Honeywell 400 Series Hardware Manual page 17

Special Interrupt Signal
STATUS INFORMATION
Bit positions ———> 23 22 21 2°
Major Status Code—p O 0 0 0
Bit positions —————>25 24 2a 22 2"1 2°
Substatus Code—90 0 x x 1 x
A bit shown as "0" must always be zero. A bit shown as "x" can be either one or zero.
A l-bit identifies the existing condition. The pattern of x's, 1's, and 0's indicates which
substatuses can occur together. .
The major statuses that may be encountered by a punched card subsystem are described on
the following pages. The list below shows the 4-bit configuration for each major status
possible. The exact statuses returned by aparticular subsystem are given in the subsystem
descriptions in Appendix A.
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