Arduino project for a keyboard converter between a Zbrojovka Consul 262.5 terminal keyboard and a Videoton VDX 52600 terminal.
Terminal keyboard from 1980s. It uses a DB25 connector with UART TTL data lines, clock line, +5V primary power and -12V auxiliary power.
VT52 termnial with a DIN5 keyboard connector that dones not use the standard AT keyboard protocol.
Interfaces the keyboard and the terminal, optionally a USB. These modes of operation are supported:
TODO
Device | Controller | Description GND | GND | Ground +5V | +5V | Power Data | 6 | Keyboard data to terminal Status | 7 | Status (LEDs) from terminal
Device | Controller | Description GND | GND | Ground +5V | +5V | Power -12V | -12V | via a symmetrical boost converter Serial out | 3 | UART out from keyboard Serial in | 4 | UART in to keyboard
Controller | Description 10 | Offline LED 9 | Online LED 8 | Speaker