7 Sep
2016
7 Sep
'16
11:46 a.m.
On Sep 7, 2016, at 2:45 PM, Al Kossow <aek at
bitsavers.org> wrote:
On 9/7/16 11:21 AM, Paul Koning wrote:
TPI, as in "transitions per inch"?
I vaguely remember that the 1311 (20 sectors of 200 digits each per track) used silvery
colored heads. I wonder if those are the same. They were pretty sturdy; one day when we
had a hydraulic leak, the FE just cleaned heads and pack with isopropyl alcohol, fixed the
leak, and put the drive and pack back into service.
paul
That would fit the IBM 2315 if indeed it used one
sector notch for each sector (it has 8 per track).
and 100 TPI
Original Diablo drives were also 100 TPI, and used silver colored heads, moving to 200
TPI and the more
common white ceramic heads.
Apparently, the 100 TPI Diablo heads are extremely difficult to find today. I remember
all the 100 TPI
Diablo drives at a friend's company getting converted to 200.