SmartDrive XT/AT  (250-1048)      Jumper Settings      Faxback Doc. # 3076

NOTE: The SmartDrive does not require low-level formatting. The drive is 
low-level formatted at the factory.  If the drive is ever accidentally
low-level formatted, it should be sent to service for re-factorization.

              25-1048 - ST-351A/X - 9 JUMPER SETS

COMPUTER                                       JUMPER SETTINGS

XT W/ON BOARD IDE CONTROLLER                        2,5,9

AT W/ON BOARD IDE CONTROLLER - SINGLE DRIVE         2,6,9

AT W/ON BOARD IDE CONTROLLER - 2 DRIVES - MASTER    2,3,6,9

AT W/ON BOARD IDE CONTROLLER - 2 DRIVES - SLAVE     4,6,9

XT/AT W/25-1088                                     2,5,6,8

XT/AT W/25-1095                                     2,6,9

              25-1048 - ST-351A/X - 6 JUMPER SETS

COMPUTER                                           JUMPER SETTINGS

XT W/ON BOARD IDE CONTROLLER                       1,4,6

AT W/ON BOARD IDE CONTROLLER - SINGLE DRIVE        1,6

AT W/ON BOARD IDE CONTROLLER - 2 DRIVES - MASTER   1,2,6

AT W/ON BOARD IDE CONTROLLER - 2 DRIVES - SLAVE    6

XT/AT W/25-1088                                    1,3,4, ALSO JUMP
                                                   THE BOTTOM PIN OF
                                                   JUMPER SET 5 TO
                                                   THE BOTTOM PIN OF
                                                   SET 6

XT/AT W/25-1095                                    1,6

SETTING THE JUMPERS

The SmartDrive has nine pair of jumper pins, which are located at the rear
of the drive, on the right side.  Jumper pair one is closest to the 
connectors on the rear of the drive.

A jumper is a clip that contains metal contacts. To install a jumper,
place it over two adjacent pins. This installation connects or bypasses a
circuit, enabling or disabling a function of the drive. A jumper can be
installed or removed as shown.

Decide which drive configuration is best for your system. Refer to the
table to install the appropriate jumpers.

If you have a PC/XT-compatible computer, such as a Tandy 1000 family
computer, you do not need to change the settings of any jumpers.  Make
sure the jumpers are set to the FACTORY SETTINGS and Proceed to the
"Installation" section.

This information is for the 9 pin Smartdrive....

┌─────────────────────────────┬──────────┬───────────────────────────────┐
│  FUNCTION                   │ JUMPERS  │         SETTINGS              │
├─────────────────────────────┼──────────┼───────────────────────────────┤
│Reserved for factory use     │    1     │         Removed *             │
├─────────────────────────────┼──────────┼───────────────────────────────┤
│Drive selection              │    2     │         Installed=primary *   │
│                             │          │         Removed=secondary +   │
├─────────────────────────────┼──────────┼───────────────────────────────┤
│                             │    3     │         Installed=secondary + │
│                             │          │         Removed=primary *     │
├─────────────────────────────┼──────────┼───────────────────────────────┤
│Reserved for factory use     │    4     │         Removed *             │
├─────────────────────────────┼──────────┼───────────────────────────────┤
│Interface selection          │    5     │         Installed=XT interface│
│                             │          │         Removed=AT interface *│
                              ┼──────────┼───────────────────────────────┤
│                             │    6     │         Installed=AT interface│
│                             │          │         Removed=XT interface *│
├─────────────────────────────┼──────────┼───────────────────────────────┤
│Reserved for factory use     │    7     │         Removed *             │
├─────────────────────────────┼──────────┼───────────────────────────────┤
│Reserved for factory use     │    8     │         Removed *             │
├─────────────────────────────┼──────────┼───────────────────────────────┤
│Reserved for factory use     │    9     │         Installed *           │
├─────────────────────────────┼──────────┼───────────────────────────────┤
│* Indicates factory setting. │          │         + Not applicable in an│
│                             │          │           XT-type computer.   │
└─────────────────────────────┴──────────┴───────────────────────────────┘

Following are some samples of common configurations, with representative 
computer models in parenthesis:

┌──────────────────────────────────────┬───────────────────────────────┐
│Primary XT Drive (Tandy 1000 RL) *    │    No changes.                │
├──────────────────────────────────────┼───────────────────────────────┤
│Primary AT Drive (Tandy 2500)         │    Remove Jumper 5            │
│                                      │    Install Jumper 6           │
├──────────────────────────────────────┼───────────────────────────────┤
│Secondary AT Drive (Tandy 4020 SX)    │    Remove Jumpers 2 and 5.    │
│                                      │    Install Jumpers 3 and 6.   │
├──────────────────────────────────────┴───────────────────────────────┤
│* Note that you can not daisy chain SmartDrives in PC/XT compatible   │
│  computers, such as Tandy 1000 family computers.                     │
└──────────────────────────────────────────────────────────────────────┘

(rjs/tmc-03/20/95)