MSX2 rom flash to start with 60Hz

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By NYYRIKKI

Enlighted (5939)

Аватар пользователя NYYRIKKI

06-05-2015, 07:59

I think it should work for most MSX2 machines, but not for MSX2+ or tR.

By jpgrobler

Master (154)

Аватар пользователя jpgrobler

06-05-2015, 11:01

tx

By tvalenca

Paladin (747)

Аватар пользователя tvalenca

06-05-2015, 22:12

Well... MSX2+ and TR already boots at 60Hz... Is there any need to boot them at 50Hz other than messing with BASIC and games timming? Almost any stuff that needs to run at 50Hz already do it while booting, no?

By mohai

Paladin (971)

Аватар пользователя mohai

19-05-2015, 23:32

Hello,

Just for your info.
I have applied that patch to 8280 EXP rom and a RAM counter patch too and it works OK.
The version I patched is Spanish one with BASIC 2.1.
The issue with this ROM is that it does not show "xxxxx Bytes free" when BASIC starts, but I am trying a way to fix it.

By mohai

Paladin (971)

Аватар пользователя mohai

29-10-2015, 08:41

I managed to fix the "bytes free" bug from the bios 2.1
Seems that there is a RET, after the copyright message routine, but the rest of the code is still there. Just removed it and now I can see the bytes free at startup.
So, now I have a rom with memory counter and 60/50 hz option on my 8280.

The only problem now is thah I upgraded it to 2+. Smile
I have the Spanish ROMs for it. That suits me fine but, I still want the 50 / 60 option on it. Any ideas?

By l_oliveira

Hero (534)

Аватар пользователя l_oliveira

29-10-2015, 13:55

Take a look at this google code archive:

https://code.google.com/p/msxnewbios/

It allows you to easily customize and build BIOS from source with whatever settings you want.

By mohai

Paladin (971)

Аватар пользователя mohai

29-10-2015, 20:58

Thanks for the link.
I can be very helpful, but I do not understand how this project works.

By l_oliveira

Hero (534)

Аватар пользователя l_oliveira

29-10-2015, 21:03

mohai wrote:

Thanks for the link.
I can be very helpful, but I do not understand how this project works.

It's decompiled MSX1/2/2+ BIOS source code which can be recompiled again as:

MSX1 Japanese/USA/European with any regional settings and keyboard layout.
MSX2 Same customizations as above and special features like automatic detection of clock(date/time) chip and mapper size detection at boot screen.

MSX2+ Same as above plus F4 latch customization features.

By mohai

Paladin (971)

Аватар пользователя mohai

29-10-2015, 22:57

Thanks. I will take a look at it

By mohai

Paladin (971)

Аватар пользователя mohai

03-11-2015, 20:38

Hello,
I managed to patch MSX2+ BIOS just the way NYYRIKKI did to MSX2.
I used a Spanish ROM set from BlueMSX web.
Thanks to l_oliveira, I located a good place to patch to.
I could not find a place to make boot logo switchable too. This can be done too, but a litle more patching is needed for it.
I do not need a 50 Hz boot logo anyway.
In this version, if you press H just before logo (or before warm startup), BIOS will start to 50 Hz instead of 60 Hz
HERE is the patched ROM-EXT

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