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doc/hardware: Add information about bio2 turntable bypass cable
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doc/hardware/bio2-sub-io-turntable-bypass-cable.md
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doc/hardware/bio2-sub-io-turntable-bypass-cable.md
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# BIO2 sub IO turntable bypass cable
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If you upgraded a C02/IO2 wired cabinet, the turntables are connected to the
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sub IO via a serial line that goes to another sub IO behind the front panel
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next to the 16seg display. This introduces additional latency as the input
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data needs to pass through multiple systems/PCBs until it reaches the game.
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This can be reduced by using a so-called "bypass" cable, that connects the
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turntables directly to the BIO2 sub IO board reducing latency significantly.
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This cable could be ordered with any IIDX upgrade kit including the BIO sub IO
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board but can also be easily created from scratch.
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## Parts
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* Some wires
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* [JST HL](https://jst.de/file/download/219/pitch-3-96-mm-wtw-hl2-pdf) 2x4 pin female connector
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* [JST HVQ](https://jst.de/file/download/637/hvq) 8 pin female connector
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* Matching terminals for the connectors
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## Pinout
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```text
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JST HL 2x4 pin front view connector
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notch at top
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___
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|---------|
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| 1 2 3 4 |
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| 5 6 7 8 |
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|---------|
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```
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```
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JST HVQ 8 pin front view connector
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Numbering on connector matches
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notch at top
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___________________
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-------------------
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|-----------------|
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| 1 2 3 4 5 6 7 8 |
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|-----------------|
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```
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Pins of the two connectors need to be connected like this:
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| JST HL 2x4 pin | JST 8 pin |
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|----------------|-----------|
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| 1 | 1 |
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| 2 | 1 |
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| 3 | 3 |
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| 4 | 2 |
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| 5 | 5 |
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| 6 | 4 |
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| 7 | 8 |
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| 8 | 8 |
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@ -178,6 +178,9 @@ stuck, try a USB <-> COM dongle instead of using one of the COM ports of the
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mainboard.
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# Troubleshooting and FAQ
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## The turntable input feels laggy/delayed with my BIO2 + sub IO
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See the [this readme](hardware/bio2-sub-io-turntable-bypass-cable.md) for
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information about the bypass cable.
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## The game does not run "well" (frame drops, drifting offsync etc)
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This can be related to various issues:
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