CGA EGA to VGA Industrial Converter — CNC CRT to LCD Signal Guide

Many older CNC CRTs use IBM-compatible CGA (Color Graphics Adapter) or EGA (Enhanced Graphics Adapter) video standards. These signals are not directly compatible with modern VGA LCD displays. An industrial CGA/EGA-to-VGA converter enables you to use a modern LCD while preserving the original display characteristics.

Understanding CGA and EGA Signals

Standard	Resolution	Colors	Connector
CGA	640×200 / 320×200	16	15-pin D-sub or 9-pin D-sub
EGA	640×350	16 (from 64 palette)	9-pin D-sub (DB-9)
VGA	640×480+	256+	15-pin HD-15 (VGA)

KT809 CGA/EGA to VGA Converter

Our KT809 converter supports both CGA (15-pin) and EGA (9-pin) inputs and outputs a standard VGA signal. Key features:

• Automatic CGA/EGA signal detection — no dip switches
• Built-in scan doubling — converts 15.75kHz to 31.5kHz
• Aspect ratio correction (4:3 output)
• Industrial temperature range (-20°C to +70°C)
• Wide input voltage (DC 5V-24V)

Read full KT809 guide →

Compatible CNC Systems

CGA and EGA signals are most commonly found on older CNC systems from:

• FANUC — Series 0 and 0i color CRT displays
• Siemens — SINUMERIK 810/820 color displays
• Heidenhain — TNC series color displays
• Mitsubishi — E60/M50 color CRT systems

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