3 Jun
2019
3 Jun
'19
7:48 a.m.
On 6/2/19 10:58 PM, Chuck Guzis via cctalk wrote:
I had a look at a couple of additional reels of Audio
Devices tape from
1965 and 1966. Both were darker and labeled with an "Certified for 800
bpi" sticker and well as a "Heavy Duty Made with 1.5 mil DuPont Mylar".
I'm concluding that the tape in question is pretty darned old.
I think so too.
I uploaded the specification for IBM's 200bpi tape from 1960.
http://bitsavers.org/pdf/ibm/magtape/IBM_Magnetic_Tape_Specifications_200BP…
Coercivity is specified as no more than 280 oersteds.
