Table 4. Instruction Set (Notes I,

Version

Command

w

x

x

x

1

0

0

0

0

Command codes

Indicates 7658

indicates

Seek

Command

W0

0

0

0

1

11

1

Command code

W

X

X

X

X

X

HD

US,

W

NCN

Execution

Invalid

Command

W

Codes

Note:

(1) Symbols used in this table are described at the end of this section.

(2)

should equal 1 for all operations.

(3)

Don’t care, usually made to equal 0.

Invalid Command codes (No op-

goes

state)

System Configuration

Figure 2 shows an example of a system using a

Figure 2. System Configuration

5-18