https://bitsavers.org/pdf/sel/sel32_hardware/303-000270-200_hsio_Mar83.pdf https://bitsavers.org/pdf/sel/sel32_hardware/303-000270-200_... Go to chapter IV. P

https://bitsavers.org/pdf/sel/sel32_hardware/303-000270-200_hsio_Mar83.pdf https://bitsavers.org/pdf/sel/sel32_hardware/303-000270-200_... Go to chapter IV. Prior Art.