diff --git a/CMakelists.txt b/CMakelists.txt
index 1130a01..5abe097 100644
--- a/CMakelists.txt
+++ b/CMakelists.txt
@@ -27,7 +27,7 @@ target_sources(${CMAKE_PROJECT_NAME} PRIVATE
   src/ram.c
   src/cpu.c
   src/rom.c
-  src/memory.c
+  src/mem.c
   src/file.c
   src/screen.c
 )
diff --git a/inc/file.h b/inc/file.h
index ebacf7e..11c0e26 100644
--- a/inc/file.h
+++ b/inc/file.h
@@ -1,6 +1,10 @@
 #ifndef FILE_H
 #define FILE_H
 
+#define STATUS_ERROR 1
+#define STATUS_EOF 2
+#define STATUS_READY 4
+
 #define COMMAND_OPEN 1
 #define COMMAND_CLOSE 2
 #define COMMAND_SELECT_IN 3
diff --git a/inc/io.h b/inc/io.h
index b3e1bf7..8ce3e15 100644
--- a/inc/io.h
+++ b/inc/io.h
@@ -11,7 +11,8 @@
 #define ROM_BANKED_OUT 2
 #define FILE_COMMAND 3
 #define FILE_DESCRIPTOR 4
-#define FILE_DATA 5 // two bytes, for pointer to string
+#define FILE_DATA 5 // data, low byte of string pointer
+#define FILE_DATA_HIGH 6 // high byte of string pointer
 #define FILE_STATUS 7
 
 #endif // IO_H
\ No newline at end of file
diff --git a/inc/memory.h b/inc/mem.h
similarity index 88%
rename from inc/memory.h
rename to inc/mem.h
index c5ad49c..0e18873 100644
--- a/inc/memory.h
+++ b/inc/mem.h
@@ -1,5 +1,5 @@
-#ifndef MEMORY_H
-#define MEMORY_H
+#ifndef MEM_H
+#define MEM_H
 
 #include <stdint.h>
 
diff --git a/rom/extra.s b/rom/extra.s
index 9f9b9cc..1be94ba 100644
--- a/rom/extra.s
+++ b/rom/extra.s
@@ -29,6 +29,7 @@ CHRIN:
         lda IO_KBD
         bmi @end
         jsr CHROUT ; echo
+        rts
 @file:
         lda IO_COMMAND_READ
         sta IO_FILE_COMMAND
@@ -41,11 +42,14 @@ CHRIN:
         rts
 
 CHROUT:
+        pha
         lda CURDVC
         bne @file
+        pla
         sta IO_SCREEN
         rts
 @file:
+        pla
         sta IO_FILE_DATA
         lda IO_COMMAND_WRITE
         sta IO_FILE_COMMAND
@@ -84,15 +88,28 @@ OPEN:
         lda IO_FILE_STATUS
         and #FILE_STATUS_READY
         beq @wait
-        lda #FILE_STATUS_READY
-        and #$01
+        lda IO_FILE_STATUS
+        and #FILE_STATUS_ERROR
         bne @error
         rts
 @error:
-        jmp     IQERR
+        jmp IQERR
 
 CLOSE:
+        jsr GETBYT
+        stx IO_FILE_DESCRIPTOR
+        lda #IO_COMMAND_CLOSE
+        sta IO_FILE_COMMAND
+@wait:
+        lda IO_FILE_STATUS
+        and #FILE_STATUS_READY
+        beq @wait
+       lda IO_FILE_STATUS
+        and #FILE_STATUS_ERROR
+        bne @error
         rts
+@error:
+        jmp IQERR
 
 ; Default
 
diff --git a/rom/init.s b/rom/init.s
index e294e8e..365f9be 100644
--- a/rom/init.s
+++ b/rom/init.s
@@ -7,6 +7,8 @@ PR_WRITTEN_BY:
       jsr     STROUT
 
 COLD_START:
+      lda     #$00
+      sta     CURDVC
       ldx     #$FF
       stx     CURLIN+1
       ldx     #$FB
diff --git a/rom/zeropage.s b/rom/zeropage.s
index 67c9e9d..13ebf11 100644
--- a/rom/zeropage.s
+++ b/rom/zeropage.s
@@ -149,11 +149,11 @@ SGNCPR = STRNG1
 FACEXTENSION = STRNG1+1
 STRNG2:
 	.res 2
+CURDVC:
+	.res 1
+FILE_NAME_BUFFER = $0300
 CHRGET:
 TXTPTR = <(GENERIC_TXTPTR-GENERIC_CHRGET + CHRGET)
 CHRGOT = <(GENERIC_CHRGOT-GENERIC_CHRGET + CHRGET)
 CHRGOT2 = <(GENERIC_CHRGOT2-GENERIC_CHRGET + CHRGET)
-RNDSEED = <(GENERIC_RNDSEED-GENERIC_CHRGET + CHRGET)
-CURDVC:
-	.res 1
-FILE_NAME_BUFFER = $0300
\ No newline at end of file
+RNDSEED = <(GENERIC_RNDSEED-GENERIC_CHRGET + CHRGET)
\ No newline at end of file
diff --git a/src/cpu.c b/src/cpu.c
index 5baff85..e08b998 100644
--- a/src/cpu.c
+++ b/src/cpu.c
@@ -1,6 +1,6 @@
 #include "cpu.h"
 
