Combine Two 4k Games Using F8 Bankswitching

[+Gemintronic]

Hello!

 

I'm trying to copy two 4k games together and launch the last game from the first 4k game using F8 bank switching.

 

I used the DOS/Windows command prompt to combine the separate binaries:

 

COPY /B /Y bank1.bin + bank2.bin f8game.bin               

 

I had partial success doing a:

  LDA $1FF8

 

But the second 4k game does not appear to start cleanly and appears soft locked.

 

Any clues as to what I'm missing?

 

[+splendidnut]

The most important thing when switching banks is to make sure you know where you're going to end up.

 

If you want a "clean" start after bankswitching, you'll probably want to do a:

  JMP ($FFFC)

 

...to execute the reset vector of the second game.  That jump instruction should be done immediately after the LDA $1FFx,

BUT it'll need to be located in the bank you're switching to, at the appropriate address.