This section summarizes requirements related to specifications and standards for SCSI peripherals.
17. SCSI bus parity signal defined in the SCSI-2 specifications
| Required |
All SCSI peripherals must implement the SCSI bus parity signal defined in the SCSI-2 specification.
18. Cables conform to requirements in clause 6 of SPI specification
| Required |
Clause 6 of the SPI specification defines the various characteristics of cables for SCSI devices. See Small Computer Interface (SCSI-3) Parallel Interface (SPI) [X3T9.2/91-10].
19. User cannot plug in cables incorrectly for internal connections
| Required |
For an internal configuration, one end of the internal SCSI bus cable is plugged into a shrouded or keyed connector on the host adapter, which ensures that the cable is positioned properly. This connector must comply with the SPI specification.
20. Internal SCSI peripherals do not terminate the SCSI bus
| Required |
SCSI peripherals must not terminate the bus. Both internal and external cable ends are instead terminated by plug-in connectors. The requirement for automatic termination on the host adapter, as specified in the "SCSI Host Adapter Requirements" earlier in this chapter, ensures that the user is able to connect combinations of peripherals easily.
A design in which termination for peripherals can be set by jumpers or switches or by changing resistor packs is not acceptable for the "Designed for Microsoft Windows" logo.
21. External connectors use automatic termination or accessible onboard termination switch
| Required |
The preferred implementation for an external SCSI peripheral device is to provide automatic termination. In the absence of automatic termination, an external pluggable terminator must be connected to the last open device connector on the bus. If a mechanical means is provided for setting termination, the switch must be accessible to the user without opening the PC case.
22. High-density, shielded device connector meets SCSI-2 standards
| Recommended |
If a high-density connector is used, it must meet SCSI-2 standards.
23. Removable SCSI devices support for Media Status Notification Specification for SCSI and ATAPI Devices
| Required |
The Microsoft specification for Media Status Notification Support for SCSI and ATAPI Devices (v. 1.0 or higher) defines the protocol for removable SCSI devices to use in communicating about the current state of removable media.