Over the long weekend after examining the dump I struggled to have this working on the actual handheld. Imitating previous attempt from my site earlier, this one is easily replicated as soldering on the 1.28mm pitch is easier!

But, when I put that ROM inside, the backlight flashed a moment and then empty screen! Yes the TFT was initialized judging by the gray background on it and nothing on it!

Out of my curiousity, and the knowledge of the previous attempts, switching on the backlight plus the display often happens when the main menu or the Aaronix test screen is starting.

I noticed that code fragment and put these onto the startup code that enables the backlight and the display together:

lda $4139
ora #$02
sta $4139
lda #$1f
sta $413f

Well, it worked!

However, the direction of the cable seemed to be going downward the handheld instead of the other one. The ribbon cables have to be folded upward so that the controller points can be exposed.

Folding that cable, carefully not jiggle the solder points some more, and made that large cut on that plastic casing (Yes I know I should use a ruler and cut this perfectly - but this would be the other topic in the future!). I even took out the jack that connects it to the TV since it occupied too much space for that thick ribbon cable:

It seems to play most of the Mapper 0 and Mapper 4 games and looks like there isn't much problem. Oh, and this is only 8MBytes of the stuff - I could use a 16MBytes but this will be another topic in the future.

Well there it is! I can finally play "Magic Jewelery" on the couch, or I can put other homebrews inside too...