Nice unit! Drool. Looks like this is a NRZI triple density tape, so 7970A or B. The later 7970E would have a 1600 PE density switch too. I have an E, but not with the multiple density or 7 track options unfortunately. Thanks for the link to the series overview manual Rich. Marc
Sent from my iPad > On Feb 10, 2016, at 11:40 AM, Rich Alderson <ri...@livingcomputermuseum.org> > wrote: > > From: Christian Corti > Sent: Wednesday, February 10, 2016 2:28 AM > >> On Tue, 9 Feb 2016, Pete Lancashire wrote: > >>> There are a few odd balls in 9-track as well, but the 556 was a typo. > >> Really? > >> I actually *do* have a 9 track tape drive (HP 7970) that has 200/556/800 >> bpi densities: > >> http://computermuseum.informatik.uni-stuttgart.de/pics/hp1000/hp7970_2.jpg > >> And it is a *9* track tape, I know for sure. > > Actually, what you have is a *dual-density* tape drive, an HP7970E. It > will write 9-track tapes at 800bpi, or 7-track tapes at 200, 556, or 800. > > See the manual for the 7970 drive family at > > http://bitsavers.informatik.uni-stuttgart.de/pdf/hp/tape/7970/07970-90885_7970oper_Dec76.pdf > > Rich > > > Rich Alderson > Vintage Computing Sr. Systems Engineer > Living Computer Museum > 2245 1st Avenue S > Seattle, WA 98134 > > mailto:ri...@livingcomputermuseum.org > > http://www.LivingComputerMuseum.org/
