When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
The DC502 in the pictures is not included. The board should be oriented as shown in the pictures. The parts for the original crystal oscillator have to be removed prior to installation. The DC502 requires the addition of a 7490 (not included).
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.