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Trammell Hudson  committed d74d67c

document wiring

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  * y becomes q or x
  * r becomes g (rarely)
  * cvcvcvcvcvcvcvcvcvcvcvcvcvcv
- * 
  *
  * At 2 MHz the 45.45 baud (22ms) can be generated with the clock.
+ *
+ * The KSR models use the 5-bit UART as well, but require a current loop
+ * to generate the signal.  To wire this I used a 470 Ohm resistor:
+ *
+ *  TX+ --------------- Vcc (+5V)
+ *  TX- -----+--------- PD2 (uart rx)
+ *           |
+ *           +-/\/\/\-- GND
+ *             470 Ohms
+ *
+ * Since there are two separate current loops, this makes the KSR
+ * capable of full duplex operation.
  */
 
 #undef F_CPU