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Imprimir páginaAM-990 SBC Computer Service Manual
SBC AM-145 CPU BOARD
The AM-145 is a 33Mhz main logic board available for the SBC. Most of the AM-145
specifications are covered in Appendix A in the owner's manual; however, the following
list highlights some of the key features on the AM-145 board:
Memory expansion up to 16 megabytes.
I/O expansion up to 34 serial ports.
On-board floppy controller.
68020 Processor chip.
The sections that follow include information on user configurable options for the AM-145
board.
Most of the jumpers on the AM-145 board are factory configured and should not be
moved. Only the features discussed in the next sections have jumpers that are user
configurable.
Remote Reset Capability
As discussed in Appendix B in the owner's manual, it is possible to reset the SBC
remotely through serial I/O Port "0." If properly configured, you can use a push button
switch to short Pin 1 in that connector to Pin 7 (Signal Ground), resetting the computer.
To enable remote reset, you must install a shorting block in the REMOTE RESET
position on the SBC main logic board. See the illustration.
Serial I/O Port Configuration
Ports 0 and 1 on the SBC are factory configured for RS-232 compatibility. You can
configure either or both of these ports for RS-422 compatibility if desired. For each port,
three jumpers on the main logic board control whether it is set for RS-232 or RS-422
compatibility. You must set all three to either 232 or 422. For Port 0, the jumpers are
W3, W4 and W5; for Port 1, they are W6, W7 and W8.
Configuring SBC Memory
There are four connectors designed for SBC memory expansion; J5, J6, J7, and J8.
The memory expansion board is called the AM-715-10 and has four megabytes of
memory. The maximum memory capacity of 16 megabytes is achieved by installing four
memory boards.
See the AM-715 Memory Board Installation Instructions , for detailed information on
installing memory boards.
DSS-10524-00, Rev. A01
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