This a replacement Shift register IC for the KNA6034201 (for populating the tilemaps )
Used on IREM boards like Kung Fu Master, R-Type, Legend of Hero Tonma, Image Fight and Hammerin' Harry.
It has been known to fail often nowadays.
Parts required :
- 6 x 74LS166 in a SOIC 16 package
- 6 x 104 caps in 0603 package
- 2 x 20 round pin header
More info : https://www.youtube.com/watch?v=1xx96TIh6kw