Title: C74AMST CreationDate: 06/23/93 17:09:07
Pin | I/O | Signal | Pin | I/O | Signal |
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15 | N/A | GND | 40 | O | RST |
16 | I/O | SCSIDATA (7) | 41 | N/A | GND |
17 | N/A | GND | 42 | I | MSG |
18 | I/O | SCSI PARITY | 43 | N/A | GND |
19 | N/A | GND | 44 | I/O | SEL |
20 | N/A | GND | 45 | N/A | GND |
21 | N/A | GND | 46 | I/O | C/D |
22 | N/A | GND | 47 | N/A | GND |
23 | N/A | GND | 48 | O | REQ |
24 | N/A | GND | 49 | N/A | GND |
25 | (Open) |
| 50 | I/O | I/O |
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Termination
The SCSI controller specification defines cable and termination requirements as listed below.
The Dock I has an active termination. Observe the following rules to use SCSI devices.
Internal SCSI device: Always terminate.
External SCSI devices: Terminate only the last SCSI device.
All SCSI buses require termination. The following guidelines must be followed to ensure proper operation of the SCSI bus and SCSI controllers.
Two terminations must be present on the bus. More than two terminations may damage the SCSI controller or option devices, or compromise data integrity. Make sure that the terminators are in place on the end device on either side of the SCSI bus (a total of two only).
The SCSI controller provides termination power (TERMPWR) to the SCSI bus on Pin 26 of the internal and external SCSI connectors. TERMPWR is protected by a thermal
SCSI Cable Length Specifications
The Dock I SCSI controller specification for the SCSI cable length connected to each SCSI interface is three meters (approximately 10
