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|  MIL-D-81347C(AS)
3.5.1.4.8.5.3
End of Data Command - An End of Data Command shall be used to
terminate a sequence of characters on the ARO'S. This code (41) shall be interpreted as an EOD only
if received in Character 1 of ARO 1; if received in any other character position-, the character associ-
ated with code 41 shall be displayed. Upon receipt of this code, further requests for data shall be
inhibited until receipt of the next 33 Hz sync, all character codes shall be set to octal code 44, and the
X and Y position registers shall each be set to octal code 11. The Output Data Request shall be raised
upon receipt of the 33.3 Hz sync; however, the character selection and X and Y positioning registers
shall not be cleared until receipt of the associated Output Acknowledge from the computer. A time of
160 microseconds minimum prior to unblank shall be allowed for positioning of the beam starting
character position upon receipt of this Output Acknowledge signal. Normal timing operations as shown
in Figures 50, 51 and 52 resume subsequent to the receipt of this first word.
3.5.1.4.8.5.4
Test 1 Mode - With the ARO Mode switch in the Test 1 position
the computer signals are disconnected, and an internally generated Acknowledge signal and character
data are substituted. The End of Data Command sensing gate is disabled so the counters will go to
400 before terminating and wait for the 33.3 Hz sync signal.
3.5.1.4.8.5.5
Test 2 Mode - All of the operational characteristics of Test 1,
above, apply to this test mode. However, special gates do not allow the characters to be unblanked
unless they are in the upper left hand 8 x 8 positions of the 20 x 20 character array. Also, the data
inputs to the input register are such that the 8 x 8 array is arranged in the same sequence as the
CHARACTRON matrix. This sequence is terminated at the beginning of the ninth line instead of after
the 400th character.
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