¹ The number of bytes transmitted in the previous Read Modified CCW is stored in the LDNRMLEN field in the LDNCB. For this Read Modified, enough buffers are allocated to hold LDNRMLEN bytes of data. If this is not enough buffers for the device to send all of the pending data, the channel program will end on the Read Skip CCW. The Read Skip CCW reads all of the pending data but does not transmit any of it. The new length is stored in LDNRMLEN. (The length is computed by subtracting the residual byte count in the CSW from X'7FFF'.) Then the channel program is executed again with one more buffer than necessary allocated to read and transmit all of the pending data.