1. Input / Output was totally asynchronous, and performed by peripheral processors . 2. Peripheral processor ( PP or PPU ) instructions are completely different from CPU instructions.3. By attaching an IBM 7044 as a peripheral processor throughput was more than doubled. 4. A 6600 / 7600 Peripheral Processor system was used for I / O, largely unchanged. 5. In other words, only one peripheral processor at a time can use a particular data channel. 6. By attaching an IBM 7044 as a peripheral processor throughput of the 7094 was more than doubled. 7. Each STP task was similar in nature to the peripheral processor programs in earlier Control Data operating systems. 8. The CP had no instructions for input and output, which are accomplished through Peripheral Processors ( below ). 9. The peripheral processors had 4096 bytes of 12-bit memory words and an 18-bit accumulator register. 10. The operating system ran on the peripheral processors , while the user's application ran on the CPUs.
