I programmed and earned a living with this technology 1965-1980. I don't miss it. I wrote a 4,000-card Assembler program that required two metal trays to transport.
Did anyone else "insert" and "delete" columns by pressing down on one card in the keypunch while duplicating? This enable one card to advance while keeping the other in place.
We invented the "240-column" card at the insurance company where I worked. We stored three digits per column (four bits per digit times three equals twelve rows). Being the 70's (0111), our cards looked like lace doilies.
Did anyone else "insert" and "delete" columns by pressing down on one card in the keypunch while duplicating? This enable one card to advance while keeping the other in place.
We invented the "240-column" card at the insurance company where I worked. We stored three digits per column (four bits per digit times three equals twelve rows). Being the 70's (0111), our cards looked like lace doilies.