Summary of Contents for Digital Equipment VAX 4000
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VAX 4000 BA42B Enclosure System Options Order Number: EK–474AB–OP. B01 August 1994 This manual provides reference, configuration, and installation information for the options that the VAX 4000 BA42B Enclosure-based systems (Models 100, 100A, and 105A) support. Digital Equipment Corporation Maynard, Massachusetts...
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August 1994 Digital Equipment Corporation makes no representations that the use of its products in the manner described in this publication will not infringe on existing or future patent rights, nor do the descriptions contained in this publication imply the granting of licenses to make, use, or sell equipment or software in accordance with the description.
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Preparing to Install a TLZ06/TLZ07 in the Right-Hand 8.4.2 Position ......... 8–5 Installing the TLZ06/TLZ07 Tape Drive .
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Removing the Covers from Synchronous Communications 2–2 Port 0 and Port 1 ........2–4 DSW42 Input/Output Module Installation .
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TZK10/TZK11 SCSI ID Jumper Wire Locations ... 10–2 10–3 Connecting the Power Cable and the SCSI Cable ..10–3 10–6 Installing the TZK10/TZK11 Option ....10–4 10–7 Tables...
Preface This manual provides reference, configuration, and installation information for each internal option that the VAX 4000 BA42B Enclosure systems support. Audience This manual is for Digital services personnel. It is also for customers who have a self-maintenance agreement with Digital Equipment Corporation.
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• VAX 4000 Model 100A Installation Information, EK-502AA-IN • VAX 4000 Model 100A Operator Information, EK-503AA-OP • VAX 4000 Model 100A Troubleshooting and Diagnostics Information, EK-505AA-TS • VAX 4000 Model 105A Customer Letter, EK-511AA-CL • VAX 4000 Model 105A Customer Technical Information, EK-514AA-TI •...
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Conventions The following conventions are used in this manual: Convention Description A lowercase italic x indicates the generic use of a letter. For example, xxx indicates any combination of three alphabetic characters. italic type Italic type emphasizes important information, indicates variables, and indicates the complete titles of manuals.
This manual contains descriptions of options that the VAX 4000 BA42B-based systems support. It provides instructions that describe how to install each option into a VAX 4000 BA42-based system. If there is option model-specific information, it is also described. The following is a list of options that the VAX 4000 BA42B-based systems support.
You must set the ID of a small computer system interface (SCSI) device option. In a VAX 4000 Model 100, 100A or 105A, each SCSI device must have a unique SCSI ID. The following table lists the recommended SCSI IDs for the various SCSI devices that the VAX 4000 Model 100, 100A or 105A systems support.
DHW42 Asynchronous Communications Option The DHW42 is an asynchronous communications option for the VAX 4000 BA42-based systems. There are four variants of this option; three variants provide different communications interfaces, and one variant is an upgrade option (see Table 1–1).
DHW42 Asynchronous Communications Option 1.2 Option Contents 1.2 Option Contents The DHW42 option contains components that you install in the system enclosure (internal components) and components that you connect to the system (external components). The DHW42 asynchronous communications option contains these components: •...
DHW42 Asynchronous Communications Option 1.3 Installation Figure 1–2 Removing the Covers from Asynchronous Communications Port A and Port B Slot for Asynchronous Communications Port B Cover Cover Slot for Asynchronous Communications Port A Note: 1. Remove lower cover first. 2. Remove lower cover only for DHW42-AA. MLO-012387 3.
DHW42 Asynchronous Communications Option 1.3 Installation Figure 1–3 DHW42 Input/Output Module Installation Spring Clip CPU Module MLO-009891 To install the DHW42 input/output cable: 1. Connect one end of the DHW42 input/output cable to the connector on the CPU module (see Figure 1–4). 2.
DHW42 Asynchronous Communications Option 1.3 Installation Figure 1–4 DHW42 Input/Output Cable Installation DSW42 Input/Output Module DSW42 Input/Output Cable CPU Module MLO-009892 Install the DHW42 logic board by following these steps. Caution Static electricity can damage integrated circuits. Wear an antistatic wrist strap and place an antistatic mat under the system unit when working with the internal parts of the system unit.
