9 Jun
2023
9 Jun
'23
1:50 p.m.
On Jun 9, 2023, at 7:06 AM, Christian Corti via cctalk
<cctalk(a)classiccmp.org> wrote:
On Thu, 8 Jun 2023, Adrian Godwin wrote:
That may be true for some of them. But typesetting usage has 6 channels on tape sized to
carry just 6. For example, the Linotype "Teletypesetter" handbook clearly shows
paper tape with 6 channels (3 on each side of the feed holes) filling the tape.
(https://archive.org/details/LinotypeHandbookForTeletypesetterOperation1951 and
https://www.galleyrack.com/images/artifice/letters/press/compline/literatur…)
I saw a specification of paper tape widths a while back, which is how I discovered there
is such a thing as 7 channel tape, but I can't find it right now.
paul
Getting tape made to order might come in handy if
you want odd sizes. 5 and 8 channel tape is fairly common, but there was also 6 and 7
channel tape (in widths specific to those types) which is far less common. I haven't
seen 6 channel tape since the 1970s when it was still used in typesetting equipment, and I
never heard of 7 channel tape until recently (it was used on some 1960s era machines).
6 and 7 channel tapes should be the same width, i.e. 22.2 mm. The LGP-30 for example
natively uses 7 channel tapes (was also common in the former GDR) but punches only 6
channels. 