Installation Guide APA-348 MiniSCSI Plus Parallel-to-SCSI Host Adapter R AA AAAA AAAA AAAA AA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAA AAAAA AA APA-348 Installation Guide AA AA AA AA AA Part Number: 510603-00, Rev.
1 Overview This Installation Guide explains how to physically install and configure Adaptec APA-348 MiniSCSI™ Plus Parallel-to-SCSI host adapters. The MiniSCSI Plus has been designed to provide simple, flexible control of most SCSI devices. The adapter’s highspeed operation is fully compatible with bidirectional parallel ports, offering excellent performance while remaining compatible with unidirectional ports found on many older computers.
2 Host Adapter Layout This diagram shows the APA-348 components. 3 Default Settings The MiniSCSI Plus operates correctly with the factory default settings in most PCs: Parameter Host Adapter SCSI ID Host Adapter Termination Port Address Speed Selection Extended Translation for Drives Over 1 GByte 1 Default Setting 7 Enabled 378h (Options: 278h, 3BCh) Most Compatible1 Automatic (Enabled) See Maximizing Performance on page 5 to increase speed.
Connecting the MiniSCSI Plus WARNING: Turn OFF the computer, printer, and SCSI devices when connecting or disconnecting the MiniSCSI Plus. This protects against damage to any components. Connect the MiniSCSI Plus parallel port connector to a parallel printer port on your computer. You may use either LPT1, LPT2 or LPT3—the MiniSCSI Plus drivers automatically detect which port is in use.
Assigning SCSI IDs If you connect more than one SCSI device to the MiniSCSI Plus simultaneously, make sure that each device’s SCSI ID (device number between 0 and 6) is different; ID 7 is reserved for the adapter and cannot be changed. IDs must be different to prevent conflicts when the MiniSCSI Plus communicates with the devices. See your SCSI device documentation for details. Terminating the SCSI Bus The SCSI devices on both ends of the SCSI bus must be terminated.
Caution: If you disconnect your SCSI device(s) from the MiniSCSI Plus while in use, the adapter loses power and does not recognize the SCSI device(s) when reconnected. Reboot your computer in this case. Connecting the Printer Connect a standard parallel printer cable to the MiniSCSI Plus printer passthrough connector if you wish to simultaneously use a parallel printer with your MiniSCSI Plus. No special configuration or switching is needed to use your printer. For U.S.
many system configurations, implementing a special data-transfer mode can result in a 15-20% speed improvement. Before trying the techniques described below, make sure your SCSI hardware and software are properly installed and configured, and running without problems. Attempts to improve performance may not work on your particular installation. Knowing that the basic installation is working will aid in determining whether performance enhancements will work as well.
The /M1 setting enables blind mode, and /M0 (or no /M entry) is standard full handshaking. The change is made to the line device=[path]ma348.sys in your config.sys file, using any standard text editor. For example, to turn full handshaking off for better performance, the line should look something like this: device=\tscsi\ma348.sys /m1 After making this change and saving your config.sys to your boot drive, reboot your computer for the change to take effect.
have blind mode compatibility and should remove the /M1 switch from config.sys. If no problems are noted, proceed to the next step. b Perform a chkdsk command on all hard disk drives (without the /F option) and/or a chkcd (supplied with your software) command on all CD-ROM drives. If a problem is evident (such as absurdly wrong numbers being reported), you probably do not have blind mode compatibility and should remove the /M1 switch from your config.sys. If no problems are noted, proceed to the next step.
6 If you share your MiniSCSI Plus adapter among several systems or carry it for use on other systems, do not use the /M1 switch unless you are absolutely sure that the other systems are compatible. Changes may take place to the system configuration in your absence. It is better to run a little slower than to take a chance on corrupting your data. Additional /M Switch Options Switch settings /M2 and /M3 correspond to /M0 and /M1 but force the adapter to operate in undirectional mode.
printer. For instance, Novell® NetWare® software uses the capture command for this purpose. If this is the case, the software will not detect the hardware at bootup. The simplest solution is to change your computer’s parallel port hardware to LPT2 or LPT3, or change your network redirection to a different port.
7 SCSI Connector Pinouts This section documents the SCSI interface connector on the MiniSCSI Plus as well as typical connectors found on SCSI devices. Internal SCSI devices commonly use a 50-pin header connector (SCSI specification, Alternative 1), consisting of two rows of 25 male contacts with adjacent contacts 2.54 mm (0.1 inch) apart, as shown below. .......................... ..........................
Pin Alt. 1 Internal 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 Pin Alt. 2 External 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Function Gnd Gnd Gnd Gnd Gnd Gnd Gnd Gnd Gnd Gnd Gnd Gnd Open Gnd Gnd Gnd Gnd Gnd Gnd Gnd Gnd Gnd Gnd Gnd Gnd Function -DB0 -DB1 -DB2 -DB3 -DB4 -DB5 -DB6 -DB7 -DBP Gnd Gnd Gnd Termpwr Gnd Gnd -ATN Gnd -BSY -ACK -RST -MSG -SEL -C/D -REQ -I/O Alt.
FCC Compliance Statement NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference in residential installations. This equipment generates, uses, and can radiate radio frequency energy, and if not installed and used in accordance with the instructions, may cause harmful interference to radio communications.
