DA/SP (контакт 39 IDE/ATA разъёма) - Device Active / Slave Present.

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DASP- (Device active, device 1 present)
During the reset protocol, DASP- shall be asserted by Device 1 to indicate that the device is present. At all other times, DASP- may be asserted by the selected active device.
[www.t13.org]

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DA/SP - индикатор активности устройства / присутствия Slave (во время инициализации)
[М.Гук - Аппаратные средства IBM PC]