diff --git a/82802ab.c b/82802ab.c
index 53930ee..dc6ffbe 100644
--- a/82802ab.c
+++ b/82802ab.c
@@ -30,6 +30,46 @@
 #include "82802ab.h"
 #include "debug.h"
 
+void toggle_ready_82802ab(volatile uint8_t *dst)
+{
+	unsigned int i = 0;
+	uint8_t tmp1, tmp2;
+
+	tmp1 = *dst & 0x40;
+
+	while (i++ < 0xFFFFFF) {
+		tmp2 = *dst & 0x40;
+		if (tmp1 == tmp2) {
+			break;
+		}
+		tmp1 = tmp2;
+	}
+}
+
+void data_polling_82802ab(volatile uint8_t *dst, uint8_t data)
+{
+	unsigned int i = 0;
+	uint8_t tmp;
+
+	data &= 0x80;
+
+	while (i++ < 0xFFFFFF) {
+		tmp = *dst & 0x80;
+		if (tmp == data) {
+			break;
+		}
+	}
+}
+
+void protect_82802ab(volatile uint8_t *bios)
+{
+	*(volatile uint8_t *)(bios + 0x5555) = 0xAA;
+	*(volatile uint8_t *)(bios + 0x2AAA) = 0x55;
+	*(volatile uint8_t *)(bios + 0x5555) = 0xA0;
+
+	usleep(200);
+}
+
 // I need that Berkeley bit-map printer
 void print_82802ab_status(uint8_t status)
 {