Some background info on the video chip used by TI, Coleco, SEGA, MSX ...

[Nebulon]

Info from one of the designers of the Texas Instruments video chip that was famously used in the TI-99. ColecoVision, SEGA SG-1000, MSX, and many other game consoles and computers:

"We were about the cancel the whole 9918 program when Coleco came in

with Colecovision and the TI Home Computer took off while at the same

time the MSX computer in Japan (the “MS” standing for Microsoft which

had a short lived joint venture in Japan) started selling big time

using the 9918."

 

"there is a color burst at ~3.58MHz. The 9918’s input clock was ~10.74MHz

or exactly 3 times the color burst reference."

http://msx.hansotten.com/technical-info/tms9918/