diff --git a/hw/isa.h b/hw/isa.h
new file mode 100644
index 0000000..89b3004
--- /dev/null
+++ b/hw/isa.h
@@ -0,0 +1,24 @@
+/* ISA bus */
+
+extern target_phys_addr_t isa_mem_base;
+
+int register_ioport_read(int start, int length, int size,
+                         IOPortReadFunc *func, void *opaque);
+int register_ioport_write(int start, int length, int size,
+                          IOPortWriteFunc *func, void *opaque);
+void isa_unassign_ioport(int start, int length);
+
+void isa_mmio_init(target_phys_addr_t base, target_phys_addr_t size);
+
+/* dma.c */
+int DMA_get_channel_mode (int nchan);
+int DMA_read_memory (int nchan, void *buf, int pos, int size);
+int DMA_write_memory (int nchan, void *buf, int pos, int size);
+void DMA_hold_DREQ (int nchan);
+void DMA_release_DREQ (int nchan);
+void DMA_schedule(int nchan);
+void DMA_run (void);
+void DMA_init (int high_page_enable);
+void DMA_register_channel (int nchan,
+                           DMA_transfer_handler transfer_handler,
+                           void *opaque);