scrolling LED sign

I have picked one up @ auction - DOA - No display. Circa 1980's
Power supply is odd to me
dual 7805's - one with tab bonded to chassis - one is insulated
also a TIP 121
large cap on chassis - memory keep alive?
Old Heathkit scope shows major ripple on 5 VDC @ chip legs.

Chris

is this supposed to be a question or you are just stating what you came accross?