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F18A v1.6-1.8 does not work with Mecha 8 or Mecha 9 with SGM connected

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#1 grips03 OFFLINE  


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Posted Wed Jan 10, 2018 7:15 PM

I tested Mecha 8 and Mecha 9 with F18A firmware:


v1.4 = works fine

v1.5 = works fine

v1.6 = black screen

v1.7 = corrupted graphics  (photos below).

v1.8 = black screen


It does not matter if you are using Atarimax Ultimate SD cart or original Pixelboy cart.  Same issue in either case.


Please note SGM was connected to console for these tests.

If SGM is removed games boot ok, however without SGM sound.

Pressing reset has no effect

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#2 digress OFFLINE  



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  • Location:Toronto, Ontario, Canada

Posted Wed Jan 10, 2018 7:41 PM

I just tested it. It does work with f18a v1.8 if...you take out the sgm. But I got the same black screen with f18a v1.8 & sgm  ... and also with mecha 8 for that matter. Both worked fine if I removed the sgm on my f18a system.

#3 grips03 OFFLINE  


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Posted Wed Jan 10, 2018 7:49 PM

Not a good solution.  Mecha 8 and 9 make use of enhanced SGM audio.




  • 5,841 posts
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Posted Wed Jan 10, 2018 7:58 PM

To use a line popularized by Coleco.... "The Fun of Discovery".

The unfortunate side to all these additional hardware items is that every game that is available has to be tested thoroughly to insure full compatibility and then again everytime a firmware update is made available.

#5 phattyboombatty OFFLINE  



  • 1,110 posts
  • Location:San Diego, CA

Posted Wed Jan 10, 2018 10:36 PM

Honestly, these 2 games by OTG are the only two that I've ever encountered with this odd conflict. They are probably the only two modern homebrew games for the ColecoVision that strictly use the enhanced sound in the SGM.


There may be a correlation there.  :ponder:

#6 matthew180 OFFLINE  


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Posted Sat Jan 13, 2018 5:21 PM

Ok, so I will add this to the list of things to test.  Grips03 has done some testing of the F18A firmware revisions that work and don't work (v1.6 and above do not work with these games), but unfortunately a lot changed in v1.6.  Can anyone tell me if these games work under emulation?

#7 Bmack36 ONLINE  



  • 306 posts

Posted Sun Jan 14, 2018 9:35 AM

The rom for Mecha 8 was just released in Dec. Here it is if you need it for testing:


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