Glob up, edge connector towards you.  Pins 1-10 on top, left to right.  Pins 11-20 on bottom, pin 11 under pin 10, pin 20 under pin 1.

Dumped as HY27US08121A.

1  VCC (3.3V)    20 cart grounds this to indicate inserted
2  R/B           19 N/C
3  GND           18 /RE
4  /WE           17 ALE
5  GND           16 IO7
6  IO6           15 IO5
7  IO4           14 IO3
8  IO2           13 /CE
9  IO0           12 IO1
10 CLE           11 GND