diff --git a/hardware/cables/README.md b/hardware/cables/README.md
new file mode 100644
index 0000000..57d9d5f
--- /dev/null
+++ b/hardware/cables/README.md
@@ -0,0 +1,20 @@
+# Cubo Libre Cables
+
+* RF secure keyboard cable.
+
+* RF secure mouse cable.
+
+* RF secure video cable.
+
+* RF secure power cable.
+
+* RF secure GPS cable.
+
+* RF secure microphone cable.
+
+* RF secure speaker cable.
+
+* RF secure misc cabling (e.g. USB webcam).
+
+* Hardware cut off of cables.
+
diff --git a/hardware/clock/README.md b/hardware/clock/README.md
new file mode 100644
index 0000000..fbd6341
--- /dev/null
+++ b/hardware/clock/README.md
@@ -0,0 +1,57 @@
+# Cubo Libre Clock
+
+Time source will come from Internet NTP and external GPS antenna for
+confirmation. Other external time sources will be considered.
+
+## Precision Time Protocol (PTP)
+
+Use precision time protocol within the cluster.
+
+* Mellanox SN2100 / SN2700 (Spectrum silicon) switches with MLNX-OS/ONYX (in GA since 3.6.5011) for PTP IEEE-1588 (SMPTE ST2059-2 profile)[41] or with Cumulus Linux (from version 3.6) with the ptp4l Linux package.[42]
+
+## Network Time Protocol (NTP)
+
+Network Time Protocol is used for time sync from the Internet.
+
+* Run time server on cluster firewall.
+
+## GPS
+
+* External GPS with serial connection to cluster firewall.
+
+## WWVB
+
+* WWVB 
+https://en.wikipedia.org/wiki/WWVB
+303-499-7111
+https://www.nist.gov/time-distribution/radio-station-wwvb
+https://github.com/TaaviE/radioclkd2
+
+BPSK new signal on WWVB since 2012 (?)
+http://everset-tech.com/signal/
+http://everset-tech.com/wp-content/uploads/2014/11/CMOSBPSKReceiver.pdf
+
+
+## CDMA
+
+* CDMA time server
+  http://beaglesoft.com/celsynhome.htm
+  Garmin CDMA35
+  Multitech CDMA
+
+## ACTS
+
+* The NIST transmits in its own standard Automated Computer Timer Service (ACTS). It is contacted via TCP/IP on port 13
+
+
+## Misc
+
+* Explore SDR/FPGA possibilities.
+
+* Very particular about very good computer time:
+"The International Occultation Timing Association"
+http://www.lunar-occultations.com/iota/iotandx.htm
+http://beaglesoft.com/radsynreceiver.htm
+
+* IRIG-B
+
diff --git a/hardware/cubolibre-bom.ods b/hardware/cubolibre-bom.ods
index 10e4ca4..88bb7e1 100644
Binary files a/hardware/cubolibre-bom.ods and b/hardware/cubolibre-bom.ods differ
diff --git a/hardware/keyboard/README.md b/hardware/keyboard/README.md
new file mode 100644
index 0000000..e69de29
diff --git a/hardware/monitor/README.md b/hardware/monitor/README.md
new file mode 100644
index 0000000..a5bd9ec
--- /dev/null
+++ b/hardware/monitor/README.md
@@ -0,0 +1,16 @@
+# Cubo Libre Monitor
+
+* XXX Not libre hardware XXX
+
+* RF/EMI secure monitor.
+
+* 1920 x 1080 pixels.
+
+* Secure cables.
+
+* No microphone.
+
+* No speakers.
+
+* Make sure GPDI behaves.
+
diff --git a/hardware/mouse/README.md b/hardware/mouse/README.md
new file mode 100644
index 0000000..e69de29
diff --git a/hardware/network/README.md b/hardware/network/README.md
index e69de29..a76ae94 100644
--- a/hardware/network/README.md
+++ b/hardware/network/README.md
@@ -0,0 +1,15 @@
+# Cubo Libre Network
+
+The Cubo Libre mini-cluster will have a simple network design.
+
+* Each motherboard has one 1 gig copper ethernet port.
+
+* Each motherboard plugs into copper ethernet switch.
+
+* Firewall has only external network connection, using 10G fiber.
+
+* RF from internal copper network communication will be contained in the cabinet.
+
+* Network switch will likely be non-free hardware with ARM processor
+running free software.
+
diff --git a/hardware/random/README.md b/hardware/random/README.md
new file mode 100644
index 0000000..5accbf3
--- /dev/null
+++ b/hardware/random/README.md
@@ -0,0 +1,7 @@
+# Cubo Libre Hardware Random Numbers
+
+How random numbers are generated on Cubo Libre.
+
+## Entropy
+
+Entropy sources.
diff --git a/hardware/usb/README.md b/hardware/usb/README.md
new file mode 100644
index 0000000..df4437e
--- /dev/null
+++ b/hardware/usb/README.md
@@ -0,0 +1,23 @@
+# Cubo Libre USB
+
+## Hardware Firewall
+
+See:
+
+* https://code.forksand.com/forksand/usb-firewall
+
+* Provide mechanical port blockers for unused ports.
+
+* Device only pass certain USB IDs, HID, etc.
+
+## Authentication
+
+* Nitrokey
+https://www.nitrokey.com/
+
+* Yubi.
+
+* Purism key.
+
+* Ledger.
+
diff --git a/hardware/video/README.md b/hardware/video/README.md
new file mode 100644
index 0000000..4e7b65c
--- /dev/null
+++ b/hardware/video/README.md
@@ -0,0 +1,14 @@
+# Cubo Libre Video
+
+* XXX Not libre hardware XXX
+
+* Radeon RX550.
+
+* GPDI (HDMI) video out.
+
+* DVI video out.
+
+* DP video out.
+
+* Confirm libre stack.
+
diff --git a/software/apps/README.md b/software/apps/README.md
index e69de29..f578957 100644
--- a/software/apps/README.md
+++ b/software/apps/README.md
@@ -0,0 +1,11 @@
+# Cubo Libre Applications
+
+Secure applications.
+
+* User applications will run on the Debian GNU/Linux operating
+system GUI and compute nodes.
+
+* Application load processing will be spread out in the cluster.
+
+* Possibly pre-seed with requested blockchains.
+
diff --git a/software/os/README.md b/software/os/README.md
index e69de29..1397e8c 100644
--- a/software/os/README.md
+++ b/software/os/README.md
@@ -0,0 +1,33 @@
+# Cubo Libre Operating Systems
+The main operating systems for the Cubo Libre mini-cluster
+are Debian and OpenBSD. Debian is used for compute and
+GUI nodes. OpenBSD is used for the firewall.
+
+## Debian
+Debian has a well advanced port of 64-bit RISC-V already.
+
+* https://www.debian.org
+
+## OpenBSD
+OpenBSD is known for being "the most" secure.
+It will be used for the firewall.
+
+* https://www.openbsd.org
+
+* All network traffic in and out of the cluster passes through
+the firewall.
+
+* Time source.
+Network Time Protocol (NTP) and/or
+Precision Time Protocol (PTP) server.
+
+* Random number generation seeds.
+
+* PF firewall.
+
+* Openbsd-current.
+
+* Proxy all traffic to external data center.
+
+* Generate entropy for other systems.
+