https://www.segasaturno.com/portal/viewtopic.php?f=19&t=8503&p=102908#p102908
-----------------------------------
Nextmare
19 Enero 2018, 08:57 PM

Re: Listado de juegos PAL con selector de Hz (Remake)
-----------------------------------
[quote user="Ryo Suzuki" post="102906"]Es seguro. VGA no puede ponerlo a 50hz. Me lo explicaron técnicamente pero no me acuerdo bien...[/quote]
Ryo tiene razón y es un dato técnico muy importante, pues nos facilita mucho la investigación de los juegos que se fuerzan a 60Hz al conectarlos por VGA (dato que desconocia completamente). 

Podéis ver la información aquí: [url=https://en.wikipedia.org/wiki/Video_Graphics_Array]https://en.wikipedia.org/wiki/Video_Graphics_Array

Por lo que se explica en Wikipedia, VGA en si sí es compatible con 50Hz, pero solo en ciertas resoluciones y concretamente en la resolución utilizada por Dreamcast 620x480 pixels progresivos (HDTV) se utilizan 60Hz. EDIT: técnicamente si es posible hacer 480p a 50Hz pero no tiene sentido hacerlo, pues la imagen funciona mejor a 60Hz y este tipo de pantallas no tienen la limitación de 50Hz que sí tenian algunas TVs de tubo. 

[quote user="Wikipedia" post=""][b]Higher-resolution and other display modes[/b]

Higher-resolution and other display modes are also achievable, even with standard cards and most standard monitors – on the whole, a typical VGA system can produce displays with any combination of:

    512 to 800 pixels wide, in 16 colors (including 640, 704, 720, 736, 768...), or
    256 to 400 pixels wide, in 256 colors (including 320, 360, 384...)

with heights of:

    200, or 350 to 410 lines (including 400-line) at 70 Hz refresh rate, or
[color=#00ff00]    224 to 256, or 448 to 512 lines (including 240 or 480-line) at 60 Hz refresh rate[/color]
    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.

(175 to 205 line modes may be possible at 70 Hz, and 256 to 300 lines in the 50 to 60 Hz refresh rate range, as well as horizontal widths below 256/512, but these are of little practical use)

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; alternatively, extended resolution is available with "fat" pixels and 256 colors using, e.g. 400×600 (50 Hz) or 360×480 (60 Hz), and "thin" pixels, 16 colors and the 70 Hz refresh rate with e.g. 736×410 mode.

"Narrow" modes such as 256×224 tend to preserve the same pixel ratio as in e.g. 320×240 mode unless the monitor is adjusted to stretch the image out to fill the screen, as they are derived simply by masking down the wider mode instead of altering pixel or line timings, but can be useful for reducing memory requirements and pixel addressing calculations for arcade game conversions or console emulators.[/quote]

Actualizado listado.


