Radio Shack TRS-80 Hardware Manual page 10

Procedure
To connect
the
primary hard
disk drive
10
your
computer
follow
these
steps:
1.
Connect one end
of
the hand disk
expansion cable
to
the
I/O
bus card
edge
of
your computer.
2.
Connect
the other
end
to the
COMPUTER
IN
connector
(50-
pin)
on
the
back
of
the primary hard disk
drive
3.
Connect
the
power
cord
to
the primary
drive.
Plug ihe other
end
into
a
grounded
AC
power
source
of
appropriate
voltage.
Connecting
the
Secondary
Drives
Each secondary
hard disk drive
comas
with
Thf>
fnl
lowing:
• Secondary Hard
Disk
Expansion Cable
•
Pats Cable
•
Power Cord
Tho
secondary hard
disk drives connect
to
the
computer
via
the
primary hard
disk
drive.
Be
(ore
you can Connect
the
secondary
drives,
however,
you must
take
all
your hard disk
drives—
including
the primary
drive
—
to
a
Radio Shack computer
technician
to
be
modified-
After the
modification, only
one
drive
is
labeled as !he
terminator.
This
drive
must be
the
last
in tho chain-
Warning:
If
you have boon
using the hard disk system
and
are
adding a secondary
drive,
be sure
to
back up
all
the infor-
mation onto floppy
diskettes before
you have
your hard disk
drives modified. This modification could erase
all
the informa-
tion
you have
previously ctorod
on
your hord
dtok
drives.
Refer
to
Chapters
for information
on
backing
up
to diskettes
on
your
computer