Small MSX1 BIOS

By Fabf

Champion (266)

29-08-2020, 22:08

Hi all
Anybody knows if exist a BIOS without basic ?
I know CBIOS but its size is 32Ko and I need a smaller one.
Thanks

By Manuel

Ascended (19687)

29-08-2020, 23:38

it's 32kB because there are a few stubs in the basic part. The second 16kB is thus mostly empty. I haven't tried, but you can probably use the first 16kB as a BIOS.

By Fabf

Champion (266)

29-08-2020, 23:52

No it doesn't work (tested with BlueMSX).

By Manuel

Ascended (19687)

30-08-2020, 00:04

What happens?

By gdx

Enlighted (6439)

30-08-2020, 02:07

If you do this, several software that use some of the routines below may not work anymore.

https://www.msx.org/wiki/BASIC_Routines_In_Main-ROM

Disk-basic no more too.

By Manuel

Ascended (19687)

30-08-2020, 10:58

But these routines are in the first 16kB aren't they?

By Fabf

Champion (266)

30-08-2020, 10:59

@Manuel : black screen

@gdx : I only want to use it with game cartridges.
It's for some experiences like Forte II Pesadelo.

By gdx

Enlighted (6439)

30-08-2020, 12:50

Forte II Pesadelo is a 64kB Rom. It is emulated by BlueMSX. Maybe it can help you. It seems not use a BIOS.
Otherwise, there is an MSX of Knightmare ROM modified to look like Forte II Pesadelo.

By Fabf

Champion (266)

30-08-2020, 14:45

Sorry, it was juste an example of game working with a modified 16KB bios.

By Fabf

Champion (266)

30-08-2020, 16:13

Just found an old topic.
This is funny, the same question for the same purpose.
https://www.msx.org/forum/msx-talk/hardware/smallest-msx-rom...