Combine 2 compiled 4k bB games?

[+Gemintronic]

I'm trying to combine 2 4k bB games I made years ago.  I have the source and tried to make sure the kernel settings and DIMs didn't clash between games.  I also tried using the 32k multikernel framework and no go switching to the 2nd game on the second bank.

 

I was wondering if I could do a DOS COPY to combine both games:

COPY GAME1.BIN+GAME2.BIN 2IN1.BIN

 

..making sure there is some inline assembly to arbitrarily jump to the second bank in the first gtame:

 

   asm

   some magic to switch to the last 4k portion of ROM

end

 

Does this make sense?  What would the actual inline assembly look like?

 

Thanks in advance for any clues, fellas!

Edited December 16, 2020 by Gemintronic

[+Gemintronic]

THIS almost worked with two copies of the same game.  When I put the source for two different games in it doesn't switch to the other bank.

 

For bank 1 the bank switch code looks like this:

 

 asm
 lda $1FF9
 nop
 nop
 nop
 nop
 nop
 nop
end

 

For bank 2 the code looks like this:

 

 asm
 lda $1FF8
 nop
 nop
 nop
 nop
 nop
 nop
end

Edited December 16, 2020 by Gemintronic