DHW42 Asynchronous Communications Option 1.3 Installation Figure 1–5 Location of the Standoff Pillars on the KA52/KA53 CPU Module Input/Output Cable Connector CPU Module Standoff Pillars (2) PUSH PUSH GA_EN00111A_92A 2. Press down the DHW42 logic board until the connectors on the DHW42 logic board engage fully with the connectors on the CPU module and the standoff pillars lock the board in position (see Figure 1–6.) 1–8 DHW42 Asynchronous Communications Option...
DHW42 Asynchronous Communications Option 1.3 Installation Figure 1–6 DHW42 Logic Board Installation Standoff Pillars (2) DHW42 Logic Board CPU Module MLO-009893 After you install the DHW42 internal components, install the drive-mounting shelves and the enclosure cover. When you install the DHW42-CA variant, place the modem labels, supplied with the option, over the existing icons for the asynchronous communications ports A (lower port) and B (upper port).
If the system passes the test, install the external components. If the system fails the test, the console terminal will display an error message. Refer to the VAX 4000 Model 100, 100A, 105A KA52/KA53 CPU System Maintenance manual for more information.
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2.1 Ordering Information Table 2–1 lists the order numbers for the DSW42 options that Digital services personnel install in a VAX 4000 BA42B-based system. It also gives the external cable requirements for the different communications interface standards. Table 2–1 Ordering Information...
DSW42 Synchronous Communications Option 2.2 Option Contents 2.2 Option Contents The DSW42 option contains components that you install in the system enclosure (internal components) and those that you connect to the system (external components). Figure 2–1 shows the contents of a DSW42 option. Table 2–2 gives further information on the components of this option.
DSW42 Synchronous Communications Option 2.3 Installation Figure 2–2 Removing the Covers from Synchronous Communications Port 0 and Port 1 Slot for Synchronous Communications Port 1 Cover Cover Slot for Synchronous Communications Port 0 MLO-012386 2. Place the DSW42 input/output module, with external connectors facing out, on the support tabs on the back of the enclosure (see Figure 2–3).
DSW42 Synchronous Communications Option 2.3 Installation Figure 2–3 DSW42 Input/Output Module Installation Spring Clip DSW42 Input/Output Module CPU Module MLO-009894 To install the DSW42 input/output cable: 1. Connect one end of the DSW42 input/output cable to the connector on the CPU module (see Figure 2–4).
DSW42 Synchronous Communications Option 2.3 Installation Figure 2–4 DSW42 Input/Output Cable Installation DSW42 Input/Output Module DSW42 Input/Output Cable CPU Module MLO-009895 To install the DSW42 logic board, follow these steps. Caution Static electricity can damage integrated circuits. Wear an antistatic wrist strap and place an antistatic mat under the system unit when working with the internal parts of the system unit.
DSW42 Synchronous Communications Option 2.3 Installation Figure 2–5 Location of the Standoff Pillars on the KA52/53 CPU Module Input/Output Cable Connector CPU Module Standoff Pillars (2) PUSH PUSH MLO-012350 2. Press down the DSW42 logic board until the connectors on the DSW42 logic board engage fully with the connectors on the CPU module and the standoff pillars lock the board in position (see Figure 2–6).
If the system passes the test, install the external cable. If the system fails the test, the console terminal will display an error message. Refer to the VAX 4000 Model 100, 100A, 105A KA52/53 CPU System Maintenance manual for more information.
MS44-BA option have components on both sides of the module. The memory modules in a MS44L-BA option have components on one side only. Table 3–1 shows the variants of the memory options that the VAX 4000 BA42B-based systems support. Table 3–1 MS44 and MS44L Variants...
MS44L and MS44 Memory Options 3.3 Installation 3.3 Installation To install an MS44 memory option in a VAX 4000 BA42B-based system, you must remove the enclosure cover. (Refer to the VAX 4000 BA42B Enclosure Maintenance manual for more information.) Caution Use only memory modules that are qualified by Digital.
MS44L and MS44 Memory Options 3.3 Installation Figure 3–2 Memory Module Installation Metal Board Clip MS44 Memory Modules MLO-009897 4. Repeat the procedure in steps 1, 2, and 3 for the other memory modules. 3–4 MS44L and MS44 Memory Options...
SIMM or set of SIMMs caused the failure. Also, always reset newly installed SIMMs if the system fails. Refer to the VAX 4000 Model 100, 100A, 105A KA52/53 CPU System Maintenance manual for more information.
