Amiga 4000 Desktop Jumper Settings

Fucntion:            Jumper:    Setting:   Description:
CLK90 Clock Source   J100:1-2   X-X X      Internal (020/030)
                     J100:2-3   X X-X      External (040)

CPU Clock Source     J104:1-2   X-X X      Internal
                     J104:2-3   X X-X      External

ROM Speed            J151:1-2   X-X X      200ns
                     J151:2-3   X X-X      160ns

CHIP RAM Size        J213:1-2   X-X X      2 Meg
                     J213:2-3   X X-X      8 Meg (yeah right)

Enable Second        J351:1-2   X-X        No Second internal floppy drive
Internal Floppy                            or 1.76MB floppy drive
                     J351:      X X        Enable second internal floppy drive
                                           880k as DF1:

Redirect DF0:        J352:1-2   X-X X      Internal: DF0: and DF1: internal
                                                     DF2: and DF3: external
                                           External: DF2: and DF1: internal
                                                     DF0: and DF3: external

Enable DSACK         J850:1-2   X X        DSACK enable. Required if CPU is a
                                           68020. Also requires U860 and U152.
                     J850:1-2   X-X        No DSACK.

RAM Size             J852:1-2   X-X X      RAM size 1 Meg x 32
                     J852:2-3   X X-X      RAM size 256k x 32

Select NTSC/PAL      J212:1-2   X-X X      Select NTSC
                     J212:2-3   X X-X      Select PAL

VBB\MA10             J214:2-3   X X-X      Supplied VBB to ALICE
                     J214:1-2   X-X X      ALICE supplies MA10 for 8 Meg CHIP
                                           (NO it DOESN'T WORK!)

Select Sync on Green J500:1-2   X-X X      Sync on Green Disabled
                     J500:2-3   X X-X      Sync on Green Enabled

LISA Sync            J501:2-3   X X-X      Default

Select DAC Sync      J502:1-2   X-X X      DAC Syncs on Green
                     J502:2-3   X X-X      DAC used standard signal

BACK TO MAIN TECHNICAL PAGE

TO CATALOG

BACK TO NATIONAL AMIGA