Diff being reverted:
diff --git a/cnc/01-setup.c b/cnc/01-setup.c
index e7acb25..4eb07fa 100644
--- a/cnc/01-setup.c
+++ b/cnc/01-setup.c
@@ -18,7 +18,7 @@ uint8_t const pin_enab  = 1U << 5;
 #define portc_use (pin_xend | pin_yend | pin_zend | pin_aend | pin_enab)
 #define portc_out pin_enab
 
-// PORTA
+// PORTD
 uint8_t const pin_xstep = 1U << 4;		// temporarily D4
 uint8_t const pin_xdir  = 1U << 1;
 uint8_t const pin_ystep = 1U << 2;