The manual did confirm WD is definitely HVD which explains my issues.
I recall some sort of Ultra bit in it as well.
Sent from my iPhone
On Apr 18, 2015, at 02:55, Eric Smith <spacewar at
gmail.com> wrote:
My memory is probably faulty about exactly what the WD suffix means. I
still think it's 16-bit "ultra" (1), but Wikipedia says that ultra (1)
is single-ended or HVD, ultra 2 is LVD or HVD, and ultra 3, 320, and
640 are LVD only.