ATD-20 8 bit isa clock card ATDCLOCK vintage Clock card, I'd guess you would have to change the 20 year clock chip since it's been over 20 years. Shipping will be added to your bid. Click on tab for shipping estimate to your zip code. Terms Conditions: California Residents please add sales tax. Small items will normally be shipped USPS, larger items Fedex Smartpost or Fedex Ground, please check shipping tab, different options may be available We do ship some items internationally, please inquire. A Handling charge may be added for international shipments. All sales final with no warranties unless stated otherwise.