![Very Happy :D](./images/smilies/icon_e_biggrin.gif)
![Image](http://24.media.tumblr.com/c7b71076be60bfe885bcb6a32b10c962/tumblr_mn5lxiYsPC1sryg4jo1_500.jpg)
This is a latched input/output cartridge that offers 8 digital outputs (selectable between 5v and 3v3 operation) and 8 digital inputs. Writing/POKEing a byte to 0xFF40-0xFF5F causes the latches to mirror that value on the output headers until you send a new value or the Dragon is turned off. Reading/PEEKing 0xFF40-0xFF5F latches the state of the digital inputs and gives you a byte with each bit representing a pin. Though to be honest, the main reason for latching input was just to get a cheap, easy way of tri-stating the data lines.
Wish I'd found different headers though, the ones I've got require a fair bit of force to insert a wire... I suppose the fact that they hold the wire in pretty securely could be considered handy though.
And damn those resistors are ugly.
![Sad :(](./images/smilies/icon_e_sad.gif)
Anyway, just thought I'd post since I don't know anyone else who'd be remotely interested in any of this.