Atari SIO plug with FTDI PCB
thingiverse
I made some minor adjustments to <A href="https://www.thingiverse.com/thing:1831769">Atari SIO plug</A> so it would fit perfectly with the FT232RL USB to serial board from <A href="https://www.ebay.com/itm/310510484589">ebay</A>. The board measures 26x16mm without a pin header. I used 3.96mm pitch contacts in the Atari plug, such as those found on <A href="https://www.gme.sk/kontakt-pff04-01ft">this example</A>. To connect the PCB, first remove the pin header and solder a jumper to 5V on the bottom side of the board. Next, hook up:\r\nSIO 3 (Data In) -> TXD (via Schottky diode from Atari --|>I-- TXD)\r\nSIO 4 (Ground) -> GND\r\nSIO 5 (Data Out) -> RXD\r\nSIO 7 (CMD) -> CTS\r\nYou can skip the diode if you won't be using the adapter in SIO daisy-chain mode. Consider using transparent filament to see the RX/TX activity diodes on the PCB.
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