An FPGA-based disk controller card for the Apple II family.
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…
I’m happy to report that BMOW’s Yellowstone Universal Disk Controller for Apple II computers is beginning its second production run. I’d long thought that Yellowstone would be a once-and-done project, because a key chip used in its design became unobtainable…
Firmware version 221024 is now available for the Yellowstone Universal Disk Controller for Apple II. This is the first new firmware since Yellowstone was released, and it fixes two unrelated problems with reset handling and with the NMOS version of…
History repeats itself. I’ve been bitten by an obscure Yellowstone bug related to 6502 phantom reads, and it’s exactly the same problem that I struggled with 13 years ago during the design of my BMOW 1 homebrew wire-wrapped CPU. In…
Back in April I wrote about the future of Yellowstone, and due to the global semiconductor shortage, the future was not looking bright. The Lattice FPGA at the heart of Yellowstone was out of stock everywhere, with an estimated factory…
BMOW’s new Yellowstone Universal Disk Controller for Apple II computers has been popular in its first month of release. At the time of its announcement, I warned that parts supply constraints might make this the one and only manufacturing run…
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