#1 CBIOS v0.20 has problems with RuMSX V0.29

[R. Lechleitner]

Where C-BIOS v0.17 worked (almost) fine with RuMSX,
C-BIOS v0.20 has several problems:

1) boot-logo is corrupted, at least after a reboot of the
MSX. This problem has been solved in C-BIOS v0.20a.

2) the boot-logo is only displayed partially (was correct
until C-BIOS v0.19). I could not find the cause of this
problem right now.

3) Pressing the SHIFT key should activate the
debug_mode. Pressing SHIFT in v0.20 displays a
corrupted text-screen. V0.17 was almost fine, some
newer version garbled the text screen. Looking for the
cause I've found that the routine 'init_vdp' sets the VDP-
register 2 to the value 0 (PatternNameTable=$0000, but
should be on $1800). I guess VDP-register 2 should
have the value 6 instead...

4) Working around the problem (3) or using C-BIOS
V0.17 activates the debug-mode but does not have a
proper line-break. See 'cbios_debug.gif' for more
information.

[R. Lechleitner]

debug_mode in C-BIOS v0.17

[R. Lechleitner]

Logged In: YES
user_id=510093

While copying C-BIOS v0.20 for release with RuMSX V0.30 I
found another inconsistency in the provided configuration:
5) The RuMSX configuration files are specifying a japanese-
configuration (Locale=0), where the CBIOS-ROMs are telling
they are international (byte at 0x002C = 0x11).
6) The RuMSX configuration files for CBIOS MSX2/2+ are
specifying 50Hz video-refresh (VdpFrequency=1) as default,
where the CBIOS-ROMs are telling 60Hz (byte at 0x002B
has bit 7 reset)