
+      }
+    }
+  else if(NumberOfIds == 0)
+    {
+      printf("ReactOS requires the CPUID instruction to return "
+             "more than one supported ID.\n\n");
+
+      printf("System halted.\n");
+      while(1);
+    }
+
+  return;
+}
+
+
 /* EOF */
Index: boot/freeldr/freeldr/include/arch/i386/i386.h
===================================================================
--- boot/freeldr/freeldr/include/arch/i386/i386.h	(revision 56647)
+++ boot/freeldr/freeldr/include/arch/i386/i386.h	(working copy)
@@ -69,4 +69,6 @@
 void i386AlignmentCheck(void);
 void i386MachineCheck(void);
 
+VOID FrCheck486Compatiblity(VOID);
+
 /* EOF */