IBM 37L1415 Installation Manual page 2

Overview
IBM Serial I/O Adapters are intelligent, high-speed (up to 230.4
kbps on each port) Multiport Boards providing high performance
serial I/O solutions for PCI bus systems. All port interfaces are
standard RS-232 with full modem control and voltage surge
protection on every pin.
IBM Serial I/O Adapters appear to the system host processor as
memory. That is, they are memory mapped devices. Each Adapter is
automatically mapped into system memory at the time of device
driver installation. The device driver soft-configures all adapters
each time the system is initialized (booted). See the Software
Reference Manuals located on the CD ROM for detailed Device Driver
information.`
The IBM Serial I/O Adapter (see Figure 1 below) occupies a single
PCI slot in the host computer and provides the intelligent functions
to "off-load" the CPU serial communications processing tasks.
Figure 1. Serial I/O SST16P Adapter
IBM Serial I/O SST-16P Installation Guide 2
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