diff -r c850674a3101 -r b3c3d54d2c7c src/def_hp34970_fp.h
--- a/src/def_hp34970_fp.h	Sun Nov 01 22:16:33 2020 +0100
+++ b/src/def_hp34970_fp.h	Sun Nov 01 22:21:19 2020 +0100
@@ -33,11 +33,12 @@
 #define KP_C2 PC_0
 #define KP_C3 PB_4
 #define KP_C4 PB_0
-/*
+
 #if defined(HAVE_PC)
-#include <USBSerial.h>
-USBSerial pc;
+//#include <USBSerial.h>
+//USBSerial pc;
+BufferedSerial pc(PC_10_ALT0, PC_11_ALT0, 115200); // UART_4
+//BufferedSerial pc(PC_10, PC_11, 115200); // UART_4
 #endif
-*/
 
 #endif