7 May
2016
7 May
'16
10:17 p.m.
On Sat, May 7, 2016 at 1:19 PM, Seth Morabito <lists at loomcom.com> wrote:
I have reason to believe that the CDC 9428 and 9429
are identical
except that the 9429 is jumpered for 80 tracks and the 9428 is
jumpered for 40 tracks... but I'm not 100% sure.
They would have to have different heads, if the 40 track model was
standards-compliant and industry-compatible. A head suitable for
80-track use doesn't write a wide enough track to reliably write to a
40-track disk that has been written with a normal head. It's likely
that the electronics is identical other than the jumper, and possibly
the values of some passives.