When all pins have been soldered it should look something like the picture below. The ACID can now be inserted and tested (with the cartridge that you took the ACID from perhaps). There is enough room inside the CPC to easily accomodate the PCB, so no modifications to the CPCs case are required.
[[Image:AcidInside4.png|600px|centre]]
If you prefer to make this expansion using a vero board or even just directly wiring the IC Socket to the riser PCB, then these are the connections that need to be made:
{|{{Prettytable|width: 700px; font-size: 2em;}}
|''ACID Pin''||''Cartridge Pin''
|-
|1||B1, A1, A2
|-
|2||B13
|-
|3||B17
|-
|4||NC
|-
|5||B2
|-
|6||A3
|-
|7||B8
|-
|8||B1, A1, A2
|-
|9||A7
|-
|10||A8
|-
|11||A9
|-
|12||A10
|-
|13||B10
|-
|14||B11
|-
|15||B12
|-
|16||A18, B18
|-
|}
The 100nf capacitor should be soldered between pins 1 and 16 of the ACID socket.