Changeset 94 in t29-www
- Timestamp:
- Jul 5, 2009, 2:12:33 AM (15 years ago)
- Location:
- en/computer
- Files:
-
- 2 edited
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en/computer/storage-media.shtm
r31 r94 33 33 <br/>The problem of storing information is of central importance for digital computers and was a difficult area during the early days of computing. In these times building a fast processor was considerably more easy than building an equally fast and large memory system for this processor. This led to some rather arcane solutions which are completely extinct today. 34 34 </p> 35 <p> 36 Nowadays as well as 50 years ago, these characteristical attributes are important: 37 </p> 38 39 <ul> 40 <li>cycle time</li> 41 <li>packing density</li> 42 <li>costs / bit</li> 43 <li>(thermal) power loss</li> 44 </ul> 45 <p>Storages are classified geometrically:</p> 46 <ul> 47 <li>one-dimensional alignment (e.g. the delay line memory)</li> 48 <li>two-dimensional alignment (e.g. drom storage, disk storage)</li> 49 <li>three-dimensional alignment (e.g. core memory, the number of layers is the word length)</li> 50 </ul> 51 <p>These physical principles has been used: electrostatic charge (storage tube), 52 propagation of acoustic waves (delay line memories), ferromagnetism (core memory, 53 plated wire memory, drum/disk memory), holography (optical memories). The most important 54 and most spread memories are the ferromagnetic memories.</p> 35 55 36 56 <div class="box center"> -
en/computer/univac9400.shtm
r56 r94 198 198 UNIVAC 9400 = 470 cars (Volkswagen beatle)</a></p> 199 199 200 <!-- Absatz hinzugekommen zu v5.8... --> 201 <p><small>We would like to thank Dr. Jürgen Steen from the 202 <a href="http://www.historisches-museum.frankfurt.de/">Historical 203 Museum Frankfurt</a> for lending several UNIVAC boards. Reparations 204 are quite difficult without comparative boards.</small></p> 200 <!-- Absatz hinzugekommen/zuletzt geaendert 05.07.09 --> 201 <div class="box right"> 202 <a href="http://www.unisys.com/"><img src="/shared/photos/rechnertechnik/unisys_tag.gif" width="142" height="75" /></a> 203 <p class="bildtext"><small>We would like to thank to the UNISYS 204 Corporation for funding all trucking of the big machines. 205 We would also like to thank Dr. Jürgen Steen from the 206 <a href="http://www.historisches-museum.frankfurt.de/">Historical 207 Museum Frankfurt</a> for lending several UNIVAC boards. Reparations 208 are quite difficult without comparative boards.</small></p> 209 </div> 205 210 206 211
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