Hi Roy,

I suspect that the 74HC425 might actually be a 74HC42<b>S</b> in which case it would be a BCD to decimal decoder - which sounds plausible. http://www.datasheetcatalog.com/data.../74HCT42.shtml

here is a circuit that uses them to drive an 8x8 scrolling display
http://www.antrak.org.tr/gazete/1220...image/sema.gif

Here is the supporting text (I hope your Turkish is good )
http://www.antrak.org.tr/gazete/122003/ali_yetis.htm

Gülegüle