Problems with the NMS8245 and BIOS Basic 3.0

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By Pablibiris

Paragon (1814)

Pablibiris's picture

18-04-2015, 16:51

Now I understand Wink
Thanks Jipe!

By Pablibiris

Paragon (1814)

Pablibiris's picture

18-04-2015, 16:57

Ummm,I have a question,Jipe.
This Bios is for a AZERTY keyboard,right?
There are some bios for a QWERTY keyboard,with "ñ"?
Thanks

By Jipe

Paragon (1571)

Jipe's picture

18-04-2015, 17:13

i have not this version for QWERTY
you can replace the matrix keyboard on the rom , see other rom with MSX2 + QWERTY

By Pablibiris

Paragon (1814)

Pablibiris's picture

19-04-2015, 13:25

Well...I make this,and the problem persist Sad
I dont know why with the original ROM,the computer runs OK...and with a Eprom dont...

By Jipe

Paragon (1571)

Jipe's picture

19-04-2015, 14:00

i remenber the original rom 531000 is not a 64k but 128k , the pin 22 is A16 and connect to the ground in 8235/39
in 27512 signal is /G
check in 8245 this pin 22 to ground , in the 128K is 2x64k rom : 1xAZERTY and 1XQWERTY and the bit A16 choise the version

By AxelF

Champion (395)

AxelF's picture

19-04-2015, 14:22

Why do you use the extra 16k Eprom? , are the 2+ roms larger than the Original roms?

By Jipe

Paragon (1571)

Jipe's picture

19-04-2015, 14:39

yes
BIOS3 slot 0 0000H 7FFFH
SUBROM slot 3.0 0000H 3FFFH
EXE slot 3.0 4000H 7FFFH (contain msx logo)

By AxelF

Champion (395)

AxelF's picture

19-04-2015, 14:48

Thanks for the clarification Smile

By Pablibiris

Paragon (1814)

Pablibiris's picture

19-04-2015, 15:46

Ok Jipe,I checked pin 22 to ground,and the tester buzzer sounds a little bit (less than a second) and stops ringing.
Maybe this is because there are a capacitor between pin 22 and ground?

By Pablibiris

Paragon (1814)

Pablibiris's picture

19-04-2015, 16:11

Now I send this pin 22 to ground (only the pin,not the connexion in the board),and the problem persist

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