diff --git a/cli_main.c b/cli_main.c
index 1881ff0..1c09057 100644
--- a/cli_main.c
+++ b/cli_main.c
@@ -1,8 +1,8 @@
-#include "bank.h"
 #include "base.h"
 #include "field.h"
 #include "gbuffer.h"
 #include "sim.h"
+#include "vmio.h"
 #include <getopt.h>
 
 static void usage(void) {
diff --git a/sim.h b/sim.h
index 039e8c4..1c10283 100644
--- a/sim.h
+++ b/sim.h
@@ -1,6 +1,6 @@
 #pragma once
-#include "bank.h"
 #include "base.h"
+#include "vmio.h"
 
 void orca_run(Glyph *restrict gbuffer, Mark *restrict mbuffer, Usz height,
               Usz width, Usz tick_number, Oevent_list *oevent_list,
diff --git a/tool b/tool
index 04bbd4c..9920d08 100755
--- a/tool
+++ b/tool
@@ -329,7 +329,7 @@ build_target() {
       ;;
   esac
 
-  add source_files gbuffer.c field.c bank.c sim.c
+  add source_files gbuffer.c field.c vmio.c sim.c
   case $1 in
     cli)
       add source_files cli_main.c
diff --git a/tui_main.c b/tui_main.c
index 7dfd66d..dfb0662 100644
--- a/tui_main.c
+++ b/tui_main.c
@@ -1,4 +1,3 @@
-#include "bank.h"
 #include "base.h"
 #include "field.h"
 #include "gbuffer.h"
@@ -7,6 +6,7 @@
 #include "sim.h"
 #include "sysmisc.h"
 #include "term_util.h"
+#include "vmio.h"
 #include <getopt.h>
 #include <locale.h>
 
diff --git a/bank.c b/vmio.c
similarity index 98%
rename from bank.c
rename to vmio.c
index 6a196dd..95f674d 100644
--- a/bank.c
+++ b/vmio.c
@@ -1,4 +1,4 @@
-#include "bank.h"
+#include "vmio.h"
 
 void oevent_list_init(Oevent_list *olist) {
   olist->buffer = NULL;
diff --git a/bank.h b/vmio.h
similarity index 100%
rename from bank.h
rename to vmio.h