Fix description of pin usage

converter/pc98_usb/README

@@ -20,7 +20,7 @@ Wiring: You can change this with editing config.h.
 
     Pin mini DIN        MCU
     ----------------------------------
-    1  ~RST             PD1
+    1  ~RST(TXD)        PD3
     2   GND             GND
     3  ~RDY             PD4
     4   RXD             PD2
@@ -37,9 +37,6 @@ Protocol
 Signal: Asynchronous, Positive logic, 19200baud, Least bit first
 Frame format: 1-Start bit(Lo), 8-Data bits, Odd-Parity, 1-Stop bit
 
-This converter uses software method for testing purpose. AVR UART engine will work better.
-
-
 
 
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