diff --git a/am/arch/riscv64-xs-dual.mk b/am/arch/riscv64-xs-dual.mk
index d0e11874..9fdcd2e2 100644
--- a/am/arch/riscv64-xs-dual.mk
+++ b/am/arch/riscv64-xs-dual.mk
@@ -9,11 +9,9 @@ AM_SRCS := noop/isa/riscv/trm.c \
            nemu/isa/riscv/cte64.c \
            nemu/isa/riscv/mtime.S \
            nemu/isa/riscv/vme.c \
-           nemu/common/ioe.c \
+           xs/common/ioe.c \
            noop/common/input.c \
            noop/common/timer.c \
-           nemu/common/video.c \
-           dummy/audio.c \
            noop/isa/riscv/instr.c \
            xs/isa/riscv/mpe.c \
            xs/isa/riscv/clint.c \
diff --git a/am/arch/riscv64-xs-flash.mk b/am/arch/riscv64-xs-flash.mk
index 270e2e0e..2131a606 100644
--- a/am/arch/riscv64-xs-flash.mk
+++ b/am/arch/riscv64-xs-flash.mk
@@ -6,11 +6,9 @@ AM_SRCS := noop/isa/riscv/trm_flash.c \
            noop/common/uartlite.c \
            nemu/isa/riscv/trap.S \
            nemu/isa/riscv/vme.c \
-           nemu/common/ioe.c \
+           xs/common/ioe.c \
            noop/common/input.c \
            noop/common/timer.c \
-           nemu/common/video.c \
-           dummy/audio.c \
            noop/isa/riscv/instr.c \
            xs/isa/riscv/mpe.c \
            xs/isa/riscv/clint.c \
diff --git a/am/arch/riscv64-xs.mk b/am/arch/riscv64-xs.mk
index 1f96d6c9..93f0f7f4 100644
--- a/am/arch/riscv64-xs.mk
+++ b/am/arch/riscv64-xs.mk
@@ -9,11 +9,9 @@ AM_SRCS := noop/isa/riscv/trm.c \
            nemu/isa/riscv/cte64.c \
            nemu/isa/riscv/mtime.S \
            nemu/isa/riscv/vme.c \
-           nemu/common/ioe.c \
+           xs/common/ioe.c \
            noop/common/input.c \
            noop/common/timer.c \
-           nemu/common/video.c \
-           dummy/audio.c \
            noop/isa/riscv/instr.c \
            xs/isa/riscv/mpe.c \
            xs/isa/riscv/clint.c \
diff --git a/am/src/xs/common/ioe.c b/am/src/xs/common/ioe.c
new file mode 100644
index 00000000..566bdf2d
--- /dev/null
+++ b/am/src/xs/common/ioe.c
@@ -0,0 +1,26 @@
+#include <am.h>
+#include <amdev.h>
+
+void __am_timer_init();
+
+int _ioe_init() {
+  __am_timer_init();
+  return 0;
+}
+
+size_t __am_timer_read(uintptr_t reg, void *buf, size_t size);
+size_t __am_input_read(uintptr_t reg, void *buf, size_t size);
+
+size_t _io_read(uint32_t dev, uintptr_t reg, void *buf, size_t size) {
+  switch (dev) {
+    case _DEV_INPUT: return __am_input_read(reg, buf, size);
+    case _DEV_TIMER: return __am_timer_read(reg, buf, size);
+  }
+  return 0;
+}
+
+size_t _io_write(uint32_t dev, uintptr_t reg, void *buf, size_t size) {
+  switch (dev) {
+  }
+  return 0;
+}