74-744226-01), and four screws (P/N 12-31734-01). 4.3 Setting the DSSI ID In a BA42B-based VAX 4000 system, each DSSI device must have a unique DSSI ID number. When installing RF31T/RF35/RF36 disk drive options, the DSSI ID must be set to an ID that is not used by any other DSSI device in the system.
RF31T/RF35/RF36 Disk Drive Options 4.3 Setting the DSSI ID Figure 4–1 RF31T/RF35/RF36 Option Busy LED Fault LED LJ-02126-TI0 Table 4–1 shows the DSSI ID jumper combinations. Table 4–1 RF31T/RF35/RF36 DSSI ID Jumper Wire Combinations DSSI ID Pin 5 Pin 3 Pin 1 2.
(Refer to the VAX 4000 BA42B Enclosure Maintenance manual for more information.) RF31T/RF35/RF36 disk drive option can only be installed on the upper drive-mounting shelf of a VAX 4000 BA42B-based system. To install the RF31T/RF35/RF36 disk drive option, follow these steps: 1.
RF31T/RF35/RF36 Disk Drive Options 4.4 Installation Figure 4–2 Sample RF31T/RF35/RF36 Disk Drive Option with Mounting Brackets G ro mm e t s L J - 0 2 1 6 4 - T I 0 4–4 RF31T/RF35/RF36 Disk Drive Options...
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RF31T/RF35/RF36 Disk Drive Options 4.4 Installation 2. Identify the drive-mounting shelf position where the RF31T/RF35/RF36 option is to be installed. (Refer to the VAX 4000 BA42B Enclosure Maintenance manual for more information about mass storage device orientation and combinations.) 3. Identify the power cable that provides power to the drive-mounting shelf where the RF31T/RF35/RF36 is to be installed.
>>>SHOW DSSI If the system fails the test, the console terminal displays a hard error message containing test mnemonic (DSSI). Refer to VAX 4000 Model 100, 100A, 105A KA52/53 CPU System Maintenance manual for more information. 4.6 Power Requirements Table 4–2 and Table 4–3 show typical dc power requirements of the RF31T /RF35/RF36 disk drives.
The RRD42 CD–ROM drive option is a compact disc, read-only memory, SCSI device. It reads data from industry standard 600M-byte discs. 5.1 Ordering Information The RRD42 CD–ROM drive that Digital services personnel install in a VAX 4000 BA42B-based system has the following order number: • RRD42-EK 5.2 Option Contents The RRD42-EK option contains the following components: •...
RE_EN06377A_91 5.3 SCSI ID Information In a VAX 4000 BA42B-based system, each SCSI device must have a unique SCSI ID number. When you install an RRD42-EK option, you must set the SCSI ID of that device to an ID that is not used by any other SCSI device in the system.
RRD42-EK CD–ROM Drive Option 5.3 SCSI ID Information Figure 5–2 RRD42 SCSI ID Jumper Wire Locations SCSI ID Jumper Wires Parity Note: The SCSI ID shown is 4. RE_EN06242A_91 RRD42-EK CD–ROM Drive Option 5–3...
5.4 Installation You can install the RRD42-EK option in either the left or the right position on the lower drive-mounting shelf of a VAX 4000 BA42B-based system; the preparations for installation differ slightly for each position. See Section 5.4.1 to begin a right-hand slot installation, or Section 5.4.2 for the left, before proceeding to the installation itself.
RRD42-EK CD–ROM Drive Option 5.4 Installation 5.4.2 Preparing to Install an RRD42 in the Left-Hand Position Before you install an RRD42 CD–ROM drive option in the left storage slot on the lower drive-mounting shelf in a BA42B-based system, perform the following steps: 1.
RRD42-EK CD–ROM Drive Option 5.4 Installation Figure 5–3 Connecting the Power Cable and the SCSI Cable RE_EN06378A_91 3. Identify the SCSI cable connector with a pull-tab number that corresponds to the drive position into which you want to install the RRD42-EK option.
RRD42-EK CD–ROM Drive Option 5.4 Installation Figure 5–4 Installing the RRD42-EK Option Captive Screw RRD42 Option RE_EN06379A_91 5. Press down the RRD42-EK option and tighten the captive screw on the mounting bracket to secure the RRD42-EK option in position (refer to Figure 5–4).
