What was a punch card machine and when was it used?
Punch card Machines and machines that stamp a date and time on an card. These were often used in factory's to log employees work time. These are still in use today.
Computer Punch Cards
Punch card machines were the method for creating and storing computer programs. A card with 80 columns would be put in the machine and a line of a computer program punched into it. It had a QWERTY type keyboard and was pretty klunky to use. (I wrote my first computer programs on one!) The cards were stacked up and run through a card reader, which would program the computer and execute the progam.
I believe punch cards came into being in the 1960's. Most places phased out the punch cards in the 1980's, though there might still be a few around. Basically the transition was:
- Punch Cards
- Reel to Reel Tape
- 8" SS Floppies
- Hard Drives began to be available
- 5 1/2" SS Floppies
- 5 1/2" DS Floppies
- 5 1/2" DS HD Floppies
- 3 1/2" DS HD Floppies
- Flash drives
When reporting to work as some factories, a worker would pick up a time card with his employee number on it. He would then insert the card into a slot in a special clock that would punch coded holes into the card. At the end of the work day, he would insert the same card into the clock when he left the factory. The "punched" time card was a record of when he entered and…
It is the medium by which people communicate with computers in the olden days. Computer programs are written in punched cards, input data are also written in punched cards. There was a special machine called "card reader" to interpret what were in the punched cards and convert them into machine readable form.
A Jac 40 is an accessory that holds a punch card. It unit hangs around the knitter's neck. The card is advanced manually with a knob before each row. Little"fingers" are either able to protrude through the holes in the card or are stopped by the absence of the holes, which is how the pattern is read from the card. The user then manually pushes needles forward with the protruding "fingers" of the jac 40…
card tabulator card sorter pantograph card punch These were all manually operated, but the tabulator and sorter used electromechanical circuits to automatically perform multiple operations in the time it took the operator to manually cycle the machine once. These machines made it possible to complete the 1890 census in a single year, while the 1880 census (a much smaller task) had taken 8 years with traditional hand methods.