TANDY 2500 RSX (250-1620/21)  60MB Smartdrive Addendum  Faxback Doc. # 1888

Jumper Settings:

Your computer is shipped with a 60MB SmartDrive (IDE hard drive). A jumper
on Pin pair C/D on the bottom of the SmartDrive configures it for use as
the only IDE drive in the system. Do not alter the jumper setting if you
have only one IDE drive.

If you install another IDE drive, you must change the jumper settings for
the 60MB SmartDrive. Determine whether you want to use the 60MB SmartDrive
as the primary drive or the secondary drive. Then, refer to the following
table to set the jumpers.

The following table summarizes the jumper settings:

JUMPER
PIN PAIRS     SETTING   FUNCTION

C/D           Jumpered* Indicates that the drive is the only IDE drive
                        installed.

C/D + DSP     Jumpered  Indicates that this is the primary drive in a
                        system with two IDE drives.

              Open      Indicates that this is the secondary drive in a
                        system with two IDE drives.

E1            Open*     Reserved for factory use.

* Factory (default) setting.

Refer to the documentation included with the drive you are adding for
instructions on configuring it as the primary or secondary drive.

Drive CAUTIONS:

As you use the 60MB SmartDrive, keep the following information in mind:

* Your computer dealer can help you select a hard drive that is compatible
  with the 60MB SmartDrive. Do not install the Tandy 240MB SmartDrive
  (25-4126). This drive is incompatible with the 60MB SmartDrive.

* The 60MB SmartDrive is configured with the AUTO option of the setup
  utility. Do not use the AUTO option to configure multiple hard drives.
  Refer to hard drive documentation for the hard drive configuration
  parameters. Record the drive parameters on the worksheet near the end of
  the computer user's guide. Run setup to enter the drive type or the
  number, head landing zone, and sectors per track.

Specifications:

             TOTAL CAPACITY: 60 MB
        NUMBER OF CYLINDERS: 762
            NUMBER OF HEADS: 4
          HEAD LANDING ZONE: 0
NUMBER OF SECTORS PER TRACK: 39
   PRECOMPENSATION CYLINDER: 0
        AVERAGE ACCESS TIME: sub 19 m
 TRACK-TO-TRACK ACCESS TIME: 8 ms
        MOTOR STARTING TIME: 15 sec
             ROTATION SPEED: 3400 rpm
               HEAD PARKING: Automatic
                TEMPERATURE
                  OPERATING: 41 to 131'F
              NON-OPERATING: -40 to 140'F
                   HUMIDITY
                  OPERATING: 8 to 80% RH non-condensing
           MAXIMUM WET BULB: 79'F
              NON-OPERATING: 8 to 80% RH non-condensing

Power Supply Bulletin:

Your TANDY 2500 RSX computer contains a 100-watt power supply, not the
70-watt power supply listed in the user's guide.

* 105 to 135 VAC, 60 Hz (US)
* 2.6 amps maximum current drain


Deskmate Addendum:

DeskMate and the AUTOEXEC.BAT File:

Each time you install application software onto your hard drive, check the
accompanying software documentation to see whether the installation
procedure modifies the AUTOEXEC.BAT file on the hard drive. If the
installation procedure adds an executable file or a command to
AUTOEXEC.BAT, you may have to modify AUTOEXEC.BAT after installing the
application software. It is essential that the DeskMate command DESK remain
the last executable file or command in AUTOEXEC.BAT. Otherwise, other
executable files will not load as they should.

DeskMate Sound and a CD Player:

If your computer has a CD player installed, remember that some applications
in DeskMate search all storage drives - including the disc in your CD
player. (Diary and Home Organizer are two such applications.) If you are
listening to an audio CD while executing one of these applications, your CD
operation will be interrupted.

DeskMate and Sound Blaster:

If you have an audio board installed in your computer, be sure the
interrupt request assignment for sound is configured properly.  The
interrupt for some non-MPC MS-DOS Sound Blaster applications is IRQ 7.
(Refer to your application documentation and your audio adapter
documentation for more information.) When you have DeskMate on your
computer and use IRQ 7 for other applications, DeskMate sound has
operational difficulties. To avoid conflicts with DeskMate sound, disable
the Desktop sound and do not run DeskMate's music or sound applications.

NOTE: This conflict can occur with any board or option you install that
uses IRQ 7. Refer to the device documentation.