Unterschiede
Hier werden die Unterschiede zwischen zwei Versionen gezeigt.
Beide Seiten der vorigen Revision Vorhergehende Überarbeitung | |||
analyticalengine:retaingreadcell [2015-11-23 15:37] rainer send complement to subtract, changed layout |
analyticalengine:retaingreadcell [2015-11-29 09:55] (aktuell) rainer [Memory Cell with Reataining Readout] Picture added |
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====== Memory Cell with Reataining Readout ====== | ====== Memory Cell with Reataining Readout ====== | ||
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+ | {{ :analyticalengine:merac-model_151129.jpg?direct&300|}} | ||
Babbage's memory cell in the storage used a reduction-to-zero technique, so it was necessary to restore the values for a retaining read. | Babbage's memory cell in the storage used a reduction-to-zero technique, so it was necessary to restore the values for a retaining read. | ||
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Note that the erasing readout is necessary too, or any other means to zero a storage cell, as writing adds digitwise, so the receiving cell must be zeroed, | Note that the erasing readout is necessary too, or any other means to zero a storage cell, as writing adds digitwise, so the receiving cell must be zeroed, | ||
see my paper on [[lovelace_noteg_paper]]. | see my paper on [[lovelace_noteg_paper]]. | ||
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+ | The picture shows a working physical model of two cells: | ||
===== Arrangement ===== | ===== Arrangement ===== |