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Commodore 1581 - Explanation of Procedures

Commodore 1581
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EXPLANATION
OF
PROCEDURES
send-cmd-string
sends
one
byte
of
the
command
to
determine
whether
the
drive
is
fast
or
slow.
toggle-clock
changes
the
state
of
the
clock
line,
clock-hi
changes
the
state
of
the
clock
to
logic
1.
clock-lo
changes
the
state
of
the
clock
to logic
0.
wait-byte
polls
the
8520
for
a
byte
ready.
read-error
calls
toggle-clock
and
wait-byte,
then
returns
to
the
main
if
there
are
no
errors.
store-data
stores
the
data
in
a
particular
memory
location.
last-byte
depending
on
sector
size,
will
increment
and
com
pare
value
to
sector
size.
last-sector
decrements
the
number
of
sector
transfers
re
quested
and
stops
when
done.
serial-in
sets
the
8520
serial
port
and
driver
circuit
to
input
mode.
read-err
calls
wait-byte
and
evaluates
the
status
of
the
pre
vious
controller
job.
serial-out
sets
the
8520
serial
port
and
driver
circuit
to
out
put
mode.
send-byte
sends
a
byte
of
data
to
the
1581.
read-1581
sends
a
typical
unit
read
to
a
1581.
write-1581
sends
a
typical
unit
write
to
a
1581.
98

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