diff -rupN st-0.8.1.original/config.def.h st-0.8.1/config.def.h
--- st-0.8.1.original/config.def.h	2018-03-20 22:29:59.000000000 +0200
+++ st-0.8.1/config.def.h	2018-04-24 01:23:49.669365424 +0300
@@ -118,7 +118,11 @@ static const char *colorname[] = {
  */
 unsigned int defaultfg = 7;
 unsigned int defaultbg = 0;
-static unsigned int defaultcs = 256;
+
+//static unsigned int defaultcs = 256;
+static unsigned int defaultcs1 = 10; // green cursor
+static unsigned int defaultcs2 = 9; // red cursor
+
 static unsigned int defaultrcs = 257;
 
 /*
diff -rupN st-0.8.1.original/x.c st-0.8.1/x.c
--- st-0.8.1.original/x.c	2018-03-20 22:29:59.000000000 +0200
+++ st-0.8.1/x.c	2018-04-24 01:24:08.017487621 +0300
@@ -20,6 +20,15 @@ static char *argv0;
 #include "st.h"
 #include "win.h"
 
+int get_scroll_lock()
+{
+        Display *dpy = XOpenDisplay(":0");
+        XKeyboardState x;
+        XGetKeyboardControl(dpy, &x);
+        XCloseDisplay(dpy);
+        return !!(x.led_mask&4);
+}
+
 /* types used in config.h */
 typedef struct {
 	uint mod;
@@ -1400,6 +1409,13 @@ xdrawglyph(Glyph g, int x, int y)
 void
 xdrawcursor(int cx, int cy, Glyph g, int ox, int oy, Glyph og)
 {
+        unsigned int defaultcs;
+
+        if (get_scroll_lock())
+                defaultcs=defaultcs2;
+        else
+                defaultcs=defaultcs1;
+
 	Color drawcol;
 
 	/* remove the old cursor */