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AM-990 SBC Computer Service Manual
If your computer includes an AM-522 ESDI controller board, the maximum memory
capacity is reduced to 12 megabytes. The AM-522 board requires one of the memory
expansion slots for installation.
SBC Expansion I/O
The AM-145 board has one 60-pin connector, located at J9, designed to support a
maximum of 32 serial ports. These ports are in addition to the two standard AM-145
serial I/O ports (0 and 1) shown in the illustration.
AM-355 I/O boards attached to connector J9 use the same interface driver used by the
two serial ports on the CPU board, AM145.IDV. AM-358 and AM-359 I/O paddle cards
connected to the AM-355 I/O bus use the interface drivers called AM358.IDV and
AM359.IDV. Other types of boards designed to be used on the AM-355 I/O bus have
their own unique drivers.
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
