To simplify the design of peripheral devices, these relied on the processor. The card reader had no memory buffers, but instead gave the CPU a level-zero (highest priority) interrupt after each individual column of the card had been read. If the CPU did not respond and store the twelve bits of data before another such interrupt indicated that the next column had been read, data would be lost. Similarly, the 1132 printer relied on software on the 1130. When a letter such as codice_7 came into position, the CPU had to analyze a buffered line of text and assemble an array of bits that would indicate to the 1132 which print positions should be printed with codice_7. If the CPU could not respond before the codice_7 rotated out of position, print speed would be severely degraded.