diff --git a/doc/DEVICES.txt b/doc/DEVICES.txt
new file mode 100644
index 0000000..7142254
--- /dev/null
+++ b/doc/DEVICES.txt
@@ -0,0 +1,124 @@
+# Overview
+
+Nga provides three instructions for interacting with I/O devices.
+These are:
+
+    ie   i/o enumerate    returns the number of attached devices
+    iq   i/o query        returns information about a device
+    ii   i/o interact     invokes an interaction with a device
+
+As an example, with an implementation providing an output source,
+a block storage system, and keyboard:
+
+    ie    will return `3` since there are three i/o devices
+    0 iq  will return 0 0, since the first device is a screen (0)
+          with a version of 0
+    1 iq  will return 1 3, since the second device is a block
+          storage (3), with a version of 1
+    2 iq  will return 0 1, since the third device is a keyboard
+          (1), with a version of 0
+
+In this case, some interactions can be defined:
+
+    : c:put
+    i liiire..
+    d 0
+    
+    : c:get
+    i liiire..
+    d 2
+
+Setup the stack, push the device ID to the stack, and then use
+`ii` to invoke the interaction.
+
+A RETRO system requires one I/O device (a generic output for a
+single character). This must be the first device, and must have
+a device ID of 0.
+
+All other devices are optional and can be specified in any order.
+
+# Device Types
+
+ ID  | Device Type      | Notes                      |
+-----+------------------+----------------------------+
+0000 | Generic Output   | Always present as device 0 |
+0001 | Keyboard         |                            |
+0002 | Floating Point   |                            |
+0003 | Block Storage    | Raw, 1024 cell blocks      |
+0004 | Filesystem       | Unix-style Files           |
+0005 | Network: Gopher  | Make gopher requests       |
+0006 | Network: HTTP    |                            |
+0007 | Network: Sockets |                            |
+0008 | Syscalls: Unix   |                            |
+0009 | Scripting Hooks  |                            |
+
+# Device Details
+
+## 0000: Generic Output
+
+Revision 0:
+
+This device is used to write a single character to an system
+specific output device.
+
+Takes a single value representing a character, returns nothing.
+
+No subcommands are defined.
+
+## 0001: Keyboard
+
+Revision 0:
+
+Read and return a keypress.
+
+Consumes no data, returns a single value representing the
+character that was read.
+
+No subcommands are defined.
+
+## 0002: Floating Point
+
+Revision 0:
+
+TBD.
+
+## 0003: Block Storage
+
+Reserved for future use.
+
+## 0004: Filesystem
+
+Revision 0:
+
+This implements a device providing traditional Unix-like files.
+
+Takes a value indicating an operation, and each operation takes
+additional values.
+
+    | Operation | Stack | Action                           |
+    | --------- | ----- | -------------------------------- |
+    | 0         | sm-h  | Open a file                      |
+    | 1         | h-    | Close a file                     |
+    | 2         | h-c   | Read a byte from a file          |
+    | 3         | ch-   | Write a byte to a file           |
+    | 4         | h-n   | Return current pointer into file |
+    | 5         | nh-   | Move pointer in a file           |
+    | 6         | h-n   | Return the size of a file        |
+    | 7         | s-    | Delete a file                    |
+    | 8         | h-    | Flush pending writes             |
+
+## 0005: Network: Gopher
+
+Revision 0:
+
+This device fetches resources using the Gopher protocol.
+
+Takes a single value indicating the operation; the operation
+requires additional values.
+
+    | Operation | Stack | Action                           |
+    | --------- | ----- | -------------------------------- |
+    | 0         | asns- | Connect to server (s1), port (n) |
+    |           |       | and request selector (s2). The   |
+    |           |       | returned data is stored at the   |
+    |           |       | destination address (a).         |
diff --git a/interfaces/native/Makefile b/interfaces/native/Makefile
index f0fa886..c6e09aa 100644
--- a/interfaces/native/Makefile
+++ b/interfaces/native/Makefile
@@ -15,6 +15,11 @@ freebsd64:
 	nasm -f elf64 fbsd64.s
 	ld -nostdlib -m elf_x86_64_fbsd fbsd64.o retro.o -o bin/rf.bsd64
 
+openbsd:
+	cc -m64 -static -fno-pie -c retro.c
+	nasm -f elf64 obsd64.s
+	ld -fno-pie -e _start -static obsd64.o retro.o -o bin/rf.bsd64
+
 linux:
 	cc -m32 -c retro.c
 	nasm -f elf linux.s