Load Status
Organizational graphic tag to help group instructions



Format of instruction


This instruction sets or resets the carry and overflow indicators. Bits 14 and 15 of the instruction set or reset the indicators as follows:

  Set or Reset
Bit 14 Bit 15 Carry Indicator Overflow Indicator
0 0 reset (=0) reset (=0)
0 1 reset (=0) set (=1)
1 0 Set (=1) reset (=0)
1 1 set (=1) set (=1)

This instruction is not valid in the long format. If an attempt is made to execute a load-status instruction in which the F bit = 1, the instruction is still treated as a short-format instruction by the system.

A load-status instruction is usually the core-storage word addressed by a store-status instruction. The load-status instruction is subsequently executed before a return to the routine originally interrupted — the routine whose status was stored by the store-status instruction.

Core storage is not addressed as a result of execution of a load-status instruction.

Indicators: The carry and overflow indicators are affected as described under the description of this instruction.


Load Status

Assembler Language Coding Hexadecimal Value Description of Instruction
Label   Operation   F T    
21 25
27 30
  32 33   35..40..
    LDS         0 2000 Set CARRY and OVERFLOW indicators OFF
    LDS         1 2001 SET OVERFLOW ON and CARRY OFF
    LDS         2 2002 Set OVERFLOW OFF and CARRY ON
    LDS         3 2003 SET CARRY and OVERFLOW indicator ON

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