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Coordinated Video Timings (CVT; VESA-2013-3 v1.2 [1]) is a standard by VESA which defines the timings of the component video signal.Initially intended for use by computer monitors and video cards, the standard made its way into consumer televisions.
Blank Mode lines cannot be contained within a scrolling region, because Blank Mode line instructions inherently do not have Fine Scrolling Modifier bits. However, a Blank Mode instruction can be used to end a vertical scrolling region and is still subject to the expected scan line height changes per the vertical scroll value.
The user could "switch in" four lines of text in the Hi-Res mode, just like in Lo-Res mode; however, this hid the bottom 32 lines, resulting in a 280 × 160 picture. The ROM routines could still modify the bottom, even though it was hidden. The Apple II's Hi-Res mode was peculiar even by the standards of the day.
1135×624 4fsc decoded frame (Luma) from a Composite 4fsc decode of a LaserDisc via ld-decode.. In a raster scan display, the vertical blanking interval (VBI), also known as the vertical interval or VBLANK, is the time between the end of the final visible line of a frame or field [1] [2] and the beginning of the first visible line of the next frame or field.
Scan lines are important in representations of image data, because many image file formats have special rules for data at the end of a scan line. For example, there may be a rule that each scan line starts on a particular boundary (such as a byte or word; see for example BMP file format). This means that even otherwise compatible raster data ...
This part of the line display process is the Horizontal Blank. [1] [2] In detail, the Horizontal blanking interval consists of: front porch – blank while still moving right, past the end of the scanline, sync pulse – blank while rapidly moving left; in terms of amplitude, "blacker than black".
ZX Spectrum outputs one video line in exactly 224 CPU clock cycles, where the CPU clock rate equals 3.5 MHz. This exactly matches the PAL standard 64 μs line time. However, the ZX Spectrum produces only 312 lines to form one display frame, while the 625-line PAL standard recommends 312.5 lines. As a consequence, the frame rate of the ZX ...
512 to 600 lines at reduced vertical refresh rates (down to 50 Hz, and including e.g. 528, 544, 552, 560, 576-line), depending on individual monitor compatibility. For example, high resolution modes with square pixels are available at 768 × 576 or 704 × 528 in 16 colors, or medium-low resolution at 320 × 240 with 256 colors.