Specifications.

[pintos-anon] / specs / kbd / scancodes-4.html
diff --git a/specs/kbd/scancodes-4.html b/specs/kbd/scancodes-4.html

new file mode 100644 (file)

index 0000000..7c058e6
--- /dev/null
+++ b/specs/kbd/scancodes-4.html
@@ -0,0 +1,41 @@
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
+<HTML>
+<HEAD>
+ <META NAME="GENERATOR" CONTENT="SGML-Tools 1.0.9">
+ <TITLE>Keyboard scancodes: Special keyboards - AT keyboards</TITLE>
+ <LINK HREF="scancodes-5.html" REL=next>
+ <LINK HREF="scancodes-3.html" REL=previous>
+ <LINK HREF="scancodes.html#toc4" REL=contents>
+</HEAD>
+<BODY>
+<A HREF="scancodes-5.html">Next</A>
+<A HREF="scancodes-3.html">Previous</A>
+<A HREF="scancodes.html#toc4">Contents</A>
+<HR>
+<H2><A NAME="s4">4. Special keyboards - AT keyboards</A></H2>
+
+<P><I>The AT keyboard adds a keyboard controller.
+The numeric keypad is now separated from the main keyboard.
+There is a single new key, with scancode 84 = <B>54</B>,
+namely SysRq.</I>
+<P>The protocol for AT and later keyboards differs from that for
+XT keyboards. Some old keyboards have an XT/AT switch on the
+backside that selects the appropriate protocol.
+Other keyboard autodetect XT or AT mode.
+<P>
+<FIGURE>
+<EPS FILE="absent">
+<IMG SRC="xt-at-switch.jpg">
+</FIGURE>
+<P>
+<P>The KeyTronic KB101-1 keyboard has four switches of which the first two
+indicate the desired behaviour (00 - autodetect, 01 - unused,
+10 - PC/XT, 11 - AT). Autodetect does not always work.
+<P>
+<P>
+<HR>
+<A HREF="scancodes-5.html">Next</A>
+<A HREF="scancodes-3.html">Previous</A>
+<A HREF="scancodes.html#toc4">Contents</A>
+</BODY>
+</HTML>