24 Mar
2016
24 Mar
'16
8:13 p.m.
On Mar 24, 2016, at 5:40 PM, Jecel Assumpcao Jr.
<jecel at merlintec.com> wrote:
Jon Elson wrote on Thu, 24 Mar 2016 10:34:48 -0500:
Standard half inch tape was around well before that, I don't think anything changed
for some years before. Standard densities are 800, 1600, and 6250 BPI. Hopefully
it's not one of the oddball values that a few benighted manufacturers implemented,
like 3200 BPI.
7 track, as Nico points out, is harder to find. It stayed around longer than the 1960s,
especially on some architectures. For example, around CDC mainframes you're far more
likely to find it than, say, on PDP11s (though DEC did sell 7 track drives for the PDP11).
7-track standard densities are 200, 556, and 800 bpi. There still are people around with
working 7 track drives, so if you have that, there is still an answer, but the number of
them is certainly more limited.
paul
What density and format is this tape? Not all
drives
support all densities.
I actually mentioned this detail to his advisor when they were
discussing this topic after his student's defense, but I don't think he
remembers this information. I am guessing that the tape was recorded
around 1986, so any new density introduced after that (if there were
any) can be ruled out. About the format, I have no idea.