File:HP magnetic card.jpg
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Summary
| 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. |
| Date | |
| Source | Own work |
| Author | Sciking |
| This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: removed background, horizontal straightening, technical shadow. Modifications made by Auge=mit.
|
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 12:01, 27 October 2020 | 2,100 × 1,000 (805 KB) | Auge=mit | removed background, horizontal straightening, technical shadow | |
| 06:00, 27 October 2020 | 2,182 × 1,023 (1.12 MB) | Wickipädiater | background | ||
| 01:01, 27 October 2020 | 2,069 × 909 (641 KB) | Wickipädiater | +cropped -background | ||
| 14:54, 16 March 2018 | 3,264 × 2,448 (2.27 MB) | Sciking | User created page with UploadWizard |
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