Alpha Microsystems Eagle 250 Manuel du propriétaire télécharger pdf (Page 31)

About AMOS Page 5-5

Eagle 250 Owner's Manual, Revision 01

Generally, AMOS separates a single disk drive into multiple logical devices (in the same way DOS and

Windows can separate a drive into devices C:, D:, and so on). The name for each logical device then uses

the same three letters, with a different number for each. For example, a single 2.1GB hard disk drive

could contain devices named DSK0:, DSK1:, DSK2:, DSK3:, and so on. In most cases with AMOS you

refer to the logical device name.

The disk device containing the AMOS system files, the device AMOS "boots from," is referred to as the

System Disk ; its device name is always DSK0:. Normally this is the first logical device on the first hard

disk, but if for some reason you boot from a different drive, it becomes DSK0:. When you change the

device you boot from, it may also change the names of other devices on your computer—since you are

using a different system initialization command file, the devices may be defined differently.

For example, if your computer contains one disk drive split into three logical devices, and a second drive

divided into six logical devices:

•

When your computer boots from the first drive (the usual state of affairs), that drive is referred to

as three devices named DSK0:, DSK1:, and DSK2:. The second drive is called, for example,

SEC0:, SEC1:, and so on through SEC5:.

•

If you change the computer to boot from the second disk drive (how to do this is described in the

Installation and Technical Manual), it is now called DSK0: through DSK5:, while the “first”

drive might be called FIR0:, FIR1:, and FIR2:.

Remember, this is only an example. Your computer may have a different number of physical disk drives,

and may refer to each physical drive as more or fewer devices. You can see a list of the disk devices on

your computer by using the SYSTAT or DEVTBL command from AMOS command level. These

commands are described in the AMOS System Commands Reference Manual.

Accounts

Disk accounts are an organizational feature AMOS uses to help you keep track of your data. Instead of

making you search through one enormous list of files for the one you're looking for, AMOS groups files

into accounts. An account generally holds files that are related in some way. For example, your

application software and data files are probably organized into several accounts (the software may be in

one account and the data in another), and, often, each user has one or more accounts for his or her

personal files.

Accounts are identified by a two-part account number. The first number identifies the project the account

is in, and the second is the number of the account within the project. The two numbers are separated by a

comma and enclosed in brackets. [1,2], [200,0], and [34,11] are examples of account numbers.

Account numbers are octal numbers, so the digits 8 and 9 aren't used. The highest possible number

is [377,376] and the lowest is [1,0].

The two part structure of the account number allows you another level of organization. Besides grouping

files into accounts, you can group related accounts in the same project. For example, all accounts

containing files dealing with payroll may be in project 50 ([50,0], [50,1], etc.). There’s more on this

subject in the section “Organizing the Disk,” on page 5-7.

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Alpha Microsystems Eagle 250 Manuel du propriétaire Page 31