diff --git a/kernel.c b/kernel.c
index a584b6c..418799d 100644
--- a/kernel.c
+++ b/kernel.c
@@ -1,19 +1,20 @@
 #include"stdio.h"
+#include"stdint.h"
 #include"stdbool.h"
 
 #define at at8
 #define at8(x) (*(char*)x)
 
-unsigned char kbdus[128]={0,27,'1','2','3','4','5','6','7','8','9','0','-','=','\b','\t','q','w','e','r','t','y','u','i','o','p','[',']','\n',0,'a','s','d','f','g','h','j','k','l',';','\'','`',0,'\\','z','x','c','v','b','n','m',',','.','/',0,'*',0,' ',0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,'-',0,0,0,'+',0,0,0,0,0,0,0,0,0,0,0};
+uint8_t kbdus[128]={0,27,'1','2','3','4','5','6','7','8','9','0','-','=','\b','\t','q','w','e','r','t','y','u','i','o','p','[',']','\n',0,'a','s','d','f','g','h','j','k','l',';','\'','`',0,'\\','z','x','c','v','b','n','m',',','.','/',0,'*',0,' ',0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,'-',0,0,0,'+',0,0,0,0,0,0,0,0,0,0,0};
 
-void outb(unsigned short port,unsigned char val)
+void outb(uint16_t port,uint8_t val)
 {
     asm("out %0,%1"::"a"(val),"Nd"(port));
 }
 
-unsigned char inb(unsigned short port)
+uint8_t inb(uint16_t port)
 {
-    unsigned char ret;
+    uint8_t ret;
 	asm("in %1,%0":"=a"(ret):"Nd"(port));
     return ret;
 }
@@ -27,38 +28,52 @@ __attribute__ ((naked)) static void halt(void)
 	);
 }
 
+
+uint8_t*const vram=(uint8_t*)0xB8000;
+void putpixel(uint8_t*const screen,int32_t x,int32_t y,int32_t color)
+{
+	const uint32_t width=320;
+	const uint32_t height=240;
+	uint32_t where=x*width+y*height;
+	screen[where]=color&0xff;
+	screen[where+1]=(color>>8)&0xff;
+	screen[where+2]=(color>>16)&0xff;
+}
+
 // Entry point
-void kernelmain(void*multiboot_structure,unsigned magicnumber)
+void kernelmain(void*multiboot_structure,uint32_t magicnumber)
 {
 
 	// Clear text mode buffer
-	for(int i=0;i<1000;++i)
-		((unsigned short*)0xb8000)[i]=0;
+	for(int32_t i=0;i<1000;++i)
+		((uint16_t*)0xb8000)[i]=0;
 
 	puts("");
 	puts("");
 	puts("This is an operating system or something.");
 
 	print("Multiboot structure:");
-	printi16((int)multiboot_structure);
+	printi16((int32_t)multiboot_structure);
 	puts("");
 
 	print("Magic number:");
-	printi16((int)magicnumber);
+	printi16((int32_t)magicnumber);
 	puts("");
 
-	//((char*)0x64)[0]=(unsigned char)0xaa;
+	putpixel(vram,3,3,0x0000ffff);
+
+	//((char*)0x64)[0]=(uint8_t)0xaa;
 	outb(0x64,0xaa);
 	outb(0x64,0xee);
 
-	unsigned int lastchar=0;
+	uint32_t lastchar=0;
 
 	stdout->seek=0;
 	// Check PS/2 status register
 	while(true)
 	{
 
-		unsigned int r=inb(0x60);
+		uint32_t r=inb(0x60);
 		while(!(r&0x80)&&(r!=lastchar))
 		{
 			if(r=='\b')stdout->seek-=2;
diff --git a/stdbool.h b/stdbool.h
index a54c6aa..7745cdf 100644
--- a/stdbool.h
+++ b/stdbool.h
@@ -1,4 +1,5 @@
 #pragma once
 
