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3.1.4 Read/Write Circuit Principles
Write gate activates the read/write head and
degates the read circuits during a write operation.
When the write gate line is inactive, the write
circuits are deconditioned and the read circuits
are conditioned to read.
The erase gate line, active during a write opera-
tion, erases the edges of the data track, as shown
in the following illustration. The edges are erased
to prevent reading adjacent tracks during a read
operation.
ReadIWrite
Head
~te
DATA{) Erased
)1-fi
Data
Motion
vu ---
Erase Heads
Low current line is under microprogram con-
trol and is active from logical track 42 through
76. When this line is active, the current through
the write head is reduced.
From 33FD
Attachment
Write Data
Write Gate
Erase Gate
Low Current
3-8
Write
and
Read/
Read
File Data
Erase
Write
Amplifiers
Drivers
Head
To 33FD
Attachmen
t
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