20 Meg Hard Disk Card  (250-1032B)      Settings        Faxback Doc. # 3019

The 25-1032A /B all 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.

    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 1000SL SL/2 TL TL/2 TL/3 1200
Same as for 3000/4000 series with the exception of S1-8
should be open (not jumped).  SEE BELOW

JUMPER SETTINGS FOR 3000/4000 SERIES

    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 BUS)

*S1-8            1200/1000SL/TL series (Not Jumped = XT bus)

In the 1000 series computer, 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) they are however,
listed below for your own information.

Termination is an 8 pin sip (one long pin) located behind the 34 pin
CONTROL cable connector on the hard drive main logic board must be terminated
(pin 1 installed closest to the edge of drive) on the Tandy series computers.

Drive select jumpers on the drive logic board are behind the 20 pin data
cable.  The one closest to the center is W1.

(dkh-05/05/93)