diff --git a/Audio & Video.md b/Audio & Video.md
index 801695c..6396eda 100644
--- a/Audio & Video.md	
+++ b/Audio & Video.md	
@@ -4,3 +4,9 @@ include_toc: true
 ---
 
 # Audio & Video
+
+## VERA Video
+
+## VERA Audio
+
+## The Sentinel 65X A/V Port
diff --git a/Clock Port.md b/Clock Port.md
index 07be254..bc5670a 100644
--- a/Clock Port.md	
+++ b/Clock Port.md	
@@ -4,3 +4,5 @@ include_toc: true
 ---
 
 # Clock Port
+
+The Sentinel 65X clock port is a small, 28-pin female pin header on the mainboard, which exposes the system's debug serial line, I2C bus, reset and main interrupt lines, `PHI2` clock signal, and a 64-address memory-mapped I/O region, mapped to memory beginning at `0x00DFC0`. This region of uncommitted expansion is reserved for the use of user-installed clock port accessories.
diff --git a/Controller Ports.md b/Controller Ports.md
index 5e9494c..69371f6 100644
--- a/Controller Ports.md	
+++ b/Controller Ports.md	
@@ -4,3 +4,7 @@ include_toc: true
 ---
 
 # Controller Ports
+
+Sentinel 65X supports up to four SNES-compatible controller ports, read under software control using the integrated GPIO pins on the CPU.
+
+The kernel itself will have, as part of its system timer IRQ, the job of reading in all controllers and storing their state at a known address in memory.