20 Meg Hard Disk Card  (250-1029A/B)     Settings      Faxback Doc. # 3007

    ┌─────────────────────────────────────────────────────────────────────┐
    │       ┌──────┐             ┌────────────────────────┐               │
┌───┘  J2   └──────┘         J1  └────────────────────────┘               │
│           ┌──────┐                                               1 2 3  │
│      J3   └──────┘               o 1                         W8  o o o  │
│                              W6  o 2                         W4  o o o  │
│                                  o 3                                    │
│                                                             pin 5  o o  │
│                                                             pin 6  o o  │
│                                                             pin 7  o o  │
│                                                    SW1      pin 8  o o  │
│                                                             pin 4  o o  │
│                 W3  o 1                                         3  o o  │
│                     o 2                                         2  o o  │
│                                                                 1  o o  │
└───┐                          W7 1 2 3                                ┌──┘
    │                             o o o                                │
    └──────────────────────────────────────────────────────────────────┘

The 25-1029 /A/B Use the Western Digital hardcard controller stock #
WD1002A-WX1 and comes configured for use in the Tandy 1000 /A/SX/TX.  The
jumpers should be confirmed correct for the computer it is to be installed
in.

JUMPER SETTINGS FOR THE TANDY 1000 /A/SX/TX.

    LOCATIONS     PINS        FUNCTION

    W3            jumpered    Enable 64K BIOS ROM
    W4            2-3         I/O port 320
    W5            unused      Trace between 1 and 2 is installed
    W6            1-2         RWC Disable
    W7            2-3         IRQ 2, S1-7 must be on
    W8            2-3         BIOS address C800hex

    S1-1            Jumper installed
    S1-2            Jumper installed
    S1-7            IRQ 2, W7 must be jumped 2-3

All other S1 jumpers are not installed when used on the Tandy 1000/A/SX/TX.

JUMPER SETTINGS FOR THE TANDY 1200 1000SL /TL /SL2 /TL2 /TL3:

Use the same settings as with 3000/4000 series except S1-8.  S1-8 will need
to be removed (no jumper) for 8 bit XT style bus.  See jumpers listed
below.

JUMPER SETTINGS FOR THE TANDY 3000/4000 SERIES

    LOCATION      PINS        FUNCTION

    W3            jumpered    Enable 64k BIOS ROM
    W4            2-3         I/O port 320
    W5            unused      Trace between 1 and 2 is installed
    W6            1-2         RWC Disable
    W7            1-2         IRQ 5, S1-7 must be off
    W8            2-3         BIOS address C800Hex

    S1-1            Jumper installed
    S1-2            Jumper installed
    S1-8            3000/4000 Host Computer JUMPER ON = AT STYLE BUS

*S1-8           1200/1000 SL TL SERIES JUMPER OFF = XT STYLE BUS

All other S1 jumpers are not installed when used on the Tandy 3000/4000

SECONDARY DRIVE INSTALL PROCEDURES:

In the 3000/4000 series computer when a second Hardcard is to be installed,
jumper the second controller card according to the above settings with the
following exceptions:

    LOCATION      PINS        FUNCTION

    W4            1-2 jumped  I/O port 324
    W8            1-2 jumped  BIOS address CA00Hex

* NOTE: In the 1000 series computers, two hardcards are NOT supported

The below listed hardcard Logic Board jumpers in most cases are not needed
as drive comes configured for your Tandy computer (default).

 VERSION 1               VERSION 2                   VERSION 3
 J12 All open            J12 All open                J12 All open
 J13 CB Jumpered         J13 CB Jumpered             J13 Open
 J15 Jumpered            J15 Jumpered                J15 Closed
 J17 Jumpered            J19 Jumpered
 J18 1-2                 J17 Jumpered
 J19 Open                J21 1-2 Jumpered

OPEN=OFF
CLOSED=ON

Where "open/off" applies to switches not jumpers.

(dkh/BKL-03/14/96)