Zaxxon - alternative rom with wF8 bankswitch format

[Thomas Jentzsch]

7 hours ago, kevtris said:

I never hacked any ROMs to make them work, except the FA ones, I added an extra empty bank with a single bankswitch to make them 16K but that was only for my own "bankzilla" use and I never released those.  I don't think I released a hacked smurfs image but who knows, it was 25+ years ago now.

This is from your own sizes.txt:  

Quote

*addendum5*
Finally figured out what was wrong with Smurfs Save the Day.  The places
in the code that switch banks was right on top of each other.  (the 
STA $1FFx instructions were at the same addresses in diffrent banks)
As a result, there were only STA $1FF8 instructions rather than both
STA $1FF8 and STA $1FF9 instructions.  Fixing these resulted in a working
ROM image!!!!!!  Now all I need is Berinstein Bears to round out the
Coleco Collection.
*end*

I suppose either you had a different version or the known ROM is from you.

Edited May 30 by Thomas Jentzsch

[kevtris]

11 minutes ago, Thomas Jentzsch said:

This is from your own sizes.txt:  

I suppose either you had a different version or the known ROM is from you.

yeah but I am not sure if that was released.  it is very possible!

[Thomas Jentzsch]

@RevEng Are these the only two ROMs affected? Or will there be more? I vaguely remember that DK Jr. had problems too.

[RevEng]

4 hours ago, Thomas Jentzsch said:

@RevEng Are these the only two ROMs affected? Or will there be more? I vaguely remember that DK Jr. had problems too.

So far just the two. But I searched the 2600+ forum and ran across this thread, which we'll follow-up on.

 

The existing 4k dump of the non-working DkJr in that thread doesn't raise a lot of hope though, as it contains a hotspot read using "LDA $FFF9".

[chad5200]

4 hours ago, RevEng said:

So far just the two. But I searched the 2600+ forum and ran across this thread, which we'll follow-up on.

 

The existing 4k dump of the non-working DkJr in that thread doesn't raise a lot of hope though, as it contains a hotspot read using "LDA $FFF9".

The problematic DK Jr was fixed with one of the dumper updates. I think it was 1.1.0.9 that fixed it. 

[RevEng]

54 minutes ago, chad5200 said:

The problematic DK Jr was fixed with one of the dumper updates. I think it was 1.1.0.9 that fixed it. 

Ok thanks. Makes sense, since the partial dump indicated it was F8 proper.

[Thomas Jentzsch]

6 hours ago, RevEng said:

So far just the two.

Judging from the model numbers/release years, it seems that they might have started with WF8 (1982) and switched to F8 (1983) later. Then we probably will not find any more such carts.