Adding clocking mechanism for serial data transmission

devices/pc8080/machine/README.md

@@ -13,4 +13,4 @@ The following 8080-based machines are currently available:
 * [Space Invaders (1978)](invaders/) (with [Debugger](invaders/debugger/))
 * [DEC VT100 Terminal](vt100/) (with [Debugger](vt100/debugger/))
 
-And check out the [Dual VT100 Terminals](vt100/dual/) for a demo of two PCjs machines communicating over a *virtual* serial connection. 
+Check out the [Dual VT100 Terminals](vt100/dual/) for a demo of two PCjs machines communicating over a *virtual* serial connection. 

devices/pc8080/machine/vt100/README.md

@@ -14,7 +14,8 @@ This is a PCjs work-in-progress emulation of another 8080-based machine: the VT1
 
 Unlike other VT100 emulators, it is not simply an emulation of VT100 protocols.  It is a simulation of the original VT100
 machine, running the [VT100 Firmware](/devices/pc8080/rom/vt100/) inside the [PC8080](/modules/pc8080/) CPU emulator.
-A [Debugger Configuration](/devices/pc8080/machine/vt100/debugger/) is also available.
+
+A [Debugger Configuration](debugger/) is also available, along with a [Dual VT100 Terminals](dual/) demo. 
 
 Admittedly, terminals aren't that useful in isolation, since they're designed to be connected to other (host) machines.
 But once this PCjs VT100 Terminal simulation is fully operational, you can expect to see it used in conjunction with a variety

devices/pc8080/machine/vt100/dual/README.md

@@ -20,6 +20,8 @@ This is a test of two [VT100 Terminals](../) whose serial ports are *virtually*
 terminal should appear on the screen of the second, and vice versa.  Click or tap on the screen of the desired terminal before
 you begin typing.
 
+A [Dual Debugger Configuration](debugger/) is also available.
+
 If either terminal becomes LOCKED, press the SET-UP key (mapped to your F9 function key) twice to unlock it. 
 
 {% include machine.html id="vt100a" %}

devices/pc8080/machine/vt100/dual/debugger/README.md

@@ -0,0 +1,29 @@
+---
+layout: page
+title: Dual VT100 Terminals with Debuggers
+permalink: /devices/pc8080/machine/vt100/dual/debugger/
+machines:
+  - id: vt100a
+    type: pc8080
+    debugger: true
+    autoStart: true
+    messages: serial|mem|port
+    config: /devices/pc8080/machine/vt100/debugger/machine.xml
+    connection: serialPort=vt100b.serialPort
+  - id: vt100b
+    type: pc8080
+    debugger: true
+    autoStart: true
+    messages: serial|mem|port
+    config: /devices/pc8080/machine/vt100/debugger/machine.xml
+    connection: serialPort=vt100a.serialPort
+---
+
+Dual VT100 Terminals with Debuggers
+-----------------------------------
+
+[Dual VT100 Terminals](../) with Debuggers attached.
+
+{% include machine.html id="vt100a" %}
+
+{% include machine.html id="vt100b" %}