PC-Engine / TurboGrafx-16 Cartridge Pinout

The HuCard on PCe/TG-16 is a 38pos 0.050" pitch custom connector. The HuCard are 0.093" thick. 

This is the pin sequence from left to right for a TG-16, point of view is looking at the HuCard being inserted to a console. For a PCe, simply reverse the data pins (i.e. D0..D7 instead of D7..D0).

 Pin # Description
 1 Card Detect (active-low)
 2 Audio In
 3 Address 19
 4 Address 16
 5 Address 15
 6 Address 12
 7 Address 7
 8 Address 6
 9 Address 5
 10 Address 4
 11 Address 3
 12 Address 2
 13 Address 1
 14 Address 0
 15 Data 7
 16 Data 6
 17 Data 5
 18 GND
 19 Data 4
 20 Data 3
 21 Data 2
 22 Data 1
 23 Data 0
 24 #CE
 25 Address 10
 26 #OE
 27 Address 11
 28 Address 9
 29 Address 8
 30 Address 13
 31 Address 14
 32 Address 17
 33 Address 18
 34 #WR
 35 HSM (High Speed Mode)
 36 #RST
 37 #IRQ2
 38 +5V