Alpha Microsystems AM-647 Spezifikationen PDF herunterladen (Seite 18)

Page 13Installation Instructions: Roadrunner 030 & 040 AM-1000 / AM-1200 Upgrade

7.0SCSI DISPATCHER

In order to use the Roadrunner’s on-board high performance SCSI controller, you must

define the "SCSI Dispatcher" in your system initialization command file. AMOS uses the

dispatcher to communicate with the SCSI controller chip. All communications with the

SCSI controller chip are handled by the dispatcher.

There are two versions of the SCSI dispatcher. SCZRR.SYS is a high performance SSD

protected version of the SCSI dispatcher, which supports command queueing,

synchronous transfers, multi-threaded, and scatter-gather operations. SIMRR.SYS is a

simplified version of the SCSI dispatcher, which is not SSD protected and does not

support the high performance features supported in SCZRR.SYS. SIMRR.SYS is used

when making warm boot tapes and for temporary situations with computers which do

not have an SSD chip; it is not intended for normal operation. While both of these

dispatchers support SCSI devices, there is a tremendous performance increase using

the SCZRR.SYS dispatcher.

The PIC code for the SCSI dispatcher must be purchased separately from Alpha Micro.

See Appendix C for information on how to install the SCSI dispatcher and enter its SSD

PIC code.

If you have any SCSI peripherals attached to the Roadrunner’s SCSI port, you must

define the dispatcher, regardless of whether you are using SCSI-1 or SCSI-2 peripheral

devices.

8.0UPGRADING ROADRUNNER ON-BOARD MEMORY

Roadrunner AM-172 and AM-174 boards have one on-board 72-pin SIMM (single inline

memory module) expansion slot. SIMM memory is available in four sizes: 4, 8, 16, and

32 megabytes. The 80MHz AM-174 board requires a 60ns SIMM; all AM-172 and

AM-174 66MHz boards require a 70ns SIMM. The next section describes how a SIMM

module is installed in AM-172 and AM-174 Roadrunner boards.

8.1Installing Memory

Special care must be taken when installing a SIMM module. The figure on the following

page shows how the curve in the SIMM module must align with pin-1 on the

Roadrunner’s SIMM connector.

The SIMM must be inserted into the connector at a slight angle and after you feel the

SIMM module settle into the connector, you rotate the SIMM into an upright position, as

shown in the illustration. When the SIMM is properly positioned, the metal retainer clips

at each end of the connector will click into position, locking the SIMM in place.

PDI-00172-10, Rev. A03

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Alpha Microsystems AM-647 Spezifikationen Seite 18