Code:
Pin No. Symbol Level Description
1 FG - Frame ground ( Connected to bezel )
2 Vss - GND
3 Vdd - Power supply ( +5 V )
4 Vo - Power supply for LCD driver
5 /WR L Data write. Write data into T6963C when WR = L
6 /RD L Data read. Read data from T6963C when RD = L
7 /CE L L : Chip enable
8 C/D H / L WR=L , C/D=H : Command Write C/D=L: Data write RD=L , C/D=H : Status Read C/D=L: Data read
9 Vee - Negative voltage –10V output
10 /RESET H / L H : Normal ; L : Initialize T6963C
11 DB0 H / L Data bus line
12 DB1 H / L Data bus line
13 DB2 H / L Data bus line
14 DB3 H / L Data bus line
15 DB4 H / L Data bus line
16 DB5 H / L Data bus line
17 DB6 H / L Data bus line
18 DB7 H / L Data bus line
19 FS H / L Pins for selection of font; H : 6 * 8 , L : 8 * 8
20 N.C - No connection
This seems to match the pinout here
http://www.skippari.net/lcd/t6963c_schem.html except that this Winstar display has negative voltage output in pin 9 so there's no need for external negative voltage.
You can look into this pdf that Cryofast showed to see how to connect the 10K potentiometer to adjust the contrast.
http://www.turbokeu.com/mycomputer/glcd/glcd.pdf