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|  MIbD-81347C(AS)
(8) N o i s e - Noise of any type such as crosstalk, ringing, etc,
shall not cause a logic level signal at the MDM/Logic Unit 4 interface to exceed any of the require-
ments as specified in the Logic 1 or Logic 0 definitions in the MDM section of this specification.
Data Tracks
3.5.4.4.4.3.3.4.7
Recorded Data Tracks - The Magnetic Drum shall contain 384
3.5.4.4.4,3.3.4.7.1
addressable data tracks. In addition there shall be a mmimum of 10 spare tracks (complete with heads)
available for use in the event of track failure. Each data track shall have a flying read/write head.
Utilization of the 10 spare tracks shall be a depot level maintenance procedure. It shall be necessary
to de-pressurize the enclosed drum subassembly, rewire a spare track in place of the defective track
and repressurize the enclosed drum subassembly.
Capacity of Track - Each data track shall have sufficient bit
3.5.4.4.4.3.3.4.7.2
capacity to contain 1024 data words plus overhead bits needed for control and test purposes. Each
data word is comprised of 30 computer data bits plus two parity bits.
Track Adressing - Track address shall be specified to the MDM
3.5.4.4.4.3.3.4.7.3
remain static as long as that track is to be
by means of a nine-bit binary address word which shall
addressed for purposes of reading or writing. The lowest of the possible address states shall be used
to address a track. The track address format shall be shown in the following track address table.
TRACK ADDRESS TABLE
271
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