Elwro 105-LN Calculator

Resources

Wiki
oldcomputer.info
Rafał Bartoszak blog (in Polish)
olek.waw.pl (in Polish)

Documents

Internals

Board

Elwro 105-LN is based on a Mostek MK-5012 integrated calculator chip.

Display

The display are twelve VFD (Vacuum Fluorescent Display) tubes with beautifully arranged eleven cables each tube.

Power Transformer

The mains transformer is Unitra Zatra TS4/6 (primary: 220V, secondary: 28V, 9.5V, 25V, currents: 33mA, 50mA, 90mA).

Keyboard

Dial Switch

Reassembly