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AM-990 SBC Computer Service Manual

If you are going to mix 4MB and 16MB memory boards in your SBC, make sure you

install the 16MB boards first followed by the 4MB memory boards.

SBC Expansion I/O

There are two 60-pin connectors on the SBC CPU board, each capable of supporting 32

serial ports. The first 32 ports are controlled by connector J7 and the second 32 ports

are controlled by connector J8.

Connector J7 supports the standard interface drivers for all of Alpha Micro's paddle card

devices designed for the AM-355 I/O bus. AM-355 I/O boards attached to connector J7

use the same interface driver used by the two serial ports on the CPU board,

AM140.IDV. AM-358 and AM-359 I/O paddle cards, and any other AM-355 I/O bus

paddle cards attached to the J7 connector will use the drivers designed for those

specific devices. For example: AM358.IDVand AM359.IDV.

The J8 connector ONLY supports AM-355, AM-358, and AM-359 I/O paddle cards.

AM-355, AM-358 and AM-359 I/O paddle cards attached to connector J8 use special

interface drivers: AM355B.IDV, AM358B.IDV and AM359B.IDV.

For information on jumper settings, port numbering, and I/O addresses, see the

installation guide shipped with the AM-355 I/O bus device you are installing.

DSS-10524-00, Rev. A01

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