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Auxiliary Readout Display (ARO) Logic |
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|  MIL-D-81347C(AS)
Auxiliary Readout Display (ARO) Logic
3.5.1.4.8
3.5.1.4.8.1
Functional Description - The ARO Logic Subunit shall be de-
signed to accept computer generated digital information and convert it to a form suitable for driving
two five-inch ARO "CHARACTRON" displays for the purpose of presenting alphanumeric tableaux to
the Tactical Coordinator and NAVCOM operators as shown in Figure 45. Figure 46 is a functional
flow diagram of the ARO Logic.
General Description - The ARO Logic Subunit receives signals
3.5.1.4.8.2
from the digital computer through the Maintenance Control Panel, converts and controls the data for
the correct formatting and timing and transmits the proper signals to the ARO Display for presenta-
tion on the CRT screens. Each computer data word contains the information to print two alphanumeric
characters on each ARO display screen. Each character requires six binary bits. The ARO Display
Logic provides for the positioning of the characters on the ARO. The available display positions are
to be 20 rows of 20 characters, or 400 total characters per ARO display.
3.5.1.4.8.3
Operating Requirements
Interface - Provide the interface for the transfer of digital in-
3.5.1.4.8.3.1
formation from the Computer via the Maintenance Control Panel to the ARO Displays. The ARO Logic
Subunit also provides data to the computer for test purposes.
Storage - Provide storage of received digital character infer-
3.5.1.4.8.3.2
mation while the information is being displayed by the ARO Displays.
Signal Generator - The ARO Logic shall provide the ARO Dis-
3.5.1.4.8.3.3
play with character selection, deflection and unblank signals.
Modes of Operation - The ARO Logic shall provide capability of
3.5.1.4.8.3.4
three modes of operation by the setting of the ARO Mode switch located on the Maintenance Control
Panel.
On Line Mode - With the ARO Mode switch in the "On Line"
3.5.1.4.8.3.4.1
Position, the ARO Logic shall be under the control of the computer. The timing of the data transfer,
and the "page" or frame information is under control of the logic. Operations performed by the logic
are: receiving data from the computer, providing information to the ARO Displays for displaying a
character, advancing the position counters and upon receipt of an End of Data command resetting the
position counters and stopping operation to wait for a 33.3 Hz line sync signal.
3.5.1.4.8.3.4.2
Test 1- With the ARO Mode switch in the "Test 1" position the
20 x 20 character test pattern shown in Figure 47 shall be presented on both ARO Displays. This
pattern is used to set the ARO Deflection and Reference gain controls, and as a check of the logic in
the ARO Logic Subunit and of the ARO Displays.
- With the ARO Mode switch in the "Test 2" position, the
3.5.1.4.8.3.4.3
Test 2
matrix test pattern shown in Figure 48 shall
be presented in the upper left hand corner of the 20 x 20
Matrix on both ARO Displays. This pattern
is used for a logic check of the Subunit and the setting of
the selection gain and centering controls on
the ARO Displays.
3.5.1.4.8.4
Interface Requirements
3.5.1.4.8.4.1
General
3.5.1.4.8.4.1.1
Maintenance Control Panel
3.5.1.4.8.4.1.1.1
Computer Signals - The ARO Logic Subunit receives
24-bit
parallel binary words from the computer through the Maintenance Control Panel. Output
data transfer
is accomplished by the Output Data Request/Output Acknowledge scheme. The ARO Logic
shall trans -
mit up to 30 bits of information via the Input Data Request/Input Acknowledge scheme, to
the computer.
These Input/Output schemes are explained in Appendix 1.
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