-#include "memory.h"
+#include "mem.h"
 #include "opcodes.h"
 
 #define COMBINE(H, L) ((H << 8) | L)
diff --git a/src/file.c b/src/file.c
index 4c92210..9ad3a0e 100644
--- a/src/file.c
+++ b/src/file.c
@@ -7,21 +7,33 @@
 FILE *files[256];
 
 int openFile(int fd, const char *path) {
-  files[fd] = fopen(path, "r+");
-  if (files[fd] == NULL) {
-    return errno;
+  if (files[fd] != NULL) {
+    return STATUS_READY | STATUS_ERROR;
   }
 
-  return 0;
+  files[fd] = fopen(path, "w+");
+  if (files[fd] == NULL) {
+    return STATUS_READY | STATUS_ERROR;
+  }
+
+  return STATUS_READY;
 }
 
 int closeFile(int fd) {
-  int ret = fclose(files[fd]);
-  if (ret != 0) {
-    return errno;
+  FILE *f = files[fd];
+
+  if (f == NULL) {
+    return STATUS_READY | STATUS_ERROR;
   }
 
-  return 0;
+  int ret = fclose(files[fd]);
+  if (ret != 0) {
+    return STATUS_READY | STATUS_ERROR;
+  }
+
+  files[fd] = NULL;
+
+  return STATUS_READY;
 }
 
 int readByte(const int fd, int *data) {
@@ -32,15 +44,13 @@ int readByte(const int fd, int *data) {
     int error = ferror(files[fd]);
     int eof = feof(files[fd]);
     if (error != 0) {
-      status = 0x2;
+      status = STATUS_ERROR;
     } else if (eof != 0) {
-      status = 0x1;
-    } else {
-      status = 0x4;
+      status = STATUS_EOF;
     }
   }
 
-  return status;
+  return STATUS_READY | status;
 }
 
 int writeByte(const int fd, const int data) {
@@ -51,13 +61,11 @@ int writeByte(const int fd, const int data) {
     int error = ferror(files[fd]);
     int eof = feof(files[fd]);
     if (error != 0) {
-      status = 0x2;
+      status = STATUS_ERROR;
     } else if (eof != 0) {
-      status = 0x1;
-    } else {
-      status = 0x4;
+      status = STATUS_EOF;
     }
   }
 
-  return status;
+  return STATUS_READY | status;
 }
\ No newline at end of file
diff --git a/src/memory.c b/src/mem.c
similarity index 83%
rename from src/memory.c
rename to src/mem.c
index a1583d2..375e1d4 100644
--- a/src/memory.c
+++ b/src/mem.c
@@ -1,4 +1,4 @@
-#include "memory.h"
+#include "mem.h"
 
 uint8_t readMemory(uint16_t address, uint8_t *ram, uint8_t *rom) {
   // RAM/ROM
@@ -64,10 +64,13 @@ void writeMemory(uint16_t address, uint8_t value, uint8_t *ram) {
       break;
 
     case FILE_COMMAND: {
-      switch (ram[IO_BASE + FILE_COMMAND]) {
+      switch (value) {
         case COMMAND_OPEN: {
           ram[IO_BASE + FILE_STATUS] = 0;
-          ram[IO_BASE + FILE_STATUS] = openFile(ram[IO_BASE + FILE_DESCRIPTOR], (const char *)&ram[IO_BASE + FILE_DATA]);
+
+          uint16_t fileAddress = ram[IO_BASE + FILE_DATA] | ((uint16_t)ram[IO_BASE + FILE_DATA_HIGH] << 8);
+
+          ram[IO_BASE + FILE_STATUS] = openFile(ram[IO_BASE + FILE_DESCRIPTOR], (const char *)&ram[fileAddress]);
           break;
         }
         case COMMAND_CLOSE: {
@@ -89,6 +92,10 @@ void writeMemory(uint16_t address, uint8_t value, uint8_t *ram) {
       ram[IO_BASE + FILE_DATA] = value;
       break;
     }
+    case FILE_DATA_HIGH: {
+      ram[IO_BASE + FILE_DATA_HIGH] = value;
+      break;
+    }
 
     default:
       break;