Still working through my logic to understand why the first sector is written incorrectly I don't have the drive here so I have to be certain I know why the error is occurring and validate the correctness of my solution.
Xerox PARC was ready to toss their collection of spare ICs and other parts, but instead donated them to the Alto restoration effort. I picked up 12 small cabinets filled with various 7400, 9000 and MECL chips, RAM and other parts.
DUMONT OSCILLOSCOPE REPAIR FOR UPCOMING DGM EVENT
Digital Game Museum will display Tennis for Two, possibly the first video game, which displays on an oscilloscope. It was created in 1958 thus we need a period authentic scope for the exhibit. A friend loaned his Dumont 304A scope to the museum, but it was non operational.
I replaced some bad parts and restored it to operation, delivering it to the museum today to allow them to set up their exhibit in advance of the Game Developer Conference at the end of the month.