Specifications
Page 29Installation Instructions: Roadrunner 030 & 040 AM-1000 / AM-1200 Upgrade
12.034-PIN X-BUS CABLING PRECAUTIONS
Up to this point, the installation instructions for AM-172 and AM-174 Roadrunner boards
have been exactly the same. However, the installation of the 34-pin X-bus cables is
not the same. This difference becomes important in configurations where an AM-172
(030 based) Roadrunner board is being replaced with an AM-174 (040 based) board. If
you remove your Roadrunner 030 board and replace it with an 040 board and then plug
the X-bus cables into the 040 board exactly as they were in the 030 board, your
computer will not boot. If you are performing an 030 to 040 upgrade, completely
remove both 34-pin X-bus cables from your computer and reinstall them using the the
X-bus cabling instructions for the Roadrunner (AM-174) 040 board.
The next figure shows how the two 34-pin cables are routed over the top of your
AM-177 or AM-167 board. In order that the cables not interfere with the fit of the
computer’s top cover, the cables must be routed under the metal frame that stiffens the
AM-167 or AM-177 board as shown. Connect both 34-pin cables to the AM-985 board
now. Make sure the embossed arrow (indicating pin 1) on the cable connectors aligns
with pin-1 on the AM-985 connectors.
12.1AM-172 to AM-985 X-bus Cabling Instructions
The AM-985 and AM-172 boards are linked together with two 34-pin cables, which you
were instructed to connect to the AM-985 board previously. One of the cables connects
the P2 connector on the AM-985 board to the J5 connector on the AM-172 board; the
other cable connects the P1 connector on the AM-985 board to the J6 connector on the
AM-172 board. Since you have already connected the two 34-pin cables to the AM-985
board, it is now simply a matter of routing the cables as shown on the following figure
and connecting them to the AM-172 board.
When plugging in the two cables, make sure the embossed arrow (which indicates
pin-1) on the connectors align with the pin-1 indicators on both the AM-172 and AM-985
boards. The section dealing with circuit board configuration contains illustrations
indicating pin-1 locations for AM-985, AM-172, and AM-174 boards.
No power is conducted over either of the two 34-pin cables, so no damage will occur if
you accidentally reverse these cables. However, if the cables are not plugged in
correctly, the system will not boot or run self-test. If your computer does not boot after
doing the upgrade, double check your cable connections.
PDI-00172-10, Rev. A03