Mt777dx famiclone reverse engineering (not the popular one)

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krzysiobal
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Joined: Sun Jun 12, 2011 12:06 pm
Location: Poland

Mt777dx famiclone reverse engineering (not the popular one)

Post by krzysiobal » Sun Jan 05, 2020 2:44 am

No, it's not the popular mt777dx, this is something different. Internal shape of mainboard resembles the original famicom.

CPU (TA-03NP) clocked by the 21.xxx MHz crystal. But why there is second 26.xxx MHz crystal on the PCB with A/V/DC connectors? It turns out that it is used for the PPU (TA-02NP). First time I see that CPU and PPU are clocked by two different crystals. Probably the PCB was designed for switching between 50/60Hz, because there is even place for a switch on the PCB with connectors, but unfortunately unpopulated (and no hole in the shell).
According to this, there should be PPU TA-02NPB instead.

And nice pad with different 3 different turbo modes selection and totally discrete design (*=no turbo, **=SLOW TURBO, ***=FAST TURBO)

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