Hacking games to use ZXpand/Chroma/Other joystick

[1024MAK]

Check the write-protect setting of the files. If a file is write protected ZXpand disables the overlay ROM. Remove the flag and things will work.

I was considering removing this feature because it causes a lot of confusion. My mind is now made up! ByeBye 'feature'

*edit*

Code: Select all

        // hack to make programs auto-disable ROM if read-only attribute is set
        if (filinfo.fattrib & AM_RDO)
        {
            flags |= 1;
        }

Removed. The fact it was labelled a hack really says it all.

What was the reason / why was it added in the first place?

Mark

[sirmorris]

I wanted a cheap and cheerful way of specifying whether a program should run with the overlay disabled. I settled on R/O flag as I thought it wouldn't be used often, oh how I was wrong. Some computers evidently automatically set this flag when they write to an SD card..!

[Andy Rea]

bit OT but what about... instead of a .P file a .X file exactly the same in every way except the extension ? that way people can rename the file they want to auto disable the overlay

just a thought...

just studying the asm for your patcher, hping to learn some tricks from the master

Regards Andy

[sirmorris]

.X genius!

[1024MAK]

You two make me

Okay, as you are... (meaning keep going with the new developments )

Mark

[sirmorris]

.XP perhaps - the smiley for a loud raspberry!

[Paul]

How about .POO
Like PfileOverlayOff?

[sirmorris]

You're not helping the clichéd view that the German sense of humour is scatalogically based

[Andy Rea]

.USR

Use Standard Rom

[ilyad731214]

Your poke finding techniques should be a good place to start. As would address 22411 ($578B) which is the entry point to the machine code from the BASIC loader.

It looks like a nicely structured program.
disass.png

I'm guessing that one of these calls would be for reading the keyboard, one for updating enemies, landscape etc. Game stuff, you know.

So breakpoints will be added at each of the entry addresses. I don't want to have to step through if I don't have to. I might check out the call that has the LD HL,.. first - because that looks suspiciously keyboardish to me.

bingo!

bingo.png

Hi
Can you describe me how to do a step by step assembly directory listing? How do you make these prints?