How did Harvard Mark I separate data and instruction?
I have read the article in Wikipedia but I didn't understand how data and instruction was separated using a punched paper tape. It said
"The Mark I read its instructions from a 24 channel punched paper tape and executed the current instruction and then read in the next one. It had no conditional branch instruction. This meant that complex programs had to be physically long. A loop was accomplished by joining the end of the paper tape containing the program back to the beginning of the tape (literally creating a loop)."
"This separation of data and instructions is known as the Harvard architecture"
I didn't understand this line, it reads instructions from the paper tape but where is the data?