Monitor Atari SM124 b/n monochrome Atari SM124 High-Resolution Monochrome Monitor (12" 640x400, 13pol DIN) Display Type: Monochrome (Black and White) Screen Size: 12 inches (diagonal) Resolution: 640 × 400 pixels Refresh Rate: 70 Hz Dot Pitch: 0.31 mm Phosphor: P45 (white) Video Bandwidth: 25 MHz Signal Input: Analog RGB with separate sync Contrast Ratio: Typical for the technology of that time, but specific numbers are not well-documented. Brightness: Adjustable via a control knob on the monitor Connectivity: Directly compatible with Atari ST computers via a dedicated monitor port Power Supply: 220V AC (depending on region)