Honeywell 400 Series Hardware Manual page 28

If a card jam occurs while the instruction is being executed, the Terminate signal, the
Attention major status, and the Card Jam substatus are signaled immediately.
If any Attention condition other than a card jam occurs during instruction execution, status
sent at the time of the row Terminate signal is the Intermediate condition until the Terminate
signal for the last row is transmitted. At that time, the Attention status is reflected along
with the appropriate substatus information. Generally, the card just punched will not have
been affected by the Attention status that just occurred.
No-op Instructions
The Request Status and Reset Status instruction do not directly involve media or imply
media movement. Thus, they do not require the card punch to go into the busy state.
REQUEST STATUS INSTRUCTION. ~ When the card punch receives a Request Status
instruction, it transmits major status and substatus signals identifying the following various
conditions which may exist within it.
Channel Ready
Attention
Data Ale rt
Intermediate
Although a Request Status instruction may be rejected by the card punch, the status shown
as the result of an accepted Request Status instruction will never include the Instruction
Rejected major status, since this status is returned only in response to the specific instruc-
tion which was rejected and does not reflect the existing state of the card punch at that
time.
The Request Status instruction does not cause any status conditions to be reset; and status,
therefore, remains unchanged by this instruction.
Since there is no execution sequence to perform in response to the Request Status instruction,
as soon as the instruction sequence has been completed, the card punch returns to the ready
state (provided it is not in the Attention condition).'
RESET STATUS INSTRUCTION. A Reset Status instruction causes all Data Alert conditions
to be reset. (See "Resetting Status," page 10 .) Any existing major status not resettable by
this instruction--Channel Ready, Attention, Intermediate, Channel Busy--continues to be
reflected in the major status code configuration.
There is no execution sequence with the Reset Status instruction; consequently, as soon as
the instruction sequence is completed, the card punch returns to the ready state, provided
no Attention conditions exist.
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