A follow-up to the FPGA-based disk controller for Apple II post, Steve writes:
After a month of inactivity, I finally returned to my unfinished Yellowstone disk controller project to investigate the JTAG programming problems. Yellowstone is an FPGA-based disk controller card for the Apple II family, that aims to emulate a Liron disk controller or other models of vintage disk controller. It’s still a work in progress.
Last month I discovered some JTAG problems. With the Yellowstone card naked on my desk, and powered from an external 5V supply, JTAG programming works fine.
More details at Big Mess o’ Wires.
from Dangerous Prototypes http://ift.tt/2DDUqiz