Appendix D - Significance Of P And Q Addresses - IBM 1620 1 Manual

Significance of P and
Q
Addresses
OP
Code
Instruction
P Address
*29
Divide
Same as Code 19.
31 Transmit Record
Location to which high-order position of
record is transmitted.
32 Set Flag
Location at which flag is set.
33
Clear Flag Location at which flag is cleared.
*34 Seek Address of Disk Control Field
34 Control Not used.
35
Dump Numerically Location of first character written.
36
Read Numerically Location where first character is stored or
address of Disk Control Field.
37
Read Alphamerically P-l: location where zone digit of first
character is stored.
P: location where numerical digit of first
character is stored.
38
Write Numerically Location of first character written or address
of Disk Control Field.
39
Write Alphamerically P-l: location of zone digit of first character
written.
P: location of numerical digit of first
character written.
41 No OP
Not used.
42
Branch Back Not used.
43
Branch on Digit Branch: location of next instruction executed.
No.Branch: Not used.
44
Branch No Flag Same as Code 43
45
Branch No Record Mark Same as Code
43.
46
Branch On Indicator Same as Code 43.
47
Branch No Indicator Same as Code 43.
48 Halt Not used.
49
Branch Location of next instruction executed.
*55
Branch No Group Mark Not used.
*71
Move Flag Location to which flag is moved.
*72
Transfer Numerical Strip Location of units position of alphameric field.
*73
Transfer Numerical Fill Same as Code 72.
*
Special Feature
Appendix 0 (cont'dJ
o
Address
Location of units position of Divisor.
Location of high-order position of record
transmitted.
Not used.
Not used.
08
and
09
specify disk storage (07)
011
specifies disk storage function performed.
08
and
09
specify I/O device.
011 specifies control function performed.
08
and
09
specify output device.
08
and
09
specify disk storage or input device.
011 specifies function performed.
08
and
09
specify input device.
08
and
09
specify output device or disk
storage.
011 specifies function performed.
Same as Code 35.
Not used.
Not used.
Location tested for digit other than zero.
Location tested for flag bit.
Location tested for Record Mark character.
08
and
09
specify program switch or indicator
tested.
Same as Code 46
Not used.
Not used.
Location tested for record mark.
Location of flag to be moved.
Location of units position of numerical field.
Same as Code 72.
83