Sharp QT-8D

The Sharp QT - 8D "micro Compet " is a compact desktop computer and is considered the first computer whose logic blocks were performed in LSI technology. Passed earlier electronic calculators still from numerous discrete transistors and diodes and weakly integrated ICs, took over in late 1969 introduced QT - 8D only four developed by Rockwell ICs, each corresponding to about 900 transistors, all essential tasks.

The display of the QT - 8D consists of eight Digitron tubes in which a figure of eight irregularly shaped segments is assembled. The executable arithmetic operations are limited to the four basic arithmetic operations. The keyboard has 15 keys, with the multiplication and division share a button - critical is whether the arithmetic operation with = or - = complete.

The LSI technique allowed over the earlier computing machines not only a strong reduction of the dimensions, but also in power consumption. A logical extension of the QT - 8D was therefore the center published in 1970 QT -8B, instead of the integrated power supply a battery pack with six NiCd cells contained and thus became the first network- independent electronic calculating machine.

Based on the four ICs QT 8D also in 1971 introduced EL -8, which is considered the world's first pocket calculator was created.