Eagle Series Computer Service Manual
Page 13
DSS-10517-00, Rev. B01
Roadrunner AM-172 Board Configuration
The illustration below shows the AM-172 board configured as shipped by Alpha Micro. The only user-
configurable jumpers on this board are the JP5 and JP6 memory configuration jumpers. These jumpers
only need to be reconfigured if you change the amount of memory installed in your computer. All other
jumpers on the board should be left in their factory-configured positions. All possible configurations for
the memory jumpers are shown in the illustration.
N C R
030
ALPHA
MICROSYSTEMS
DWB-00172-00 REV. XXX
JP4
JP16
JP15
JP17
JP18
JP3
JP1
JP2
J2
J3
J5
J6
J1
JP1
1
2
3
JP1 SET TO PINS 1 AND 2 = TERMPOWER DISABLED
JP1 SET TO PINS 2 AND 3 = TERMPOWER ENABLED (FACTORY DEFAULT)
JP2
JP2 SET TO PINS 1 AND 2 = SCSI BUS ACTIVE TERMINATION ENABLED (FACTORY DEFAULT)
JP2 SET TO PINS 2 AND 3 = SCSI BUS ACTIVE TERMINATION DISABLED
1 2 3
JP6
JP5
JP19
JP6
JP5
JP6
JP5
JP6
JP5
4MB
8MB
16MB
MEMORY CONFIGURATION
JUMPERS
OSCILLATOR JUMPER (DO NOT REMOVE)
CACHE ENABLE / DISABLE JUMPER
IN = DISABLED
OUT = ENABLED (FACTORY DEFAULT)
TEST JUMPER (DO NOT INSTALL)
OSCILLATOR JUMPERS
(DO NOT REMOVE)
TEST JUMPER
(DO NOT INSTALL)
X-BUS
CONNECTORS
50-PIN SCSI
CONNECTOR
BOOT PROM
MEMORY SIMM CONNECTOR
X-BUS ACTIVE TERMINATION
IN = ENABLED (FACTORY DEFAULT)
OUT = DISABLED
INDICATES PIN-1
FOR ALL CONNECTORS
JP6
JP5
32MB
PIN-1 INDICATOR
AM-172 Board Configuration
