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diff --git a/keyboards/jj40/keymaps/oscillope/backlight.c b/keyboards/jj40/keymaps/oscillope/backlight.c
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+/**
+ * Backlighting code for PS2AVRGB boards (ATMEGA32A)
+ * Kenneth A. (github.com/krusli | krusli.me)
+ */
+
+#include "quantum.h"
+
+#include <avr/pgmspace.h>
+#include <avr/interrupt.h>
+
+// Port D: digital pins of the AVR chipset
+#define NUMLOCK_PORT (1 << 1) // 1st pin of Port D (digital)
+#define CAPSLOCK_PORT (1 << 2) // 2nd pin
+#define BACKLIGHT_PORT (1 << 4) // 4th pin
+#define SCROLLLOCK_PORT (1 << 6) // 6th pin
+
+/**
+ * References
+ * Port Registers: https://www.arduino.cc/en/Reference/PortManipulation
+ * TCCR1A: https://electronics.stackexchange.com/questions/92350/what-is-the-difference-between-tccr1a-and-tccr1b
+ * Timers: http://www.avrbeginners.net/architecture/timers/timers.html
+ * 16-bit timer setup: http://sculland.com/ATmega168/Interrupts-And-Timers/16-Bit-Timer-Setup/
+ * PS2AVRGB firmware: https://github.com/showjean/ps2avrU/tree/master/firmware
+ */
+
+// @Override
+// turn LEDs on and off depending on USB caps/num/scroll lock states.
+void led_set_user(uint8_t usb_led) {
+/* It appears that these cause the v1 JJ40 PCB to hang.
+ * I haven't looked into why, but I don't have any LEDs on my board anyway. */
+#if 0
+ if (usb_led & (1 << USB_LED_NUM_LOCK)) {
+ // turn on
+ DDRD |= NUMLOCK_PORT;
+ PORTD |= NUMLOCK_PORT;
+ } else {
+ // turn off
+ DDRD &= ~NUMLOCK_PORT;
+ PORTD &= ~NUMLOCK_PORT;
+ }
+
+ if (usb_led & (1 << USB_LED_CAPS_LOCK)) {
+ DDRD |= CAPSLOCK_PORT;
+ PORTD |= CAPSLOCK_PORT;
+ } else {
+ DDRD &= ~CAPSLOCK_PORT;
+ PORTD &= ~CAPSLOCK_PORT;
+ }
+
+ if (usb_led & (1 << USB_LED_SCROLL_LOCK)) {
+ DDRD |= SCROLLLOCK_PORT;
+ PORTD |= SCROLLLOCK_PORT;
+ } else {
+ DDRD &= ~SCROLLLOCK_PORT;
+ PORTD &= ~SCROLLLOCK_PORT;
+ }
+#endif
+}
+