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Everything You Always Wanted To
Know
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Amiga Technical References
GVP A3001 Series II Accelerators68030 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.