There is a document I made for giving information
about the custom Nintendo PIO chip found in the 
New Famicom (HVC-101). This replace the U3 (139),
and the U7/U8 (368).

Chip Text:

	U3 JIO
	 ___________________
	|   Nintendo        |
	|>  JIO A  BU3270S  |
	|   925  H39        |
	 ŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻ


Pinout:
	        ________
	  GND -|01 \/ 32|- +5v
	   NC -|02    31|- NC
	   M2 -|03    30|- NC
	  A15 -|04    29|- /ROMSEL
	  A14 -|05    28|- /DBE
	  A13 -|06    27|- CS (U1)
	P1-D0 -|07    26|- INV-2I
	P0-D0 -|08    25|- INV-2O
	P1-D1 -|09    24|- D0
	P0-D1 -|10    23|- D1
	P1-D2 -|11    22|- /INP0
	  +5v -|12    21|- /INP1
	P1-D3 -|13    20|- D2
	P1-D4 -|14    19|- D3
	  GND -|15    18|- D4
       INV-1I -|16    17|- INV-1O
	        ŻŻŻŻŻŻŻŻ


*   INV-1I/O (16-17) = Audio Inverter
**  INC-2I/O (25-26) = PA13 Inverter
*** They are three unused pins maybe there are 
    P0-D2,D3,D4 but I don't realy belive that.
    If this chip is also found in the Redesign
    NES, maybe someone can verify this.

Jacques Gagnon
darthcloud(at)gmail.com