Content deleted Content added
Undid revision 1215464198 by 41.57.95.113 (talk not relevant) |
Carltoncary (talk | contribs) m Modify the error format. |
||
Line 13:
# First generation: Thermionic vacuum tubes. Mid-1940s. IBM pioneered the arrangement of vacuum tubes in pluggable modules. The [[IBM 650]] was a first-generation computer.
# Second generation: Transistors. 1956. The era of miniaturization begins. Transistors are much smaller than vacuum tubes, draw less power, and generate less heat. Discrete transistors are soldered to circuit boards, with interconnections accomplished by stencil-screened conductive patterns on the reverse side. The [[IBM 7090]] was a second-generation computer.
# Third generation: Integrated circuits (silicon chips containing multiple transistors). 1964. A pioneering example is the ACPX module used in the IBM 360/91, which, by stacking layers of silicon over a ceramic substrate, accommodated over 20 transistors per chip; the chips could be packed together onto a circuit board to achieve unprecedented logic densities. The IBM 360/91 was a hybrid second
Omitted from this taxonomy is the "zeroth-generation" computer based on metal gears (such as the [[IBM 407]]) or mechanical relays (such as the Mark I), and the post-third-generation computers based on Very Large Scale Integrated ([[VLSI]]) circuits.
| |||