ملف:HP magnetic card.jpg

الملف الأصلي(2٬100 × 1٬000 بكسل حجم الملف: 805 كيلوبايت، نوع MIME: image/jpeg)

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⧼wm-license-information-description⧽
English: A magnetic storage card (front and backside) for Hewlett-Packard (HP) programmable calculators HP-41, HP-65, HP-67, and HP-97. The arrows with numbers 1 and 2 on the left and right edges indicate that the card may be used in both directions in order to use the full storage capacity - which was, however, very small with only about 500 Bytes or 0.5 Kilobytes (already using both directions). HP invented these cards with the programmable calculator HP-65 in 1974, which was the first of its kind on the market. The necessity of such a storage device - which would be comparable to the later diskette drives or much later USB memory sticks - was that the main memory (RAM) of the calculator was emptied when the device was powered off, hence all program data and application data was lost, unless stored on such a card.
⧼wm-license-information-date⧽ 2018, {{time}} – invalid date format 48 (help)
⧼wm-license-information-source⧽ ⧼Wm-license-own-work⧽
⧼wm-license-information-author⧽ Sciking

قالب:Retouched

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زمن/تاريخصورة مصغرةالأبعادمستخدمتعليق
حالي ★ مراجعة معتمدة
21:52، 12 نوفمبر 2023
تصغير للنسخة بتاريخ 21:52، 12 نوفمبر 20232٬100 × 1٬000 (805 كيلوبايت)Pastakhov (نقاش | مساهمات)Upload https://upload.wikimedia.org/wikipedia/commons/5/5e/HP_magnetic_card.jpg

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