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ITA-2 ASCII
Universal paper tape rader/puncher
- this page is a stub
N-4000 is a paper tape puncher, with an optional
tape reader, manufactured in the late 1980s by Facit in Sundyberg (Sweden),
shortly before the company was liquidated. The device was intended for the
last generation of teleprinters (telex)
as well as for the legacy CNC and CAD/CAM market.
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The N4000 was available in two versions: as a standalone tape puncher,
and as a combined puncher/reader.
In the latter case, an industry-standard optical paper
tape reader was mounted at the front. Both reader and puncher can handle 5,
6, 7 or 8 level 1 tapes. It can punch at 30, 62 or 75 characters per second
and read tapes at a speed of 200 or 500 characters per second [A].
The device can be connected to the standard RS-232 port of a
personal computer (PC). This port is also known as a
CCITT V.24 interface or the
COM-port.
The device has an internal 9kB buffer.
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The N-4000 has two V.24 ports can be used independently.
The image above shows a typical Facit N4000 unit, with the optional reader
fitted at the front. It was used by the Dutch Armed forces for the creation
and duplication of key tapes for devices like the
Philips Aroflex.
The device can be controlled from the connected computer using DC1-DC4
codes, but can also be used in transparent mode so that the codes do not
affect the output. It can also use the ASCII data format to punch 5-track
tapes in ITA-2 telex format, in various national dialects.
All configuration is done directly on the device, using its keyboard
and a 4-digit LED display.
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In telegraphy, each character is represented by a column of holes, punched
in a tape. The holes are known as channels, tracks, levels or bits.
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The device has two RS232 serial ports,
also known as V.24,
available at two DB25/F connectors at the rear, wired as DTE.
Looking from the rear, the leftmost connector
is for channel 1, the other one is called channel 2. Both channels have the
same function, but when controlled from the keypad on the device, channel 1
is used. When controlled remotely (via channel 1 or 2), the
corresponding
interface is used for the reply. Below is the pinout when looking into the receptacle.
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| 1. | GND | Protective ground (shield) |
| 2. | TXD | Transmit data (out) |
| 3. | RXD | Receive data (in) |
| 4. | RTS | Request to Send (out) |
| 5. | CTS | Clear To Send (in) |
| 7. | GND | Signal ground |
| 19. | BFE | Buffer Full/Empty |
| 20. | DTR | Data Terminal Ready |
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Device Tape reader/puncher Purpose Creating, reading and duplicating punched tape Model N-4000 Manufacturer Facit Country Sweden Year 1988 Format ITA-2 (Baudot), ITA-5 (ASCII) Tape 5, 6, 7 or 8 track Speed Punching: 30, 62, 75 c/s, reading: 200, 500 c/s Interface 2 × RS232C (DB25/F) Power 110, 220, 240V AC Dimensions ? Weight ?
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© Crypto Museum. Created: Wednesday 20 May 2015. Last changed: Tuesday, 07 January 2025 - 10:27 CET.
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