Settings and add-on modules
Processor type and processor speed
There are three sockets on the system board for the processor:
– U1 - the processor is inserted
– U2 - the processor is inserted (upgrade)
– U3 - the processor is soldered onto the board
Depending on the processor type used, the U-plugs JP1 to JP3 are inserted
differently. Depending on the processor speed, the U-plugs JP5 and JP6 are
inserted differently.
Processor type /
U-plug assignment of
speed
JP1 JP2 JP3 JP5 JP6
80486
SX
/ 25 (U3)
1-2
2-3
inserted
inserted
---
80486
SX
/ 33 (U3)
1-2
2-3
inserted
---
inserted
80486
SX
/ 33 (U1)
---
1-2
---
---
inserted
80486
DX
/ 33 (U1)
1-2
2-3
inserted
---
inserted
80486
DX2
/ 50 (U1)
1-2
2-3
inserted
inserted
---
80486
DX2
/ 66 (U1)
1-2
2-3
inserted
---
inserted
--- = not inserted
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Settings and add-on modules
Upgrading
You can upgrade the system board by simply plugging in the processor.
!
Note the mounting location of the chip when you plug in the new processor!
If you upgrade a 33 MHz processor with a coprocessor or OverDrive
processor for 25 MHz, you must pull the JP6 U-plug and insert the JP5 U-
plug.
U2
1
2
1 = Mark on socket
2 = Mark on the top of the processor
Insert the new processor in such a way that the mark on the processor matches
the mark on the socket.
Upgrading a 80486
SX
/25
Insert the 80487
SX
-25 coprocessor or the OPD486-25 OverDrive processor in
the U2 socket.
Upgrading a 80486
SX
/33
Plug the OverDrive processor OPD486-33 into the upgrade socket U2.
Upgrading a 80486
DX
/33
Plug the OverDrive processor OPD486-33 into the upgrade socket U2.
For other upgrade options, please contact our customer service.
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