Fusion C: making MSX-DEV20 entry ROMs

Por MattyT

Supporter (13)

imagem de MattyT

23-11-2019, 09:12

I am sure this has been asked many times before, but I can't work it out. How to turn a COM file to ROM file.

Currently using the Fusion-C compil.bat file I am producing COM files. I am having fun coding games for the first time in years and I am tempted to enter MSX-DEV20.

So this is the requirement from the competition rules:
"any size will be accepted as long as it does not require a ROM mapper. In other words, the acceptable ROM file sizes are 8 KB, 16 KB, 24 KB, 32 KB, 40 KB and 48 KB"

Trawling the threads I got this advice ".com files are just programs loaded at 0x100h, so you need to include the whole program in your ROM, and write a small program to relocate it to 100 h in RAM at runtime, do a JP 0100h and that's it."
I note that the .ihx file produced out of sdcc is at 0106h, but I couldn't work out a way to follow that advice. Any tools do it?

In the compil.bat script hex2bin makes a .com file out of the .ihx file
Is there some other tool or method that can turn it straight into a ROM file?

The other method "Put your com file on formatted MSX DSK image, add MSXDOS files and autoexec.bat that will run your com, and convert this DSK to ROM using DSK2ROM utility. " I was able to follow but the ROM image is much larger than any of those allowed ROM sizes.

I also tried bin2rom, but that told me my bin file was in the wrong format. It seems to be for BASIC.

Any advice appreciated.

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Por gdx

Prophet (3224)

imagem de gdx

23-11-2019, 09:27

Fusion C is not adapted to make ROM file of sizes 8 KB to 48 KB. Fusion C is designed to make megarom from disk image.


Por wimpie3

Champion (285)

imagem de wimpie3

23-11-2019, 11:46

I've used CZ80++ for my MSXdev development. Compiles to roms without any issue.

I'm currently building a whole eco system around this compiler for usage on a PC, combined with an extensive usage manual. Not sure when it will be finished though.

Por ericb59

Paladin (900)

imagem de ericb59

23-11-2019, 16:46

Perhaps you can wait some time before submit your game to the MSX DEVS ?
I planned to adapt FUSION-C for the creation of ROMs within a few months.
It is necessary to rewrite some ASM routines. I think it's relatively easy. I just need some time.

Por MattyT

Supporter (13)

imagem de MattyT

24-11-2019, 08:49

Great Eric. I'll code away and await future enhancements.
And thanks for the other replies too. The CZ80++ thing sounds intriguing Wimpie.

Por Timmy

Expert (120)

imagem de Timmy

24-11-2019, 11:46

I've used z88dk to build roms for my MSXDev entries. Works very well.