It has an
Intel 8080A processor and ROMs.
The manual has schematics and some troubleshooting info.
https://www.gamesdatabase.org/Media/SYSTEM/Arcade//Manual/formated/Comotion_-_1976_-_Gremlin.pdfThe end of the video you posted appears to show the first two of every eight pixels stuck "on", creating vertical lines.
A quick look at the system description and block diagram on pages 12-14 leads me to think that the problem could be two stuck data lines, bad character generator memory outputs (#15 on block diagram), a bad shift register (#16), or a bad video combiner. (#17)
Since the character generator memory is where the 8x8 pixel "blocks" are called from (pg 13, paragraph 3), that is the earliest part of the circuit where the stuck pixels could originate and the video combiner is the last part of the circuit where they could originate.
There are 8 outputs from the character generator memory to the shift register (pg 15) so if the outputs for the two pixels on the left of each row in the 8x8 "block"
or the associated data lines are stuck, it will cause the solid two-pixel-wide vertical lines seen in the video.
- The other six character generator memory output lines appear to be working fine all the way thru the video combiner to the CRT.
Scott