The Yellowstone Universal Disk Controller for Apple II computers is now back in stock! Thanks for everybody’s patience – manufacturing took much longer than expected.

Yellowstone is a universal disk controller card for Apple II computers. It supports nearly every type of Apple disk drive ever made, including standard 3.5 inch drives, 5.25 inch drives, smart drives like the Unidisk 3.5 and the BMOW Floppy Emu’s smartport hard disk, and even Macintosh 3.5 inch drives. It combines the power of an Apple 3.5 Disk Controller Card, a standard 5.25 inch (Disk II) controller card, the Apple Liron controller, and more, all in a single card.

Features

• Add 3.5 inch drive and Smartport hard disk support to your Apple IIe or II/II+
• Provide more disk connectivity options for your Apple IIgs
• Bring Macintosh 3.5 and naked Apple 3.5 inch drive mechanisms to the Apple II
• Drop-in replacement for an Apple Liron controller card (with optional DB-19F adapter)
• Drop-in replacement for a standard 5.25 inch or Disk II controller card
• Run two drives of different types on twin independent disk connectors
• Disk II controller emulation mode for tricky copy-protected disks
• Works with DOS 3.3, ProDOS, GS/OS, and more
• User-upgradable firmware for future feature enhancements
• 20-pin ribbon cable connectors or optional 19-pin D-SUB connectors

You’ll find the Yellowstone controller here in the BMOW Store. For more details, please see the product description page.