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analyticalengine:retaingreadcell [2015-11-18 22:55] – necessity on erasing readout raineranalyticalengine:retaingreadcell [2015-11-29 10:55] (aktuell) – [Memory Cell with Reataining Readout] Picture added rainer
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 ====== Memory Cell with Reataining Readout ====== ====== Memory Cell with Reataining Readout ======
 +
 +{{ :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]].
 +
 +The picture shows a working physical model of two cells: 
  
 ===== Arrangement ===== ===== Arrangement =====
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   * the drive axis (back)   * the drive axis (back)
  
-{{ :analyticalengine:merac-3d-neutral.png?488| Fig.1}}+==== Neutral Position ==== 
 + 
 +{{merac-3d-neutral.png?488 | Fig.1}}
  
 Both are horizontally arranged and go from the mill Both are horizontally arranged and go from the mill
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 The shift is common to all digits of a memory cell. The shift is common to all digits of a memory cell.
  
-{{ :analyticalengine:merac-3d-add.png?488| Fig. 2}}+==== Add Position ==== 
 + 
 +{{merac-3d-add.png?488 | Fig. 2}}
  
 In the add position, a pin is engaged with the add gear, In the add position, a pin is engaged with the add gear,
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 it to the current digit position even if the digit axis rotates. it to the current digit position even if the digit axis rotates.
  
-{{ :analyticalengine:merac-3d-send.png?488|}}+==== Send Position ==== 
 + 
 +{{merac-3d-send.png?488 |}}
  
 In the send position, a pin is engaged with the read cam, In the send position, a pin is engaged with the read cam,
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 while inverting their rotation. while inverting their rotation.
  
 +===== Negative Numbers =====
 +
 +By inverting the direction of the driving shaft, the complement of the number will be sent out in reverse direction,
 +resulting in a subtraction, if the carry mechanism is capable to do so.
 +And an extras turn is necessary (details to follow)
  
  
analyticalengine/retaingreadcell.1447883727.txt.gz · Zuletzt geändert: 2015-11-18 22:55 von rainer
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