Double-sided 1571 in 64 Mode

The 1571 disk drive is a double-sided
drive, and is capable of formatting
disks with 1328 blocks free. This comp-
ares favorably with the 1541 drive, of
course, which can put only 644 blocks
on one side of the disk.

But the 1571 often defaults to a sin-
gle-sided mode, giving only 644 free
blocks on a newly-formatted disk.
Worse yet, this mode only recognizes
644 blocks, even if the diskette has
been formated with 1328! Here's the
story on controlling the single- or
double-sided mode of your 1571:

If you use 128 mode to format a disk,
it will be formatted on both sides,
with 1328 free blocks. Also, 128 mode
will read any 1541/1571 disk, regard-
less of how it is formatted.

One simple command will put your 1571
into double-sided mode, regardless of
the computer to which it's connected.
When you power up in anything other
than 128 mode, just execute the
following line:

    OPEN 15,8,15,"U0>M1":CLOSE 15

Your disk drive will now behave in all
respects as a double-sided drive. To
insure that this will always be the case
turn the command into an autobooting
program and put it on all your
diskettes. You accomplish this, of
course, by using the "Autoboot Maker"
program found on the 1571 Test/Demo
disk.








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