The following command provides additional testing of the interface. >>>T E0 2 The console terminal displays an error message if a test fails. Refer to the VAX 4000 Model 100, 100A, 105A KA52/53 CPU System Maintenance manual for more information. 5.6 RRD42 Power Requirements Table 5–2 gives the dc power requirements of the RRD42-EK option.
6.3 SCSI ID Information In a VAX 4000 BA42B-based system, each SCSI device must have a unique SCSI ID number. In an RRD43 CD–ROM drive, the SCSI ID number is determined by three jumpers (See Figure 6–2). When installing an RRD43 CD–ROM drive in a system, set the SCSI ID jumpers to a value that is...
RRD43-EK CD–ROM Drive Option 6.3 SCSI ID Information 2. At the console prompt on the system console terminal, enter the SHOW DEVICE command. This will list the SCSI ID numbers for the existing devices in the system. Verify that you are using a number that is not currently assigned to another device.
6.4 Installation You can install the RRD43-EK option in either the left or the right position on the lower drive-mounting shelf of a VAX 4000 BA42B-based system; the preparations for installation differ slightly for each position. See Section 6.4.1 to begin a right-hand slot installation, or Section 6.4.2 for the left, before proceeding to the installation itself (Section 6.4.3).
RRD43-EK CD–ROM Drive Option 6.4 Installation 3. Remove the blank bezel insert from the enclosure. 6.4.2 Preparing to Install an RRD43 in the Left-Hand Position Before you install an RRD43 CD–ROM drive option in the left storage slot on the lower drive-mounting shelf in a BA42B-based system, perform the following steps: 1.
RRD43-EK CD–ROM Drive Option 6.4 Installation Figure 6–3 Connecting the Power and SCSI Cables MLO-012259 6. Align the tabs on the mounting bracket with the cutouts in the drive- mounting shelf. 7. Tilt the drive slightly to slide the tabs in the drive-mounting shelf cutouts. 8.
(10) and the test mnemonic (SCSI). The following is an example of an error printout. ?? 001 10 SCSI 0050 Refer to the VAX 4000 Model 100, 100A, 105A KA52/53 CPU System Maintenance manual for more information. RRD43-EK CD–ROM Drive Option 6–7...
RRD43-EK CD–ROM Drive Option 6.6 Power Requirements 6.6 Power Requirements Table 6–2 gives the dc power requirements of the RRD43-EK option. Table 6–2 RRD43-EK Power Requirements Mode Current (Amperes) Power (Watts) 5-V Circuit 12-V Circuit Random 0.25 1.50 19.25 Power only 0.25 0.80 10.85...
In the VAX 4000 BA42B-based systems, the only option variant that Digital services personnel install is the RX26-EL option. 7.1 Ordering Information The RX26 diskette drive that Digital services personnel install in a VAX 4000 BA42B-based system has the following order number: •...
SCSI ID number. When you are adding a SCSI device to an existing system, you must set the SCSI ID of that device to an ID that is not used by any other SCSI device in the system. (Refer to the VAX 4000 Model 100, 100A, 105A KA52/53 CPU System Maintenance manual.) To set the SCSI ID of the RX26-EL option: 1.
RX26-EL Disk Drive Option 7.3 SCSI ID Information Figure 7–2 Ventilation Slot for SCSI ID Switch Access Note: The SCSI ID shown is 4 (S1 is on S2 is off and S3 is off). RE_EN06471A_91 2. Determine the SCSI ID number that you want to assign to the RX26-EL option.
Reserved for the SCSI controller. 7.4 Installation To install an RX26-EL option in a VAX 4000 BA42B-based system, you must remove the enclosure cover. Note that when you want to install an RX26 option on the lower drive-mounting shelf of a BA42B-based system, you must also remove the upper drive-mounting shelf.
RX26-EL Disk Drive Option 7.4 Installation Figure 7–3 Installing the RX26 Bezel Insert in a BA42B-Based System Bezel Blank Bezel Insert RX26 Bezel Insert RE_EN06458A_91 7. Identify the power cable that supplies power to the drive-mounting shelf on which you want to install the RX26-EL option. Connect the large power-cable connector to the power connector on the FDI/SCSI board, and connect the small power-cable connector to the connector on the RX26-EL option (see Figure 7–4).
