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In page Hercules Graphics Card:
"The video output is 5 V TTL, as with the MDA card.[2][3][4] Nominally, the Hercules card provides a horizontal scanning frequency of 18.425 ± 0.500 kHz and 50 Hz vertical.[5] It runs at two slightly different sets of frequencies depending on whether in text or graphics mode, providing a different vertical refresh rate and a different aspect ratio via a different pixel clock and number of scanlines.[citation needed]
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