Added Xebec Support

Added Xebec support by porting code from SCSI2SD V5 firmware.   This code supports the First Class Peripherals Sider hard disk for Apple II

src/ZuluSCSI_disk.cpp

@@ -1947,6 +1947,19 @@ int scsiDiskCommand()
         commandHandled = scsiModeCommand();
         blockDev.state &= ~DISK_WP;
     }
+    else if (unlikely(command == 0xE0))
+    {
+        // RAM Diagnostic
+        // XEBEC S1410 controller
+        // http://bitsavers.informatik.uni-stuttgart.de/pdf/xebec/104524C_S1410Man_Aug83.pdf
+        // Stub, return success
+    }
+    else if (unlikely(command == 0xE4))
+    {
+        // Drive Diagnostic
+        // XEBEC S1410 controller
+        // Stub, return success
+    }       
     else
     {
         commandHandled = 0;

src/ZuluSCSI_log_trace.cpp

@@ -100,6 +100,8 @@ static const char *getCommandName(uint8_t cmd)
         case 0xA8: return "Read12";
         case 0xC0: return "OMTI-5204 DefineFlexibleDiskFormat";
         case 0xC2: return "OMTI-5204 AssignDiskParameters";
+        case 0xE0: return "RAM Diagnostic";
+        case 0xE4: return "Drive Diagnostic";    
         default:   return "Unknown";
     }
 }