ISO/IEC 3788:1990 PDF

Name: ISO/IEC 3788:1990 — Information processing — 9-track, 12,7 mm (0,5 in) wide magnetic tape for information interchange using phase encoding at 126 ftpmm (3 200 ftpi), 63 cpmm (1 600 cpi)
SKU: ISO/IEC 3788:1990
Price: 25 EUR
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Information processing — 9-track, 12,7 mm (0,5 in) wide magnetic tape for information interchange using phase encoding at 126 ftpmm (3 200 ftpi), 63 cpmm (1 600 cpi)

Название (английский):

ISO/IEC 3788:1990

Information processing — 9-track, 12,7 mm (0,5 in) wide magnetic tape for information interchange using phase encoding at 126 ftpmm (3 200 ftpi), 63 cpmm (1 600 cpi)

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 14
Дата публикации:: 24 июля 1990 г.
Издание:: ISO/IEC IS 3788 edition 2 version 1
ICS:: 35.220.22

Тип поставки:

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Язык документа:

ruen

Срок поставки:3 раб. дн. (перевод)

Цена:210 €

Описание (английский):

Provides a format and recording standard for 9-track, 12,7 (0,5 in) wide magnetic tape and reels to be used for information interchange among information processing systems, communication systems, and associated equipment utilizing the 7-bit coded character set specified in ISO 646 or its 7-bit or 8-bit extensions specified in ISO 2022. References: ISO 962; 1001; 1864.

Abstract

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Overview

ISO/IEC 3788:1990 defines a tape format and recording standard for 9‑track, 12.7 mm (0.5 in) wide magnetic tape intended for information interchange. It specifies the physical layout, recording method (Phase encoding), nominal recording density (126 ftpmm / 3200 ftpi, with reference use at 63 ftpmm / 1600 ftpi), signal amplitude limits, erasure practice and mechanical/operating conditions to ensure reliable data interchange between information‑processing and communication systems.

Key topics and technical requirements

Recording method: Phase encoding (ONE and ZERO represented by flux transition polarity relative to the interblock gap; additional phase flux transitions inserted mid‑bit when required).

Physical format: 9 tracks, track numbering from the reference edge (track 1 at reference edge). Track positions and written track width specified (track centre distances and min. written width 1.09 mm).

Data density & spacing: Nominal physical recording density 126 ftpmm (3200 ftpi); bit flux spacing ~7.935 µm at 126 ftpmm and ~15.87 µm at 63 ftpmm. Long‑term average spacing ±4%; short‑term spacing constraints specified.

Signal amplitude: Use of a Master Standard Reference Tape (NIST SRM 3200) for Standard Reference Amplitude. Interchange tapes must average 65%–150% of reference amplitude at 126 ftpmm; minimum adjacent transition amplitude ≥20% of reference; limits at 63 ftpmm also defined.

Block format: Preamble (40 rows of ZERO + 1 row of ONE), data portion (min 18 rows, max 2048 rows unless agreed otherwise), postamble (1 row ONE + 40 rows ZERO). Identification burst and Tape Mark rules included.

Gaps & tension: Initial gap ≥76 mm; interblock gap nominal 15 mm (min 12.7 mm, max 7600 mm). Wind tension for interchange 2.0 N – 3.6 N.

Environment & handling: Operating temperature 16–32 °C, relative humidity 20–80%, wet bulb ≤25 °C; storage/transport recommendations and conditioning procedures after exposure.

Erasure & residuals: Full‑width d.c. erase direction defined; residual signals must be **

ISO/IEC 3788:1990 PDF

Abstract

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Overview

Key topics and technical requirements

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