This question needs to be reworded. It is not about particular Macs but about particular video cards, which may or may not be built-in.
Ability for a video card to work with a monitor (assuming that it accepts analog input) is based on the following:
* Sync on green is weird, but it is the standard for some built-in Mac graphics cards. Work around it using an adapter that converts sync on green into something more acceptable, or use a different graphics card.
* Other sync methods have their own quirks.
* The video card needs to work with 60Hz at 640 * 480. 60Hz was the resolution for the first VGA monitors and cards, but most IBM clone manufacturers whacked it up to 70Hz for ergonomic reasons. However 60Hz is the baseline and everything should work.
* The video card needs to work with 60Hz at any resolution or some resolutions. Third party cards are more likely to achieve this than built-in graphics.
* Mac 15 pin video --> VGA 15 pin cable adapters behave differently. Collect different ones and record the switch settings for future reference.
Ability for a video card to work with a monitor (assuming that it accepts analog input) is based on the following:
* Sync on green is weird, but it is the standard for some built-in Mac graphics cards. Work around it using an adapter that converts sync on green into something more acceptable, or use a different graphics card.
* Other sync methods have their own quirks.
* The video card needs to work with 60Hz at 640 * 480. 60Hz was the resolution for the first VGA monitors and cards, but most IBM clone manufacturers whacked it up to 70Hz for ergonomic reasons. However 60Hz is the baseline and everything should work.
* The video card needs to work with 60Hz at any resolution or some resolutions. Third party cards are more likely to achieve this than built-in graphics.
* Mac 15 pin video --> VGA 15 pin cable adapters behave differently. Collect different ones and record the switch settings for future reference.