Rich Alderson wrote: > From: Chuck Guzis > Sent: Monday, December 05, 2016 6:15 PM >> I've seen PDP-10 9-track tapes done two ways--one character per frame >> and then 4 frames (36 bits) with 5 7-bit characters and the sign bit >> left over. > > Neither of those is entirely accurate. 9-track tapes on the PDP-10 > [...]
I know nothing about physical magtapes. I have seen this comment about the MIT ITS machines: > DM had the only 9-track tape drive; the other machines had 7-track > tapes, as befit 36-bit machines. So I suppose many ITS tapes would have stored six frames per word.