Dynamic I/O configuration changes (SUs x86)

On SUs x86 bus peripherals are not configured anymore with IOGEN but are instead configured via X2000. Due to this, the ability to overdefine the I/O configuration, which then allowed predefined devices to be put into operation dynamically later on, is also eliminated.

Disks, tape and network/LAN devices can be added to the configuration during system operations. BS2000 creates additional empty device table entries for this purpose during system initialization:

• for network/LAN devices, 64

• for disk and tape devices, approx. 10% each of the number of devices already defined in the device table (at least 64, at most 2048)