Mnemotast telephone dialler with non-volatile memory

telephone dialler with non-volatile memory Mnemotast

Mnemotast

The Mnemotast is a telephone number dialler with non-volatile memory, intended for use with automatic telephone exchanges (ATJ - automaattelefonijaam). According to the original technical description and passport, it could be connected to telephone sets fitted with the Direkt-Mnemo or Direkt 40D devices, as well as to conventional telephone sets with a separate power supply. The manual was issued in Tallinn in 1984 by the Special Design and Technology Enterprise of the Harju Collective Farm Construction Combine (Harju KEK).

The Mnemotast could store up to 32 telephone numbers, each containing up to eight digits. It allowed a previously selected number to be redialled and could retain the stored numbers even during a power failure. The device also allowed numbers of up to 20 digits to be dialled repeatedly.

The front panel contains the subscriber-number keypad, memory and operation keys, and indicator lamps for "Memory" and "Ready". The separate power supply unit is connected to the Mnemotast by a cable, while the telephone line and telephone set are connected to terminals on the rear of the device.

The device's number memory is implemented using four Soviet microchips К561РУ2 (static RAM with 256 1 bit words). The automatic dialler uses two К145ИК8П microchips - one of the first Soviet electronic number dialling ICs. It is manufactured using p-MOS technology and contains 2,770 integrated circuits.

The unit measures 197 × 282 × 60 mm and weighs 2.2 kg. Its power supply measures 165 × 80 × 60 mm and weighs 1.1 kg. The power supply operates from a 220 V, 50 Hz mains supply and consumes approximately 5 VA.

Year of manufacture: 1985

Serial №: 173