Tape Writing and Formatting
The tape
write
logic records a flux reversal on the tape
as
a clock pulse
or
a 1 bit
of
data. A flux reversal
occurs when the magnetic field
of
the
write
head
reverses polarity. Clock pulses are recorded every 31.25
milliseconds; data bits are recorded between clock
pulses. Any pulses
that
appear between clock pulses
are read
as
1 bits; when no pulse appears between
clock pulses, this is read
as
a 0 bit. Twenty-nine bytes
of
hex
00
are recorded between each record
to
define
clock pulses
to
the tape write. logic. The following
example assumes that the 29 bytes
of
hex
00
have
already been read.
• Data
X'2B'
o
o
•
Read
Clock
• Data Being Written
• Flux
·
Raw
Data
•
Read
Clock
•
Read
Data
X'2B'
·
X'2B'
o
o
4·32
o o
o
o
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