The Dragon's Claw
The Dragon's Claw is an extension cartridge for the Dragon by Lucidata.
It features two parallel I/O ports. One with the BBC User Port pinout, and the second one with a Centronics Printer Port pinout.
The cartridge also allows connecting another cartridge like a disk controller, and up to 4 Dragon Claws.
The heart of the Dragon's Claw is the Rockwell 6522 VIA (Versatile Interface Adaptor) chip.
IC Parts Lists
Mk1 Board IC list (with Datasheets)
|6522||Versatile Interface Adaptor||(pdf)|
|74LS30N||8-Input positive-NAND gates||(pdf)|