diff --git a/build.bat b/build.bat
index 3f135f8..ec2a292 100644
--- a/build.bat
+++ b/build.bat
@@ -8,6 +8,6 @@ pushd .\build
 
 set links= kernel32.lib
 
-cl ..\src\eightysix.c /Feeightysix.exe /nologo /link %links%
+cl /Zi ..\src\eightysix.c /Feeightysix.exe /nologo /link %links%
 
 popd .\build
diff --git a/src/base.c b/src/base.c
new file mode 100644
index 0000000..fb9ba67
--- /dev/null
+++ b/src/base.c
@@ -0,0 +1,29 @@
+
+internal void
+arena_init(Arena *arena, u8 *backing_buffer, i32 size)
+{
+  arena->backing_buffer = backing_buffer;
+  arena->offset = 0;
+  arena->size = size;
+}
+
+internal void *
+arena_alloc(Arena *arena, i32 size)
+{
+  void *result = 0;
+
+  if (arena->offset + size <= arena->size) {
+    result = &arena->backing_buffer[arena->offset];
+    arena->offset += size;
+  } else {
+    printf("Arena ran out of memory\n");
+  }
+
+  return result;
+}
+
+internal void
+arena_release(Arena *arena)
+{
+  arena->offset = 0;
+}
diff --git a/src/base.h b/src/base.h
new file mode 100644
index 0000000..b68df4f
--- /dev/null
+++ b/src/base.h
@@ -0,0 +1,54 @@
+#ifndef BASE_H
+#define BASE_H
+
+#include <stdio.h>
+#include <stdint.h>
+
+//= rhjr: types
+
+typedef uint8_t  u8;
+typedef uint16_t u16;
+typedef uint32_t u32;
+typedef uint64_t u64;
+
+typedef int8_t   i8;
+typedef int16_t  i16;
+typedef int32_t  i32;
+typedef int64_t  i64;
+
+typedef uint8_t  b8;
+typedef uint16_t b16;
+typedef uint32_t b32;
+typedef uint64_t b64;
+
+#define internal static
+#define global   static
+
+//= rhjr: allocator
+
+#define ARENA_DEFAULT_SIZE 2048
+
+typedef struct Arena
+{
+  u8 *backing_buffer;
+  i32 offset;
+  i32 size;
+}
+Arena;
+
+internal void   arena_init(Arena *arena, u8 *backing_buffer, i32 size);
+internal void * arena_alloc(Arena *arena, i32 size);
+internal void   arena_release(Arena *arena);
+
+//= rhjr: strings
+
+typedef struct String8
+{
+  u8* contents;
+  i32 length;
+}
+String8;
+
+
+
+#endif // BASE_H
diff --git a/src/eightysix.c b/src/eightysix.c
index 18a8036..ea61ddb 100644
--- a/src/eightysix.c
+++ b/src/eightysix.c
@@ -1,23 +1,33 @@
-j
+
 //= rhjr: [h]
 
+#include "base.h"
 #include "eightysix.h"
-#include "win32_platform.h"
+#include "platform/win32_platform.h"
 
 //= rhjr: [c]
 
-#include "win32_platform.c"
+#include "base.c"
+#include "platform/win32_platform.c"
 
-u8 backing_buffer[2048];
+u8 backing_buffer[ARENA_DEFAULT_SIZE];
 
 int
 main(void)
 {
   Arena arena = {0};
-  arena.backing_buffer = &backing_buffer[0];
-  arena.offset = 0;
-  arena.size = 2048;
+  arena_init(&arena, &backing_buffer[0], ARENA_DEFAULT_SIZE);
 
+  i64 *idx = arena_alloc(&arena, sizeof(i64));
+  *idx = 69;
+
+  i64 *idx2 = arena_alloc(&arena, 2 * sizeof(i64));
+  *idx2++ = 69;
+
+  i64 *idx3 = arena_alloc(&arena, sizeof(i64));
+  *idx3 = 124;
+
+  *idx2 = 139;
 
   return 0;
 }
diff --git a/src/eightysix.h b/src/eightysix.h
index 6f23ff5..12ae8de 100644
--- a/src/eightysix.h
+++ b/src/eightysix.h
@@ -1,46 +1,6 @@
 #ifndef EIGHTYSIX_CORE_H
 #define EIGHTYSIX_CORE_H
 
-#include <stdio.h>
-#include <stdint.h>
-
-//= rhjr: types
-
-typedef uint8_t  u8;
-typedef uint16_t u16;
-typedef uint32_t u32;
-typedef uint64_t u64;
-
-typedef int8_t   i8;
-typedef int16_t  i16;
-typedef int32_t  i32;
-typedef int64_t  i64;
-
-typedef uint8_t  b8;
-typedef uint16_t b16;
-typedef uint32_t b32;
-typedef uint64_t b64;
-
-#define internal static
-#define global   static
-
-typedef struct String8
-{
-  u8* contents;
-  i32 length;
-}
-String8;
-
-//= rhjr: allocator
-
-typedef struct Arena
-{
-  u8 *backing_buffer;
-  i32 offset;
-  i32 size;
-}
-Arena;
-
 //= rhjr: instructions.
 // Intel 8086 manual, pg. 4-22
 
diff --git a/src/win32_platform.c b/src/platform/win32_platform.c
similarity index 60%
rename from src/win32_platform.c
rename to src/platform/win32_platform.c
index 7aa2186..a9075bf 100644
--- a/src/win32_platform.c
+++ b/src/platform/win32_platform.c
@@ -1,6 +1,6 @@
 
 String8 *
-platform_write_file()
+platform_write_file(Arena *arena)
 {
   String8 *result;
 
diff --git a/src/win32_platform.h b/src/platform/win32_platform.h
similarity index 100%
rename from src/win32_platform.h
rename to src/platform/win32_platform.h