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Amiga Technical References

Commodore A3630 and A3640 Jumper Settings


Function:            Jumper:    Setting:   Description:

FPU Select PLCC/PGA  J100:1-2   X-X X      Use FPU in PLCC location
                     J100:2-3   X X-X      Use FPU in PGA location

FPU Clock            J100:1-2   X-X X      Use optional on-board oscillator (U103)
                     J100:2-3   X X-X      Use CPU clock

MAPROM Enable        J103:1-3   X-X X      MAPROM Enabled
                     J103:2-3   X X-X      MAPROM Disabled

68020 Selected       J201:1-2   X-X X      68020 Not Selected
                     J201:2-3   X X-X      68020 Selected

68030 Selected       J202:1-2   X-X X      68030 Selected
                     J202:2-3   X X-X      68030 Not Selected

020/030 Select       J203:1-2   X-X X      68030 Selected
                     J203:2-3   X X-X      68020 Selected


Function:            Jumper:    Setting:   Description:
Enable *CDIS *MDIS   J100:1-2   X-X X X    Enable CDIS* MDIS*
                     J100:3-4   X X X-X    Enable CDIS* MDIS*
                                          (close both sets of jumpers)

Enable MAPROM        J400:1-2   X-X X      MAPROM Enabled

                     J400:2-3   X X-X      MAPROM Disabled

Test                 TJ100:1-2  X-X        Test jumper

Copyright 2000 Amiga Auckland Inc. All rights reserved.
Revised: June 16, 2005.