correction old age, arthritic fingers and old age?
On 12/8/2021 2:57 PM, Mike Katz via cctalk wrote:
You are correct, I counted wrong. Can I chalk it up to old date and
bad eyes😁?
On 12/8/2021 1:52 PM, Paul Koning wrote:
No, it's 5 bit tape. 2 data bits, transport sprocket holes, 3 data
bits -- top to bottom on the reader (right side), left to right on
the punch (left side).
DEC PDP-10 systems used six bit code internally but I don't remember
those appearing on punched tape. The punched tape machines I have
seen with 6 channels are typesetting devices, from early tape
operated Linotype machines (1940s vintage) to 1960s or 1970s era
phototypesetters. Those are upper/lower case.
paul
On Dec 8, 2021, at 2:23 PM, Mike Katz <bit...@12bitsbest.com> wrote:
I thought I had recalled that Baudot was 5 bits but the paper tape
is 6 bits across and I don't know of any 6 bit character codes
except for DECs upper case only character set and even their paper
tape had 8 bits so I guessed Baudot.
On 12/8/2021 1:16 PM, Paul Koning wrote:
5 bit; if it really were 6 bits it would typically be typesetting
codes.
That's a relative of the machine used as console terminal on Dutch
Electrologica X8 computers; I recognize the "Iron cross" symbol,
the figures shift character on the D key. But some of the other
function codes have different labels so it isn't actually the same
model.
The description I have says that the X8 console used CCITT-2,
a.k.a., Baudot, code but with the bit order reversed. And also
that it used the all-zeroes code as a printable character rather
than as non-printing fill.
paul
