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konami/io: Add instructions for C02 adapter cable RJ45 -> DIN8

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[ECO](../software/ECO.md), [FDD](../software/FDD.md), [GLD](../software/GLD.md), [HDD](../software/HDD.md),
[I00](../software/I00.md), [JDJ](../software/JDJ.md), [JDZ](../software/JDZ.md), [KDZ](../software/KDZ.md),
[LDJ (only up to 24 included)](../software/LDJ.md)
## C02/D01 IO RJ45 to DIN8 connector pinout
This was created by using the [BIO2 sub IO board](../io.md#bio2-ldj-sub-io) to connect pre IIDX 25 cabinet
hardware to the [BIO2 IO board](../io.md#bio2). The two connector types from different generation IO boards, RJ45
on the [C02 IO](#c02-io) board and a round DIN8 connector on the [USBIO2](../io.md#usbio2) board are just
different connectors to the same hardware on the BIO2 sub IO board.
Therefore, any C02/D01 wired cabinet can be upgraded to IO2 wiring and vice versa by building
a RJ45 -> DIN8 or DIN8 -> RJ45 adapter cable.
The following connection information was traced on a original Konami BIO2 sub IO board.
RJ45 (female) connector, top view:
```text
plug insert
|
|
v
|-----------|
| Top view |
| |
| Pins |
| 7 5 3 1 |
| 8 6 4 2 |
|-----------|
```
DIN8 (female) connector, top view:
```text
plug insert
|
|
v
|-----------|
| Top view |
| Pins |
| 3 1 2 6 |
| 7 4 5 8 9 |
|-----------|
```
The two connectors are interconnected on the PCB like this:
| RJ45 pins | DIN8 pins |
|-----------|-----------|
| 1 | 1 |
| 2 | 7 |
| 3 | 4 |
| 4 | 6 |
| 5 | 5 |
| 6 | 3 |
| 7 | 2 |
| 8 | 1 |