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TT12.002
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1991-08-26
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931b
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42 lines
American Megatrends, Inc.
Tech Tip #12.002
02/06/91
Problem:
Jumper J12 on AMI Voyager 25/33MHz motherboards is used to control
I/O / memory wait states. We do not have a description of this
jumper in the Voyager manual.
Pin description for jumper J12:
This is the edge of the board
-----------------------------
1 o-----o 2
3 o-----o 4
5 o-----o 6
7 o-----o 8
Pin Pair 1-2:
This pin controls the memory wait states for banks one and two.
This jumper should be installed for 25/33 MHz operation.
Pin Pair 3-4 / Pin Pair 5-6
These two pin pairs are used as follows:
Pin Pair 3-4 Pin Pair 5-6 Comment
Open Open CPU-25MHz
Shorted Open CPU-33MHz
Open Shorted Reserved
Shorted Shorted Reserved
Pin Pair 7-8 is not used at this time.
The default setting for J12 is:
25MHz: Pin Pairs 1-2 installed
33MHz: Pin Pairs 1-2 & 3-4 installed