Control Data Cyber 170 State Hardware Reference Manual page 138

PP Instruction Descriptions
PP lnstruction Formats
Figure 4-2 shows PP instruction formats. PP instructions are 16 or 32 bits
long. In instruction descriptions, the operation code is given either by two
or three octal digits. The third digit, when used, indicates the state of the
s-bit (0 or 1 ) in
110
instructions (refer to table 4 - 1 5 ) .
The upper
4
bits of the PP instructions must be 0 to ensure that the
Instructions operate as defined in this chapter.
Table 4-15. PP Nomenclature
Term Description
Specifies instruction operation code.
Specifies I/O instruction subcode.
Specifies channel number.
Refers to the A register (arithmetic register) or the content of
the A register.
Refers to the content of the word at the CM address specified by
the
A
register.
Refers to the
P
register or to the content of the
P
register
(program address register).
Refers to the R register or to the content of the R register
(relocation register).
Refers to the content of the word at the PP memory address
specified by the d field (direct mode).
Refers to the content of the word at the PP memory address
specified by the content of the word at the PP memory address
specified by the d field (indirect mode).
Refers to the PP memory address specified by the m field indexed by
the content of the word at the PP memory addressed specified by the
d field.
(rn
+
(dl) Refers to the content of rhe word at the PP memory address
specified by the m field indexed by the content of the word
at the
PP memory address specified by the d field (memory mode).