Xerox 560 Reference Manual

Mnemonic
SIO
TIO
TDV
HIO
RIO
POlP
POlR
AlO
o 2 3 4 5 6 7
1
8 9 10 11 12 13 '4
1
'5 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
1* I Operation Code R X t&o~~ I/o Address I ~~~~~~;:~~:!;;-
~. ~--------------~--------~------~-~~-----~~----------------------------~-ing and/or
Operation Code
(Hexadecimal)
4
4
4
4
4
4
4
6
C
D
E
F
F
F
F
E
R
X
R
x
R
x
R
x
R
x
R
x
R
X
R
x
o indexing
15 (2) 17 18
o
20 21
0)
23 24
27 28
31
CA UA
o 000 DCA
1 DCA DA
o 000 DCA
CA
UA
1 DCA DA
o 000 DCA
CA UA
1 DCA DA
000
o 000 DCA
CA
UA
1 DCA DA
001
CA
010 CA
o 1 1
CA
00
000
o Portions of a word format that are shaded represent bits that are reserved (after the I/o address is generated) and
must be coded with zeros to ensure program compatibility with possible enhancements to software and/or hardware.
o OCE = operation code field extension; CA = cluster address; UA = unit address; DCA = device controller address;
DA = device address.
o To address a single-unit device controller, bit 24 must be a 0; to address a multiunit device controller, bit 24
must
be a 1.
Figure 13. Formats
of I/O Instructions
Table 13. Description of I/o Instructions
Bit
Applicable Instructions
Position
(Mnemonics)
Function
and/or Description
0
A!! I/O instructions
If this bit is a 1; bits 15-31 of the initla! Vo instruction are modified by in-
direct addressing.
1-7
SIO, no, TDY, and AIO For these four instructions, the operation code uniquely defines the I/O oper-
ation that is to be performed.
HIO,
RIO,
POLP,
and Within bit positions 1-7, these four instructions all have the same operation
POLR
code (X
I
4F'). The instructions are differentiated by using bits 15, 16, and 17
as an extension of the operation code field.
8-11 SIO, no, TDY, and HIO
The value of the R field specifies how much status information is requested
from
the addressed I/O subsystem (lOP, device controller, and device) and
into which general register{s) the status information is to be loaded.
If the
value of the R field is even and not 0, two words of status infol'rTIution OlE: IE:-
quested to be loaded into registers Rand Rul.
If the value of the R field is odd,
one word of status information is requested to be loaded into register R.
RIO
Although
the R field is not used by the RIO instruction, the R field may be
coded with any value as required by the program.
128
Input/Output Instructions

Xerox 560 Specifications

General

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Monthly Duty Cycle	Up to 300, 000 pages
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