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authortmk <nobody@nowhere>2011-02-13 23:02:08 +0900
committertmk <nobody@nowhere>2011-02-13 23:02:08 +0900
commita96085faf6afec5362bef7206cb500d9aae21362 (patch)
treef8abd7a433b3e99ace4390b7a526b112fe3b2a5e /adb
parent5bc29b50ef48196dcd5459287d8d6c91b759c83b (diff)
added note about external pull resistor on DATA line.
Diffstat (limited to 'adb')
-rw-r--r--adb/README4
1 files changed, 4 insertions, 0 deletions
diff --git a/adb/README b/adb/README
index d6c9ec9aa4..b4bd35bb33 100644
--- a/adb/README
+++ b/adb/README
@@ -8,6 +8,10 @@ This firmware converts ADB keyboard protocol to USB.
Build
-----
0. Connect ADB keyboard to Teensy by 3 lines(Vcc, GND, Data).
+ You need a external pull-up resistor on DATA line in most case,
+ in particular when you want to use a long or coiled cable.
+ This converter uses AVR's internal pull-up, but it seems to be too weak.
+ The external pull-up resistor is strongly recommended.
PSW line is optional. See ADB.txt for details.
1. Define following macros for ADB connection in config.h:
ADB_PORT