1. JP4    U1 Port A       JP3     U1 Port B

2. JP7    U2 Port A        JP8    U2 Port B

3. JP2    U3 Port A       JP1     U3 Port B

4. JP5    U4 Port A        JP6    U4 Port B

5. JP11  U5 Port A       JP12    U5 Port B

6. JP13   U6 Port A       JP14   U6 Port B

7. JP16   U7 Port A       JP15   U7 Port B

8. JP10   U8 Port A       JP9     U8 Port B

9. U1 (000)  23s17 -1  Port A,B    U2 (001)   23s17-2 Port A,B

10. U3 (010)  23s17 -3  Port A,B    U4 (011)   23s17-4 Port A,B

11. U5 (100)  23s17 -1  Port A,B    U6 (101)   23s17-2 Port A,B

12. U7 (110)  23s17 -3  Port A,B    U8 (111)   23s17-4 Port A,B       

 23s17-8 - 128 GPIO board plug in Raspberry Pi Model A/B

 23s17-8 - 128 GPIO board plug in Raspberry Pi Model B+/B2 /B3

new output test program    23s17-8port-s-v103.py  demo

Scratch software support  

 U1 to U4 spi 23s17 address 40,42,44,46
 U5 to U8 spi 23s17 address 48,4a,4c,4e
 
 40 --> 1    42 --> 2    44 --> 3     46 --> 4
 48 --> 5    4a --> 6    4c --> 7     4e --> 8
 
 Command "sp"+ "address(1-8)" + "a" +"bit(1 to 8)" for Port A
 Command "sp"+ "address(1-8)" + "b" +"bit(1 to 8)" for Port B
 Command "bits"+ "address(1-8)" + "a" +"bit(8 to 1)" for Port A
 Command "bits"+ "address(1-8)" + "b" +"bit(8 to 1)" for Port B

 sp5b7 --> spi address 5 Port B bit 7 ON/OFF
 sp7b4 --> spi address 7 Port B bit 4 ON/OFF
 bits2b01010101 --> address 2 port B from bit 8 to 11
 output --> 01010101
 bits8a01010101 --> address 8 port A from bit 8 to 1
 output --> 01010101
 bits2aoff --> address 2 Port A all OFF/clear