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doc/hardware: Add information about bio2 turntable bypass cable

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icex2 2020-12-17 00:52:56 +01:00
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doc/hardware/bio2-sub-io-turntable-bypass-cable.md Normal file
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# BIO2 sub IO turntable bypass cable
If you upgraded a C02/IO2 wired cabinet, the turntables are connected to the
sub IO via a serial line that goes to another sub IO behind the front panel
next to the 16seg display. This introduces additional latency as the input
data needs to pass through multiple systems/PCBs until it reaches the game.
This can be reduced by using a so-called "bypass" cable, that connects the
turntables directly to the BIO2 sub IO board reducing latency significantly.
This cable could be ordered with any IIDX upgrade kit including the BIO sub IO
board but can also be easily created from scratch.
## Parts
* Some wires
* [JST HL](https://jst.de/file/download/219/pitch-3-96-mm-wtw-hl2-pdf) 2x4 pin female connector
* [JST HVQ](https://jst.de/file/download/637/hvq) 8 pin female connector
* Matching terminals for the connectors
## Pinout
```text
JST HL 2x4 pin front view connector
notch at top
___
|---------|
| 1 2 3 4 |
| 5 6 7 8 |
|---------|
```
```
JST HVQ 8 pin front view connector
Numbering on connector matches
notch at top
___________________
-------------------
|-----------------|
| 1 2 3 4 5 6 7 8 |
|-----------------|
```
Pins of the two connectors need to be connected like this:
| JST HL 2x4 pin | JST 8 pin |
|----------------|-----------|
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 2 |
| 5 | 5 |
| 6 | 4 |
| 7 | 8 |
| 8 | 8 |

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doc/iidxhook/iidxhook9.md
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@ -178,6 +178,9 @@ stuck, try a USB <-> COM dongle instead of using one of the COM ports of the
mainboard.
# Troubleshooting and FAQ
## The turntable input feels laggy/delayed with my BIO2 + sub IO
See the [this readme](hardware/bio2-sub-io-turntable-bypass-cable.md) for
information about the bypass cable.
## The game does not run "well" (frame drops, drifting offsync etc)
This can be related to various issues: