Do your self a favor and avoid all the Generic Garbage for Dreamcast VGA cables.
There are no good OFF-BRAND VGA cables for the dreamcast.
Too many modern VGA cables cut corners and thus have shoddy quality.
Most VGA cables cheap out and cut corners by reducing the number of ground wires, and tieing all the grounds together.
And they skip out on all the extra cable shielding. The R G B lines all should be coaxial wires with the outer shield being the return voltage, one for each color.
Here is a PIN OUT of the HD 15 VGA plug, note each color has it’s own return.
Ignore the bit about sync on Green as those are only mostly on Sony Brand Devices and displays.
The break out of quality VGA cable wiring, note the 3 coaxial cables.
What you get is a cable that can be heavily influenced by outside interference and completely undermines the whole point of getting a VGA cable/adapter for your
The Retro-Bit VGA adapter isn’t terrible as I have the same adapter.
If you want the best out there, The custom made Hanzo (VGA adapter) and The Toro (VGA and RGB Scart)
With that you still need a actual VGA cable, AVOID those $19 to $35 over-priced, pieces of shit from Staples or Best Buy, get your self a VGA cable from Monoprice.com
Approx $5 for a VGA cable with all 15 individually wired pins, RGB lines are coax, and the RGB lines have their own voltage returns/ earth grounds.
If you have to go cheap, look for a (name brand) Dreamcast RGB scart cable, you still might need a RGB scart/ CGA to VGA adapter.