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Channel Interface
7942 and 7946
Table 2 -1. Device Command Summary (continued)
SET ADDRESS
(COMPLEMENT ARY)
FUNCTION:
OPCODE:
FORMAT:
Used to set the value of the target address and to define the
addressing mode.
16
10
00010000
2
17
10
00010001
2
020
8
021
8
<0001000T>
< P1 > - - - - < P6 >
T
=
address mode (0
=
single vector; 1
=
3-vector)
Single vector format: 6-byte binary number
3-vector format: P1-P3
=
cylinder address
P4
=
head address
P5-P6
=
sector address
SET BLOCK DISPLACEMENT
(COMPLEMENTARY)
FUNCTION:
OPCODE:
FORMAT:
Adjusts the target address by the number of blocks indicated
by the parameter field.
<00010010>
< P1 > - - - -
<
P6 >
Parameter format: 6-byte, signed, two's complement,
binary number
SET LENGTH
(COMPLEMENTARY)
FUNCTION:
Defines the number of bytes in a data transfer.
OPCODE:
FORMAT:
<00011000>
<
P1 ) - - - -
<
P4 >
Parameter format: 4-byte, unsigned, binary number
2-4
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