Solder the 30-pin simm ram module pins to Arduino pins like detailed below :


30-pin SIMM Memory Module
Pin #	Name	Signal Description		Arduino Pin
1	VCC	+5 VDC				+5 VCC
2	/CAS	Column Address Strobe		analog pin 0
3	DQ0	Data 0				
4	A0	Address 0	
5	A1	Address 1	
6	DQ1	Data 1	
7	A2	Address 2	
8	A3	Address 3	
9	VSS	Ground				GND
10	DQ2	Data 2	
11	A4	Address 4	
12	A5	Address 5	
13	DQ3	Data 3	
14	A6	Address 6	
15	A7	Address 7	
16	DQ4	Data 4
17	A8	Address 8
18	A9	Address 9
19	A10	Address 10
20	DQ5	Data 5
21	/WE	Write Enable			analog pin 1
22	VSS	Ground				
23	DQ6	Data 6
24	A11	Address 11
25	DQ7	Data 7
26	QP*	Data parity out			
27	/RAS	Row Address Strobe		analog pin 2
28	/CASP*	Parity Column Address Strobe	
29	DP*	Data parity in			
30	VCC	+5 VDC


30-pin SIMM Memory Module		Arduino
Address pin 0 to 5 (A0..A5)		PORTB (digital pin 8..13)
Address pin 6 to 11 (A6..A11)		GND
Data pin 0 to 7 (DQ0..DQ7)		PORTD (digital pin 7..0) (in that order, DQ0-pin7, DQ1-pin6, DQ2-pin5...DQ7-pin0)
The others will be not connected.


This way you will address 6 bits for rows and 6 bits for columns.
Addresses space will be of 64rows x 64columns = 4096 addresses
1 byte each = 4KB of space.

If you need to use more RAM you can solder the 3 analog pins remaining
to simm ram module pins A6, A7 and A8. It will give you 256 KB of RAM space.