No CONTROL registers exist for I/O paths assigned to devices. The STATUS registers for I/O paths assigned to devices are:
0 - ASSIGN status: 0 - not assigned, 1 - assigned to a device
1 - The interface select code
2 - Number of devices
3 - Device selector of device 1
4 - Device selector of device 2 (if two or more devices are present)
n+2 - Device selector of device n (if n or more devices are present)
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