240pTestSuite-Dreamcast: Monitor Acer cb272

[aldair]

DB15 cable with switch to select VGA (pin 6 and 7 on GND) and RGB (pin 7 on GND) on the Dreamcast.

Acer cb272 monitor with 240p: https://www.amazon.com.br/MONITOR-ACER-CB272-BMIPRX-UM-HB2AA-004/dp/B08GD26CRJ/ref=asc_df_B08GD26CRJ/?tag=googleshopp00-20&linkCode=df0&hvadid=379817900090&hvpos=&hvnetw=g&hvrand=16124941636449756703&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=1032070&hvtargid=pla-1276237575484&psc=1