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|  MIL-D-81347C(AS)
If more than one peripheral raise EI's to DMS channels
that are enabled to interrupt, the channel to be transmitted to the computer first shall be in accordance
with the following tabulation:
PERIPHERAL EI CHANNEL PRIORITY
DMS CHANNEL NUMBER
PRIORITY
7
Highest 1
6
2
5
3
4
4
3
5
6
2
1
7
0
Lowest 8
(4) DMS Status EI - Provisions shall be made in the DMS for
the computer to interrogate the state of previously outputted computer command codes. On receipt Of
a DMS instruction E F (see 3.5.4.4.1. 5) with the multiplexer status request code, the DMS shall per-
form the following sequence of events: "
(a) Complete any existing input operation.
(b) Place the multiplexer status data on the computer input
lines.
(c) Raise an EI to the computer.
(d) The computer, at its convenience, samples the input
data lines and transmits an acknowledge signal to the DMS.
(e) On detecting the acknowledge signal, drop the EI line to
the computer.
(f) Resume normal input operations.
(5) Power Monitor EI - On receipt of a change in power status
(Power Turn-On or Power Out-Of-Tolerance) the DMS shall perform the following:
(a) Discontinue any existing input operation, resetting any
active input request level, either EI or IDR.
(b) Place the Power Monitor data on the computer input
data lines.
(c) Delay between 10 microseconds minimum and 20 micro-
seconds maximum.
(d) Raise an EI to the computer.
(e) The computer, at its convenience, samples the input
data lines and transmits an acknowledge signal to the DMS.
(f) On detecting the acknowledge signal, drop the EI line
to the computer.
(g) Resume normal input operations.
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