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--- a/comboot.doc
+++ b/comboot.doc
@@ -424,6 +424,7 @@ AX=000Bh [2.00] Get Serial Console Configuration
Output: DX Serial port I/O base (e.g. 3F8h = COM1...)
CX Baud rate divisor (1 = 115200 bps, 2 = 57600 bps...)
BX Flow control configuration bits (see syslinux.doc)
+ -> Bit 15 is set if the video console is disabled
If no serial port is configured, DX will be set to 0 and the
other registers are undefined.