Class 5: Input/Output Control Instructions - Xerox 530 Language And Operations Reference Manual

Class 4 instructions are written in symbolic form according
to the fo" ow i ng syntax
lobe I m *s,d
1. The mnemonic operation code (m) determines the value
of OP (bits 0-8).
2. The optional asterisk (*) at the front of the argument
field sets the IS bit (invert source). This causes the
contents of the source register to be inverted (one's
complemented) before the operation is performed.
3. The first argument, designated by s, is an integer in
the range zero through seven that specifies the source
register to be used.
4. The second ar9ument
f
designated by d, is an integer in
the range zero through seven that specifies the desti-
nation register to be used.
The instructions in Class 4 are:
Mnemonic
RCPY
RADD
ROR
REOR
RAND
RCPYI
RADDI
RORI
REORI
RANDI
RCPYC
RADDC
RORC
REORC
RANDC
RCLA
RCLAI
RCLAC
Function
Register Copy
Reg i ster Add
Register OR
Register Exc IlJsive OR
Regist'er AND
Regist'er Copy and Increment
Register Add and Increment
Regist'er OR and Increment
Regist'er Exc lusive OR and Increment
Regist'er AND and Increment
Register Copy and Carry
Register Add cmd Carry
Register OR and Carry
Register Exclusive OR and Carry
Register AND and Carry
Register Clear and Add
Register Cleal', Add, and Increment
Register Clear, Add, and Carry
CLASS 5: INPUT/OUTPUT CONTROL INSTRUCTIONS
There are five instructions with which the Xerox 530, Sigma 2,
and Sigma 3 computers perform and control I/O operations:
Start Input/Output (SIO)
Test Input/Output (TIO)
Test Device (TDV)
Halt Input/Output (HIO)
Acknowledge I/O Interrupt (AIO)
The form for I/O Control instruction is
, , ,I. , ,
~~
• '" "I" " "
"I
Class 5 instructions are written in symbolic form according
to the following syntax:
label m
The mnemonic operation code determines the entire config-
uration of the instruction.
The instructions in Class 5 are:
Mnemonic
SIO
TIO
TDV
HIO
AIO
Function
Start Input/Output
Test Input/Output
Test Device
Halt Input/Output
Acknowledge I/O Interrupt
Note: More complete information on I/O programming and
operation is contained in the Xerox 530, Sigma 2,
I
and Sigma 3 Computer Reference Manuals and in the
programming reference manual for each peripheral
device.
Input/Output Control Instructions 17