I don't know for sure, but I think, the monitor should make a vertikal frequency down to 15 kHz (normaly monitors never do that, they stop at 32 kHz). This type of monitor was in the past the multisync monitor (don't know if that really helps you out).
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We have an Archimedes 440 at school. The monitor appears stuffed. The picture seems to shear horizontally (if you know what I mean) Does anyone know what type of monitor would suit it these days?