A vertical blank interrupt (also known as a vertical blanking interrupt, vertical retrace interrupt or abbreviations of these such as VBL or VBI) is a hardware feature found in many older computer systems that generate a video signal. Video display circuits must generate vertical blanking and vertical sync pulses to indicate the start of each field within the video signal.
A vertical blank interrupt (also known as a vertical blanking interrupt, vertical retrace interrupt or abbreviations of these such as VBL or VBI) is a hardware feature found in many older computer systems that generate a video signal. Video display circuits must generate vertical blanking and vertical sync pulses to indicate the start of each field within the video signal.
Source: Wikipedia "Vertical blank interrupt" · CC BY-SA 4.0
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