RX26-EL Disk Drive Option 7.4 Installation Figure 7–4 Connecting the Power Cables and the SCSI Cable RE_EN06369A_91 8. Identify the SCSI cable connector with a pull-tab number that corresponds to the drive position into which you want to install the RX26-EL option. Connect this connector to the FDI/SCSI board (see Figure 7–4).
RX26-EL Disk Drive Option 7.4 Installation Figure 7–5 Installing the RX26-EL Option RX26 Option Captive Screw RE_EN06370A_91 10. Press down the RX26-EL option and tighten the captive screw on the mounting bracket to secure the RX26-EL option in position (see Figure 7–5).
The following command provides additional testing of the interface. >>>T E0 2 The console terminal displays an error message if the system fails the test. Refer to the VAX 4000 Model 100, 100A, 105A KA52/53 CPU System Maintenance manual for more information. 7.6 Power Requirements Table 7–3 gives the dc power requirements of the RX26 diskette drive.
TLZ06/TLZ07 Tape Drive Option The TLZ06/TLZ07 tape drive is a 4-mm DAT DDS SCSI-2 device. It reads data from and writes data to industry-standard tape cartridges. Table 8–1 lists the supported tape cartridges. Table 8–1 TLZ06/TLZ07 Tape Cartridges Cartridge Capacity Capacity with Compression TLZ04-CA 1.3 GB...
GA_EN00177A_92A 8.3 SCSI ID Information In a VAX 4000 BA42B-based system, each SCSI device must have a unique SCSI ID number. When installing the TLZ06/TLZ07 tape drive, the SCSI ID must be set to an ID that is not being used by any other SCSI device in the system.
TLZ06/TLZ07 Tape Drive Option 8.3 SCSI ID Information Figure 8–2 TLZ06/TLZ07 SCSI ID Jumper Switch Locations Mode and SCSI Address Switches GA_EN00144A_92A 2. Determine the SCSI ID number assigned to the TLZ06/TLZ07 tape drive. Note When the system is in console mode, you can use the command SHOW CONFIG to view the SCSI ID numbers used by the devices in the system.
The other switch positions determine the TLZ06/TLZ07 tape drive. You must leave these switches at their factory-set default settings. 8.4 Installation To install a TLZ06/TLZ07 tape drive in a VAX 4000 BA42B-based system, you must remove the enclosure cover. 8.4.1 Preparing to Install a TLZ06/TLZ07 in the Left-Hand Position To prepare a VAX 4000 BA42B-based system for the installation of a TLZ06/TLZ07 tape drive in the left-hand drive position, follow these steps.
8.4 Installation 8.4.2 Preparing to Install a TLZ06/TLZ07 in the Right-Hand Position To prepare a VAX 4000 BA42B-based system for the installation of a TLZ06/TLZ07 tape drive in the right-hand drive position, follow these steps. 1. Attach the mounting bracket as follows: Facing the front of the drive,...
TLZ06/TLZ07 Tape Drive Option 8.4 Installation 4. Identify the SCSI cable connector with a pull-tab number that corresponds to the drive position into which you want to install the TLZ06/TLZ07 tape drive. Connect this connector to the back of the TLZ06/TLZ07 tape drive (see Figure 8–3).
The following command provides additional testing of the interface. >>>T E0 2 The console terminal displays an error message if the system fails the test. Refer to the VAX 4000 Model 100, 100A, 105A KA52/53 CPU System Maintenance manual for more information. 8.6 Power Requirements Table 8–3 gives the dc power requirements of the TLZ06/TLZ07 tape drive.
The TZ30 tape drive is a single-reel tape, SCSI device. It reads data from and writes data to 95M-byte CompacTape™ or CompacTape II tape cartridges. 9.1 Ordering Information The TZ30 tape drive that Digital services personnel install in a VAX 4000 BA42B-based system has the following order number: •...
SCSI ID number. When you are adding a SCSI device to an existing system, you must set the SCSI ID of that device to an ID that is not used by any other SCSI device in the system. (Refer to the VAX 4000 Model 100, 100A, 105A KA52/53 CPU System Maintenance manual.) To set the SCSI ID of the TZ30-EL option: 1.
TZ30-EL Tape Drive Option 9.3 SCSI ID Information 3. Set the switches for the SCSI ID number that you want. Table 9–1 shows the SCSI ID numbers and the SCSI ID switch positions that correspond to these numbers. Figure 9–2 TZ30 SCSI ID Switch Locations Notes: 1.
