167 lines
3.1 KiB
HTML
167 lines
3.1 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<HTML
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><HEAD
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><TITLE
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>Controllers (I/O)</TITLE
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><META
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK
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REL="HOME"
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TITLE="Linux Hardware Compatibility HOWTO"
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HREF="index.html"><LINK
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REL="PREVIOUS"
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TITLE="IDE RAID Controllers"
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HREF="ideraid.html"><LINK
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REL="NEXT"
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TITLE="Controllers (multiport)"
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>Linux Hardware Compatibility HOWTO</TH
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><A
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NAME="IO"
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></A
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>11. Controllers (I/O)</H1
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><P
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> Any standard serial/parallel/joystick/combo cards. Linux
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supports 8250, 16450, 16550, and 16550A UART's. Cards that support
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non-standard IRQ's (IRQ > 9) can be used.
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</P
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><P
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> See National Semiconductor's ``Application Note AN-493'' by
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Martin S. Michael. Section 5.0 describes in detail the
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differences between the NS16550 and NS16550A. Briefly, the
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NS16550 had bugs in the FIFO circuits, but the NS16550A (and
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later) chips fixed those. However, there were very few NS16550's
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produced by National, long ago, so these should be very rare.
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And many of the ``16550'' parts in actual modern boards are from
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the many manufacturers of compatible parts, which may not use
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the National ``A'' suffix. Also, some multiport boards will use
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16552 or 16554 or various other multiport or multifunction chips
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from National or other suppliers (generally in a dense package
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soldered to the board, not a 40 pin DIP). Mostly, don't worry
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about it unless you encounter a very old 40 pin DIP National
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``NS16550'' (no A) chip loose or in an old board, in which case
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treat it as a 16450 (no FIFO) rather than a 16550A. - Zhahai
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Stewart <<TT
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CLASS="LITERAL"
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> <A
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HREF="mailto:zstewart@hisys.com"
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TARGET="_top"
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> zstewart@hisys.com</A
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></TT
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>>
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</P
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>Prev</A
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>IDE RAID Controllers</TD
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><TD
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WIDTH="34%"
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ALIGN="center"
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> </TD
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><TD
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WIDTH="33%"
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ALIGN="right"
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VALIGN="top"
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>Controllers (multiport)</TD
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></TR
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></TABLE
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></DIV
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></BODY
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> |