- Not connected (polarising pin)
- Floppy LED (active low)
- +5V power to keyboard
- Serial data from the keyboard (7812.5 baud, 8N1)
- Serial data to the keyboard
- Reset (active low)
Atari 800XL PC,
See also a whole Intel i7 based PC installed in an Atari ST, using this adapter.
The current builds of these are a little tidied up over the original, the wires are now on the back of the board.
USB Keyboard Controller Kits are available from my Sell My Retro store: