* bus/hp9845_io: Added HP9871 printer.
New working machines
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Hewlett-Packard HP 9825A
Hewlett-Packard HP 9831A
New working software list items
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hp9825_rom: 9862 Plotter/Gen I/O ROM for 9825
hp9825_rom: General/extended I/O ROM for 9825
hp9825_rom: General/extended I/O/9862 plotter ROM for 9825
hp9825_rom: General/extended I/O/plotter ROM for 9825
hp9825_rom: Plotter/Gen I/O ROM for 9825
hp9825_rom: String/Advanced programming ROM for 9825
hp9831_rom: Mass storage ROM for 9831
New not working software list items
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hp9831_rom: Matrix/plotter ROM for 9831
