diff -r 897330ee6e9d -r d9c5eaf85fab src/def_hp34970_fp.h
--- a/src/def_hp34970_fp.h	Sun Oct 03 22:58:49 2021 +0200
+++ b/src/def_hp34970_fp.h	Mon Oct 04 21:14:39 2021 +0200
@@ -35,14 +35,8 @@
 #define KP_C4 PB_0
 
 #if defined(HAVE_PC)
-
 #include <USBSerial.h>
-#if 1
 USBSerial pc(false);  // PA_11 USB_DM, PA_12 USB_DP (with 1.5k pull-up)
-#else
-BufferedSerial pc(PC_10_ALT0, PC_11_ALT0, 115200); // UART_4
 #endif
 
 #endif
-
-#endif