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Amiga Technical References

GVP A3001 Series II Accelerators

68030 CPU Board REV7 Jumper Settings

Jumper  Default    Description
J1      Shorted    Reserved for future use
J2      OPEN       Reserved for future use
J4      OPEN       Connects 68882 FPU to oscillator US when shorted
J5      SHORTED    Connects 68882 FPU to oscillator U1 when shorted
J6      OPEN       Disables 68030 MMU when shorted
J7      ---->>     OPEN for 50MHz clock speed and SHORTED for lower
                   clock speeds
J9      SHORTED    Remove this jumper to enable the 68030 Boot code EPROMS
                   (U23 and U25) when these are installed
J10     SHORTED    A2000 Motherboard type. Shorted for A2000 motherboards
                   REV4.0 and up (type B2000) Open for original 4-layer
                   German motherboard. When this jumper is left open the
                   68000 CPU must be removed.
J11     OPEN       Disables 68030 CPU and bootup in 68000 mode when shorted
J12     OPEN       SHORT to change clocking mode for compatibility with old
                   German A2000 motherboard
J13     OPEN       SHORT to change clocking mode for compatibility with old
                   German A2000 motherboard
J14     SHORTED    OPEN to change clocking mode for compatibility with old
                   German A2000 motherboard
J15     SHORTED    OPEN to DISABLE the code contained in the Autoboot
                   EPROM (U34)
J16     SHORTED    Reserved for diagnostic use
J17     SHORTED    Set size of EPROM being used for "AT" Autoboot EPROM (U34)
                   SHORTED for 27256 type and OPEN for 27128 type
J18     SHORTED    OPEN when an "AT" hard drive is connected to enable the
                   "AT" driver code in the Autoboot EPROM (U34). This jumper
                   is only relevant when using Autoboot EPROM v3 or later.

NOTE: J10, J12, J13 and J14 are a set and must be changed over at the same
      time when installing into an A2000 with an old 4-layer German board.
      68000 CPU must also be removed at the same time.


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