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I/O System
Octal
Memory
0
Location
ORT
Device
Controller
.14
#3
3 8
X
4
15
16
Device
0
17
Controller
48
X
4
• 20
#4
21
22
Device
0
23
Controller
.24
#5
58
X
4
25
26
27
30
31
32
FORMAT
33
--------
I/O Program Pointer
Ext. Prog. Label
OBI Address
.... ....
.... ....
....
(Reserved)
.... ....
....
Device
Controller
#171
8
I
I
I
I
714~
715
716
717
Figure 7-4.
Device Reference Table
7-4. I/O
INSTRUCTIONS
There are ten
I/O instructions in the system's instruction
set,
six of
which are defined in paragraph 4-14 of this manual.
(All
of the I/O
instructions are fully defined in the HP
3000 Series
II/III Computer System M:lchine Instruction Set,
part no.
30000-
90022.)
The distinction to note
he~e
is that the SIO instruction
is used
in conjunction
with an I/O
program and that
the other
instructions are not.
That is,
an SIO
instruction commands
a
Device Controller
to begin executing its
associated I/O program
which effects a block transfer of data between an I/O device
and
memory.
This is termed an SIO transfer mode.
The other I/O in-
structions transfer
only one word
per
instruction between
the
device and TOS in the
cpu.
This is termed a direct transfer mode
and is used primarily with terminal devices.
7-6
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