74S287 

1024-bit programmable read-only memories
256 4-bit words
3-state outputs
This product has been superceded by the TBP24S10

func pin           pin func
        +---__---+
AD G  1 +        + 16  Vcc 
AD F  2 +        + 15  AD H
AD E  3 +        + 14  *S2
AD D  4 +        + 13  *S1
AD A  5 +        + 12  DO1
AD B  6 +        + 11  DO2
AD C  7 +        + 10  DO3
 GND  8 +        +  9  DO4
        +--------+ 
*) means active low.

reader
bit    addr   data
0       A     DO 1
1       B     DO 2
2       C     DO 3
3       D     DO 4
4       E
5       F
6       G
7       H



74S288

256-bit programmable read-only memories
32 8-bit words
3-state outputs
This product is compatible with the TBP18S030


func pin           pin func
        +---__---+
DO 1  1 +        + 16  Vcc
DO 2  2 +        + 15  *S
DO 3  3 +        + 14  AD E
DO 4  4 +        + 13  AD D
DO 5  5 +        + 12  AD C
DO 6  6 +        + 11  AD B
DO 7  7 +        + 10  AD A
 GND  8 +        +  9  DO 8
        +--------+ 
*) means active low.

reader
bit    addr   data
0      AD A   DO 1 
1      AD B   DO 2
2      AD C   DO 3
3      AD D   DO 4
4      AD E   DO 5
5             DO 6
6             DO 7
7             DO 8