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README: DS also uses 15.7 kHz
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@pinobatch
pinobatch committed Jan 26, 2024
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10 changes: 6 additions & 4 deletions gameboy/README.md
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Expand Up @@ -103,13 +103,15 @@ came to be called "240p" video.
Some handhelds drive their internal LCD with System M-like timings.
For example, the Game Gear's display has 144 active lines, which
are centered in the 240p output of EvilTim's [Game Gear RGB] mod.
The Game Boy, on the other hand, uses an incompatibly slower 9.2 kHz
horizontal sync. Super Game Boy has to use a frame buffer to
convert the timing to 240p or 480i, which adds lag. This is why
the Game Boy port is renamed.
The Nintendo DS likewise drives 192 out of 263 lines at 15.7 kHz
according to [timings in GBATEK]. The Game Boy, on the other hand,
uses an incompatibly slower 9.2 kHz horizontal sync. Super Game Boy
has to use a frame buffer to convert the timing to 240p, which adds
lag. This is why the Game Boy port is renamed.

[System M and System J]: https://en.wikipedia.org/wiki/CCIR_System_M
[Game Gear RGB]: http://members.optusnet.com.au/eviltim/ggrgb/ggrgb.html
[timings in GBATEK]: https://problemkaputt.de/gbatek.htm#dsvideostuff

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10 changes: 6 additions & 4 deletions gba/README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -88,13 +88,15 @@ came to be called "240p" video.
Some handhelds drive their internal LCD with System M-like timings.
For example, the Game Gear's display has 144 active lines, which
are centered in the 240p output of EvilTim's [Game Gear RGB] mod.
The GBA, on the other hand, uses an incompatibly slower 13.6 kHz
horizontal sync. Game Boy Player has to use a frame buffer to
convert the timing to 240p or 480i, which adds lag. This is why
the GBA port is renamed.
The Nintendo DS likewise drives 192 out of 263 lines at 15.7 kHz
according to [timings in GBATEK]. The GBA, on the other hand, uses
an incompatibly slower 13.6 kHz horizontal sync. Game Boy Player
has to use a frame buffer to convert the timing to 240p or 480i,
which adds lag. This is why the GBA port is renamed.

[System M and System J]: https://en.wikipedia.org/wiki/CCIR_System_M
[Game Gear RGB]: http://members.optusnet.com.au/eviltim/ggrgb/ggrgb.html
[timings in GBATEK]: https://problemkaputt.de/gbatek.htm#dsvideostuff

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