Switch and Jumper Settings for the SupraDrive 500XP (late model)


Switches (bottom rear on right side panel):

     SW1 SW2 SW3  binary device number of internal SCSI drive.  Down=0, Up=1
      0   0   0   device 0
      1   0   0      "   1
      0   1   0      "   2
      1   1   0      "   3
      0   0   1      "   4
      1   0   1      "   5
      0   1   1      "   6
      1   1   1   not allowed (SupraDrive interface's own device number)

     SW4:  AutoBoot switch.  Down=Enabled, Up=Disabled.
           For KS 1.2 and below, this switch MUST be "UP" (Autoboot disabled)

     SW5:  FastRAM switch.  Up=Enabled, Down=Disabled (Test mode).
           To run old games that must boot from floppy, but don't like
           FastRAM, flip this switch DOWN before powering up (or re-boot).

Game switch:  (Rear panel, on left [as "viewed/felt" from the front])
              Down=hard disk DISabled, Up=hard disk ENabled.
              For games which don't like hard disks, flip switch DOWN
              before powering up.


Jumpers J1 - J3:  (Inside case at left rear.  J3 is rearmost.)

     Memory installed:     J1 J2 J3  (0=jumper removed, 1=jumper installed)
     -----------------     -- -- --
            0               0  0  0

If using 256Kx4 DRAMs:

          512KB             0  1  1
           1MB              0  1  0
           2MB              0  0  1

If using 1Mx4 DRAMs:

           2MB              1  0  1
           4MB              1  0  0
           8MB              1  1  1


Jumpers J5, J6:
    Located near interface connector, visible through cutout in top
    cover.

    These jumpers connect +5V and +12V power to the internal disk drive
    power connector when not using an external power supply.

    If you are using an external power supply, you MUST remove these
    jumpers.


Internal termination connector RP5:
    This is a 16-pin DIP socket located inside the SupraDrive at the
    center rear of the unit between the internal 50-pin ribbon-cable
    connector and the external DB25 connector.

    If no hard disk (with its own terminating resistors) is installed
    inside the SupraDrive, then a 220/330-ohm resistor network must be
    installed in this socket to properly termination of the SCSI bus.


The SupraDrive 500XP can use the same power supply as the A590 hard
disk/RAM unit.  I have seen these PS units available from Paxtron Corp.

If you want to hack your own supply, the pin-out of the 4-pin DIN
is as follows:

    Looking into rear of SupraDrive unit:

        u
      4   1
       3 2

    u = keyway
    1 = +5V
    2 = ground
    3 = power sense
    4 = +12V

    "power sense" is always connected to the +5V supply from the Amiga.
    It is used by the A590 and similar power supplies to turn on auto-
    matically whenever the Amiga main unit has been powered up.  If you
    are rolling your own power supply from a PeeCee unit, leave this
    unconnected and just turn on both the Amiga and your supply at the
    same time.

    If you use the external power supply, you MUST remove jumpers J5
    and J6 which are accessible through the cutout near the 86-pin
    edge connector.