Hello Mr. Andreas Krause,

Below is a pin out diagram.
===========================================
name: 43256
function: 256 kbit (32k X 8) SRAM
package: DIP28,28
manufacturer: NEC Japan
+--()--+
A14 | 1 28| VCC
A12 | 2 27| /WE
A7 | 3 26| A13
A6 | 4 25| A8
A5 | 5 24| A9
A4 | 6 23| A11
A3 | 7 22| /OE
A2 | 8 21| A10
A1 | 9 20| /CS
A0 |10 19| D7
D0 |11 18| D6
D1 |12 17| D5
D2 |13 16| D4
GND |14 15| D3
+------+
===========================================
Regards,

Charles Bannister