diff --git a/src/d_main/mod.rs b/src/d_main/mod.rs
index a38d938..fb6cf80 100644
--- a/src/d_main/mod.rs
+++ b/src/d_main/mod.rs
@@ -10,6 +10,7 @@ use crate::m_argv::M_GetOptionalArgumentValueByArgument;
 use crate::m_argv::PARM_NOT_FOUND;
 use crate::m_misc::M_LoadDefaults;
 
+use crate::v_video::V_Init;
 use crate::w_wad::{W_CheckNumForName, W_InitMultipleFiles};
 
 use crate::doomdef::{
@@ -400,18 +401,17 @@ pub fn D_DoomMain() {
         }
     }
 
-    // TODO: Implement subsytem inits
-    /*
+    
     println!("V_Init: allocate screens.");
     V_Init();
-    */
+
     println!("M_LoadDefaults: Load system defaults.");
     M_LoadDefaults();
 
-    /*
-    println!("Z_init: Init zone memory allocation daemon.");
-    Z_Init();
+    /* TODO: Implement subsytem inits
     
+    println!("Z_init: Init zone memory allocation daemon.");
+    Z_Init();    
      */
     println!("W_Init: Init WADfiles");
     W_InitMultipleFiles(DOOMGLOBALS::with_ref(|g| g.wadfiles.clone()));  // we are loading so how cares about a borrow
diff --git a/src/doomdef.rs b/src/doomdef/mod.rs
similarity index 80%
rename from src/doomdef.rs
rename to src/doomdef/mod.rs
index 62c8ae0..185d886 100644
--- a/src/doomdef.rs
+++ b/src/doomdef/mod.rs
@@ -1,7 +1,35 @@
 use std::cell::RefCell;
 
+/// DOOM version
 pub const VERSION:i32 =  110;
-pub const D_DEVSTR: &str =	"Development mode ON.";
+
+/// BASE_WIDTH
+/// For resize of screen, at start of game.
+/// It will not work dynamically, see visplanes. TODO: Investigate what this means.
+pub const BASE_WIDTH: i32 = 320;
+
+/// Screen scale multiplier?
+/// Original source comment:
+/// It is educational but futile to change this
+///  scaling e.g. to 2. Drawing of status bar,
+///  menues etc. is tied to the scale implied
+///  by the graphics.
+pub const SCREEN_MUL: i32 =	1;
+
+/// Inverse of the aspect ratio
+pub const INV_ASPECT_RATIO: f32 = 0.625; // 0.75, ideally according to the original source
+
+/// SCREENWIDTH 
+/// = SCREEN_MUL*BASE_WIDTH //320
+pub const SCREENWIDTH: i32 = 320;
+
+/// SCREENHEIGHT
+/// (int)(SCREEN_MUL*BASE_WIDTH*INV_ASPECT_RATIO) //200
+pub const SCREENHEIGHT:i32 = 200;
+
+
+/// The maximum number of players, multiplayer/networking.
+pub const MAXPLAYERS: i32 = 4;
 
 /// The number of state updates (ticks) to be done per second
 pub const TICRATE: i32 = 35;
diff --git a/src/doomtype/mod.rs b/src/doomtype/mod.rs
new file mode 100644
index 0000000..367cb12
--- /dev/null
+++ b/src/doomtype/mod.rs
@@ -0,0 +1,10 @@
+const MAXCHAR: i8 = i8::MAX;
+const MAXSHORT: i16 = i16::MAX;
+const MAXINT: i32 = i32::MAX;
+const MAXLONG: i32 = i32::MAX;
+
+// Minimum values
+const MINCHAR: i8 = i8::MIN;
+const MINSHORT: i16 = i16::MIN;
+const MININT: i32 = i32::MIN;
+const MINLONG: i32 = i32::MIN;
\ No newline at end of file
diff --git a/src/m_misc/mod.rs b/src/m_misc/mod.rs
index 8e8582d..e6a08ef 100644
--- a/src/m_misc/mod.rs
+++ b/src/m_misc/mod.rs
@@ -1,20 +1,10 @@
 use std::ptr::addr_of_mut;
 
 use crate::d_strings;
+use crate::doomtype;
 use crate::hu_stuff::get_chat_macro_ptr;
 use crate::m_argv::{M_CheckParm, M_GetOptionalArgumentValueByArgument, PARM_NOT_FOUND};
 
-const MAXCHAR: i8 = i8::MAX;
-const MAXSHORT: i16 = i16::MAX;
-const MAXINT: i32 = i32::MAX;
-const MAXLONG: i32 = i32::MAX;
-
-// Minimum values
-const MINCHAR: i8 = i8::MIN;
-const MINSHORT: i16 = i16::MIN;
-const MININT: i32 = i32::MIN;
-const MINLONG: i32 = i32::MIN;
-
 
 
 // static mut variable stuff
@@ -280,7 +270,6 @@ pub fn M_WriteFile(name: &str, source: std::fs::File, length: i64) {
 }
 
 #[allow(non_snake_case)]
-
 pub fn M_ReadFile(name: &str, buffer: Vec<u8>) {
 
 }
diff --git a/src/main.rs b/src/main.rs
index 6edb62b..1b18085 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,9 +1,11 @@
 mod d_main;
 mod d_strings;
 mod doomdef;
+mod doomtype;
 mod hu_stuff;
 mod m_argv;
 mod m_misc;
+mod v_video;
 mod w_wad;
 mod math;
 
diff --git a/src/v_video/mod.rs b/src/v_video/mod.rs
new file mode 100644
index 0000000..372b305
--- /dev/null
+++ b/src/v_video/mod.rs
@@ -0,0 +1,43 @@
+use crate::doomdef::{SCREENHEIGHT, SCREENWIDTH};
+use crate::doomtype;
+
+pub const CENTERY: i32 = SCREENHEIGHT / 2;
+
+// static var stuff
+#[allow(non_upper_case_globals)]
+static mut screens: [[u8; (SCREENWIDTH*SCREENHEIGHT) as usize]; 5] = [[0u8; (SCREENWIDTH*SCREENHEIGHT) as usize]; 5];
+
+
+#[allow(non_snake_case)]
+pub fn V_Init() {
+    // Do nothing :)
+    // the memory is already allocated
+}
+
+#[allow(non_snake_case)]
+pub fn V_CopyRect(srcx: i32, srcy: i32, srcscrn: i32, width: i32, height: i32, destx: i32, desty: i32, destscrn: i32) {
+
+}
+
+/* 
+TODO: Implement "r_data"
+#[allow(non_snake_case)]
+pub fn V_DrawPatch(x: i32, y: i32, scrn: i32, patch: Vec<patch_t>) {
+
+}
+
+#[allow(non_snake_case)]
+pub fn V_DrawPatchDirect(x: i32, y: i32, scrn: i32, patch: Vec<patch_t>) {
+
+}
+*/
+
+#[allow(non_snake_case)]
+pub fn V_GetBlock(x: i32, y: i32, scrn: i32, width: i32, height: i32, dest: Vec<u8>) {
+
+}
+
+#[allow(non_snake_case)]
+pub fn V_MarkRect(x: i32, y: i32, width: i32, height: i32) {
+
+}