In the following picture you can see a close-up of the 65C102 co-processor board. The major components are the 65C102 processor, the RAM and ROM and the Tube IC (that controls communication with the host computer):
![](https://www.domesday86.com/wp-content/uploads/2017/01/Acorn-65C102-Second-Processor-board.jpg)
The 65C102 co-processor has a 65SC102 CPU clocked at 4MHz and 64Kbytes of memory.
Schematic diagram
The following images show the schematic diagram for the co-processor board:
![](https://www.domesday86.com/wp-content/uploads/2019/04/Acorn-65C102-Second-Processor_Page_1.png)
![](https://www.domesday86.com/wp-content/uploads/2019/04/Acorn-65C102-Second-Processor_Page_2.png)
![](https://www.domesday86.com/wp-content/uploads/2019/04/Acorn-65C102-Second-Processor_Page_3.png)
![](https://www.domesday86.com/wp-content/uploads/2019/04/Acorn-65C102-Second-Processor_Page_4.png)
![](https://www.domesday86.com/wp-content/uploads/2019/04/Acorn-65C102-Second-Processor_Page_5.png)
PCB images
The following picture shows the top-side of the co-processor's PCB (with the components removed):
![](https://www.domesday86.com/wp-content/uploads/2018/05/Acorn-65C102-PCB-Top.jpg)
The following picture shows the bottom-side of the co-processor's PCB:
![](https://www.domesday86.com/wp-content/uploads/2018/05/Acorn-65C102-PCB-Bottom.jpg)