cbios_main_msx1.rom, cbios_main_msx1_eu.rom and cbios_logo_msx1.rom are C-BIOS 0.29a
(2018-09-23), an open-source replacement MSX BIOS, unmodified from the release archive
cbios-0.29a.zip at https://cbios.sourceforge.net/ (SHA-1 2f997e8a57528518c82ab3693fdae243dbbcc508,
baf2e9c69252fd9b350b488d89c71887b9d05eec and 9fbbe400dbaf186aeba42e170d9424b032412c42, as in
C-BIOS's own openMSX machine configurations). C-BIOS starts cartridges; it has no BASIC.
Its licence (a BSD-style licence) follows, from doc/cbios.txt in that archive.

License
-------

Copyright (c) 2002-2005 BouKiCHi.  All rights reserved.
Copyright (c) 2003 Reikan.  All rights reserved.
Copyright (c) 2004-2006,2008-2010 Maarten ter Huurne.  All rights reserved.
Copyright (c) 2004-2006,2008-2011 Albert Beevendorp.  All rights reserved.
Copyright (c) 2004-2005 Patrick van Arkel.  All rights reserved.
Copyright (c) 2004,2010-2011 Manuel Bilderbeek.  All rights reserved.
Copyright (c) 2004-2006 Joost Yervante Damad.  All rights reserved.
Copyright (c) 2004-2006 Jussi Pitkänen.  All rights reserved.
Copyright (c) 2004-2007 Eric Boon.  All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.