ntsc to video interface board

[ed12]

ok topic states about 1/2 of what i am digging for.?
it is a
interface board used on wg4900 monitor's
this board in question is a
part # wg p600
sub part # 85x6311
also used in zenith tv's
bb bowl
from bb #'s i get are
1 of these
57-215110-000
57-215484-003
68-100-228-810 <<this looks like a zenith number to me.?

the board in question take's video in and converts it to r/g/b/s

was used in dragons lair coin ops games

now before u say it i have been chasing this down all day

any taker's with a manual?
up load or pm with link

thanks

ed