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Universal paper tape reader/puncher
The GNT-4606 was the last model in a series of flexible paper-tape
reader/punchers from Helioprint (later: Santec) in Denmark. It was the
successor to the GNT-4601 and the GNT-4604 and is suitable for
5, 6, 7 and 8-level paper and maylar tape,
for teleprinters and computers.
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The GNT-4606 can be connected to any personal computer with an RS-232
serial port and can be operated at various speeds and data formats that
are selectable with switches at the front panel and DIP-switches at the bottom.
The machine is ideal for the creation of teleprinter demo-tapes,
for the generation of One-Time Tapes (OTT) for
mixer machines (i.e. tapes with random characters)
and for making key tapes.
The image on the right shows a typical GNT-4606 that we found on Ebay in 2012.
We have adapted this unit for demonstration purposes and are currently
writing suitable software for it.
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The GNT-4606 has been in production for many years and is still available
from a number of suppliers today (2012). It has been (and still is) rather
popular with the users of old CNC-machines. It was also used by governments
for the creation and distribution of crypto keys.
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For the creation of cipher tapes and demonstrations of historical cipher
machines, we are always looking for blank paper tape rolls. Especially
the 1" 8-level tapes are hard to get. They were used in the 1970s and 80s
for storing programs on early computer generations, but have since been
phased out. Until recently they were also popular in the CNC industry.
If you have any surplus rolls, please consider donating them
to Crypto Museum. Your help is much appreciated.
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We are currently in the process of modifying the GNT-4606 for demonstration
purposes. We would like to be able to create 8-level key tapes for various
cipher machines and 5-level tapes for a number
of our mixer machines. For this, we want to
connect the GNT-4606 to a computer (PC).
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First we had to establish a physical connection between the GNT-4606
and our computer. The RS-232 connector at the rear of the puncher is of
the old DB25 standard and suitable cables to the DE9 connector on our PC
were not available.
So we decided to add a DE9 female type socket to the empty space at the rear
of the unit. On older models this space was used for another DB25 socket.
The DE9 connector has been wired in parallel to the existing DB25 socket,
in such a way that we can used a standard DE9 extension cable (male/female)
for connection to our PC.
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Development of the software is currently underway and we hope to be able
to create suitable 5-level and 8-level tapes before long. We will keep you
informed of our progress through this page.
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© Crypto Museum. Created: Tuesday 12 June 2012. Last changed: Tuesday, 14 May 2019 - 08:42 CET.
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