preliminary version 5.3:
- TOSLink has been replaced by LED on the back of phone jack. Similar solution used in some notebooks. So, to plug TOSLink cable, you just need to use 3.5mm adapter - it's pretty common. This is cheaper solution and doesn't need another hole - so pretty much fits into MiSTer philosophy
- Added serial connection. Actually it's naked FPGA GPIOs. I've just added some standardization for small extensions like serial port. I've used USB3.0 connector as an easier solution. Originally i've planned to use 4x2 header, but it's not convenient and it's easy to shift the connection and fry something. USB plug gives solid connection avoiding any misalignment. But it's not USB of course. Just plug. I've used GND and 5V as on real USB. Other signals also should be ok in case if someone will plug a real USB device into this socket. Socket provides RX,TX,RTS,CTS,DTR,DSR signals but actually it's up to core.
- I2S header in case if someone wants. It's mutually exclusive to analog and TOSLink output.
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