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-rw-r--r--syslinux.doc1
1 files changed, 1 insertions, 0 deletions
diff --git a/syslinux.doc b/syslinux.doc
index ffa3884f..3a064858 100644
--- a/syslinux.doc
+++ b/syslinux.doc
@@ -225,6 +225,7 @@ SERIAL port [[baudrate] flowcontrol]
Typical values are:
0 - No flow control (default)
+ 0x303 - Null modem cable detect
0x013 - RTS/CTS flow control
0x813 - RTS/CTS flow control, modem input
0x023 - DTR/DSR flow control