- Timestamp:
- Jul 9, 2009, 7:16:28 PM (15 years ago)
- Location:
- en
- Files:
-
- 2 edited
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en/computer/electron-tubes.shtm
r15 r95 31 31 development of broadcast engineering in the 1920/30s. 32 32 <br/>The first electronic desk calculator in the world (1962) is a real milestone. The 33 modern-looking monster features 1 90electron tubes and belongs consequently to the first33 modern-looking monster features 144 electron tubes and belongs consequently to the first 34 34 generation of calculators. It has a wonderful glowing display. However, the 35 35 tube based computer can only compute with the four basic arithmetic operations and -
en/devices/anita.shtm
r31 r95 49 49 <p> 50 50 The upper circuit board contains a ring counter. The gas-filled thyratrons are very small. This 51 was the only way to place approx. 1 90pices into a manageable case. These relay tubes51 was the only way to place approx. 144 pices into a manageable case. These relay tubes 52 52 have only two states like mechanical relays. 53 53 Additionally there are 11 vacuum tubes (ECC 82, left side) built into the calculator.
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