(Refer to the VAX 4000 BA42B Enclosure Maintenance manual for more information.) In the VAX 4000 Models 100, 100A, and 105A, the TZ30-EL option be installed only in the right-hand position on the lower drive-mounting shelf.
TZ30-EL Tape Drive Option 9.4 Installation Figure 9–3 Installing the TZ30 Bezel Insert Bezel Insert Blank Bezel Insert Bezel MLO-009948 3. Push the blank bezel insert that covers the right drive-mounting position on the lower drive-mounting shelf. Remove the blank bezel insert from the enclosure (see Figure 9–3.) 4.
TZ30-EL Tape Drive Option 9.4 Installation Figure 9–4 Connecting the Power Cable and the SCSI Cable RE_EN06372A_91 5. Identify the SCSI cable connector with a pull-tab number that corresponds to the drive position into which you want to install the TZ30-EL option. Connect this connector to the back of the TZ30-EL option (see Figure 9–4).
TZ30-EL Tape Drive Option 9.4 Installation Figure 9–5 Installing the TZ30 Option TZ30 Option Captive Screw RE_EN06373A_91 7. Press down the TZ30-EL option and tighten the captive screw on the mounting bracket to secure the option in position (see Figure 9–5). After you install the TZ30-EL option, install the upper drive-mounting shelf (if removed) and the enclosure cover.
The following command provides additional testing of the interface. >>>T E0 2 The console terminal displays an error message if the system fails the test. Refer to the VAX 4000 Model 100, 100A, 105A KA52/53 CPU System Maintenance manual for more information. 9.6 Power Requirements Table 9–2 gives the dc power requirements of the TZ30-EL option.
TZK10-HG/TZK11-HG Tape Drive Options The TZK10/TZK11 tape drives are 1/4-inch cartridge (QIC), SCSI devices. They read data from and write data to industry-standard tape cartridges. Table 10–1 shows the tape cartridges that the TZK10 tape drive supports, and Table 10–2 shows the cartridges the TZK11 supports. Table 10–1 TZK10 Tape Cartridges Cartridge Capacity (bytes)
SCSI ID number. When you are adding a SCSI device to an existing system, you must set the SCSI ID of that device to an ID that is not used by any other SCSI device in the system. (Refer to the VAX 4000 Model 100, 100A, 105A KA52/53 CPU System Maintenance manual.)
TZK10-HG/TZK11-HG Tape Drive Options 10.3 SCSI ID Information To set the SCSI ID of the TZK10/TZK11, follow these steps: 1. Locate the SCSI ID jumper wires on the back of the TZK10/TZK11 (see Figure 10–2). Figure 10–2 TZK10/TZK11 SCSI ID Jumper Wire Locations SCSI ID Jumper Wires Parity...
Note that when you want to install a TZK10/TZK11 on the lower drive-mounting shelf of a BA42B-based system, you must also remove the upper drive-mounting shelf. (Refer to the VAX 4000 BA42B Enclosure Maintenance manual for more information.)
10.4.1 Preparing to Install a TZK10/TZK11 Option in the Right-Hand Position To prepare a VAX 4000 BA42B-based system for the installation of a TZK10/TZK11 in the right-hand drive position, follow these steps: 1. Attach the mounting bracket as follows: Facing the front of the drive,...
TZK10-HG/TZK11-HG Tape Drive Options 10.4 Installation Figure 10–3 Connecting the Power Cable and the SCSI Cable RE_EN06375A_91 3. Identify the SCSI cable connector with a pull-tab number that corresponds to the drive position into which you want to install the TZK10/TZK11. Attach this connector to the back of the tape drive (see Figure 10–3).
TZK10-HG/TZK11-HG Tape Drive Options 10.4 Installation Figure 10–4 Installing the TZK10/TZK11 Option TZK10 Option Captive Screw RE_EN06376A_91 5. Lower the TZK10/TZK11 and tighten the captive screw on the mounting bracket to secure the tape drive in position (see Figure 10–4). After you install the TZK10/TZK11, reinstall the upper drive-mounting shelf (if removed) and the enclosure cover.
A0 to A5(hexadecimal), and the console terminal displays a hard error message containing the test mnemonic (SCSI). Refer to the VAX 4000 Model 100, 100A, 105A KA52/53 CPU System Maintenance manual for more information.
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