Philips CD-I - Page 100

2. Software specifications
The elements included in the Expansion module are:
o 2 Floppy disk drives, high density
o Printer interface
o RS-232C interface
o Extension board for 1 MB RAM extension
o Extension board with SCSI interface
From the system point of view, these elements are
treated as CD-I extensions. It is essential for each
CD-I extension to make available to the system its own
Device Status Descriptor (DSD), device driver and file
manager (if applicable). This data will reside in the
Expansion Module.
2.1 Floppy disk drive.
The floppy disk drive is classed as a CD-IX
peripheral, as described in Appendix VII.2,
of the CD-I Full Functional Specification.
Conforming to the recollllJlendation, a 3.5 inch
floppy disk drive is used. The standard OS-9
disk format is used.
2.2 Printer interface.
The interface will be used for a printer.
2.3 RS-232C interface.
This serial, bi-directional interface is
designed for a modem or printer, or as a port
to another data processing system.
2.4 Two slots for extension boards.
All extension boards can be connected to
either slot, and have their connections and
physical interfaces on their front panels.
They also all have their own system ROM,
comprising Configuration Status Descriptor
information, with relevant managers, drivers
and user interface software.
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