68 lines
1.7 KiB
Markdown
68 lines
1.7 KiB
Markdown
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# Keyboard Converter: Consul 262.5 & VDX 52600
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Arduino project for a keyboard converter between a Zbrojovka Consul 262.5 terminal keyboard and a Videoton VDX 52600 terminal.
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## Keyboard: Consul 262.5
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Terminal keyboard from 1980s.
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It uses a DB25 connector with UART TTL data lines, clock line, +5V primary power and -12V auxiliary power.
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## Terminal: VDX 52600
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VT52 termnial with a DIN5 keyboard connector that dones not use the standard AT keyboard protocol.
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## Converter
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Interfaces the keyboard and the terminal, optionally a USB. These modes of operation are supported:
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1. Keyboard and terminal connected: primary standalone mode. Everything is powered from the terminal.
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2. Keyboard and USB connected: USB keyboard mode. Powered from the USB which acts as a HID keyboard.
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3. Terminal and USB connected: Serial keyboard over USB mode. Powered independently. Allows sending keystrokes to the terminal over USB serial.
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## Parts needed
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- Arduino Leonardo
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- Symmetrical boost converter, 5V to +/- 12V
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- Piezo speaker
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- red and green LED + 470 ohm resistors
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- connectors
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- project box
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- (among others)
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## Connections
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*TODO*
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### Terminal DIN5
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Device | Controller | Description
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GND | GND | Ground
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+5V | +5V | Power
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Data | 6 | Keyboard data to terminal
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Status | 7 | Status (LEDs) from terminal
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### Keyboard DB25
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Device | Controller | Description
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GND | GND | Ground
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+5V | +5V | Power
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-12V | -12V | via a symmetrical boost converter
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Serial out | 3 | UART out from keyboard
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Serial in | 4 | UART in to keyboard
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### Box Interface
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Controller | Description
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10 | Offline LED
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9 | Online LED
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8 | Speaker
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