5. Connect the interface cable.
Make sure your computer and any other peripherals are OFF. Plug either end
of
the
interface cable into either serial port on the back of the drive (see Figure 2). Plug the
other end
of
the cable into the back
of
the computer. If you have another peripheral
(printer or extra drive), plug its interface cable into the remaining serial port on the
drive.
6.
Turn ON the power.
With everything hooked up and the drive empty, you can turn on the power to the
peripherals
in
any order, but turn on the power
to
the computer last. When everything
is
on, the drive goes through a self test. If all
is
well,
the
green light will flash once and
the red power-on light will glow continuously.
If
the green light continues
to
flash,
there may be a problem. Refer
to
the Troubleshooting Guide.
OPERATING MODES
To achieve maximum compatability between the
1571
and other disk drives, the
1571
has two modes
of
operation that allow
it
to
be used
in
a variety
of
situations.
1541 Mode
When you first turn on the 1571, it powers
up
in
1541
mode. That is,
it
works almost
exactly as a
1541
disk drive, which helps maintain compatability with certain special
programs and copy-protected diskettes. Also, many loading routines are dependent upon
the 1541-speed internal timing. However, when the drive
is
in
this mode, it can't take
advantage
of
the special
1571
features.
1571 Mode
In
1571
mode, the drive can take advantage
of
such features
as
double-sided
diskettes, MFM-format diskettes, fast data transfer rates, and burst transfer protocol. The
1571
can determine whether or not the host computer can receive fast data transfer and
transmits accordingly.
Mode Selection
As
mentioned above, the
1571
powers up in
1541
mode. However,
it
automatically
shifts to
1571
mode upon the first
of
a fast serial transfer initiated
by
the host (the
Commodore 128). The Commodore 64 and Plus 4 can't perform fast serial transfers on the
serial bus, but you can shift from
1541
to
1571
mode
by
sending the following BASIC
command: OPEN
1,8,15,"U0>Ml".
Although these computers can't directly take
advantage
of
the drive's faster transfer speeds, they can have twice the normal storage.
If
you are using a Commodore
128
and want the
1571
to remain
in
1541
mode,
you
can send the following BASIC command: OPEN 1 ,8,15,
"U0>M0".
The drive will
then remain in
1541
mode until the next power
up
or system reset.
The possible combinations
of
modes with the Commodore
128
and
1571
are shown
below:
C1281l571
modes-Turn
on the drive, then turn on or reset the computer.
5
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