+typedef unsigned char bool;
 #define true 1
 #define false 0
diff --git a/stdint.h b/stdint.h
new file mode 100644
index 0000000..1aedd80
--- /dev/null
+++ b/stdint.h
@@ -0,0 +1,9 @@
+#pragma once
+
+typedef unsigned char uint8_t;
+typedef unsigned long uint32_t;
+typedef unsigned short uint16_t;
+
+typedef char int8_t;
+typedef long int32_t;
+typedef short int16_t;
diff --git a/stdio.c b/stdio.c
index c9e3b29..e2b9f17 100644
--- a/stdio.c
+++ b/stdio.c
@@ -1,6 +1,7 @@
 #include"stdio.h"
+#include"stdint.h"
 
-FILE*stdout=&(FILE){.fd=0,.offset=(unsigned short*)0xb8000,.seek=0};
+FILE*stdout=&(FILE){.fd=0,.offset=(uint16_t*)0xb8000,.seek=0};
 
 void fputc(char c,FILE*f)
 {
@@ -13,7 +14,7 @@ void fputc(char c,FILE*f)
 // puts to FILE
 void fputs(FILE*f,char*s)
 {
-	for(unsigned i=0;s[i];++i)
+	for(uint32_t i=0;s[i];++i)
 		//*f->offset++=0x1f00|s[i];
 		fputc(s[i],f);
 	fputc('\n',f);
@@ -22,15 +23,15 @@ void fputs(FILE*f,char*s)
 // print to FILE
 void fprint(FILE*f,char*s)
 {
-	for(unsigned i=0;s[i];++i)
+	for(uint32_t i=0;s[i];++i)
 		fputc(s[i],f);
 }
 
 // print integer
-void fprinti(FILE*f,int d)
+void fprinti(FILE*f,int32_t d)
 {
 	char b[32];
-	int i=0;
+	int32_t i=0;
 
 	if(d<0)
 	{
@@ -41,38 +42,38 @@ void fprinti(FILE*f,int d)
 	// Get each digit as character
 	while(d>0)
 	{
-		int m=d%10;
+		int32_t m=d%10;
 		d/=10;
 		b[i++]=m+'0';
 	}
 	b[i]=0;
 
 	// Print reversed string
-	for(i;i>=0;--i)
+	for(;i>=0;--i)
 		if(b[i]>31)
 			fputc(b[i],f);
 }
 
 // print integer (hex)
-void fprinti16(FILE*f,unsigned int d)
+void fprinti16(FILE*f,uint32_t d)
 {
 	static char g[]={'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'};
 	static char b[32];
-	int i=0;
+	int32_t i=0;
 
 	fprint(f,"0x");
 
 	// Get each digit as character
 	while(d>0)
 	{
-		unsigned int m=d%16;
+		uint32_t m=d%16;
 		d/=16;
 		b[i++]=g[m];
 	}
 	b[i]=0;
 
 	// Print reversed string
-	for(i;i>=0;--i)
+	for(;i>=0;--i)
 		if(b[i]>31)
 			fputc(b[i],f);
 }
diff --git a/stdio.h b/stdio.h
index 77ff35e..510dbef 100644
--- a/stdio.h
+++ b/stdio.h
@@ -5,22 +5,24 @@
 
 #pragma once
 
+#include"stdint.h"
+
 #define SPACE "                                                                                                "
 #define WIDTH 80
 
 // FILE type
 typedef struct FILE
 {
-	unsigned fd;
-	unsigned short*offset;
-	unsigned int seek;
+	uint32_t fd;
+	uint16_t*offset;
+	uint32_t seek;
 } FILE;
 
 extern FILE*stdout;
 
 void fprint(FILE*f,char*s);
-void fprinti(FILE*f,int d);
-void fprinti16(FILE*f,unsigned int d);
+void fprinti(FILE*f,int32_t d);
+void fprinti16(FILE*f,uint32_t d);
 void fputc(char c,FILE*f);
 void fputs(FILE*f,char*s);