Mega Drive 60Hz mod with switchable PAL 4.43MHz or NTSC 3.58MHz

I've done a Mega Drive 60Hz but different from what I've seen around.
First I've done the 1 switch region mod following this tutorial:
mdpal60.net/wik...
Then I installed a 3.579 MHz crystal to the Mega Drive to allow NTSC colour on 60Hz.
Component installation (of one system only you must follow the link below for a dual system installation):
www.mmmonkey.co...
I used a SPDT switch to choose from the original signal (Mega Drive's own 4.43 PAL and the added 3.58MHz crystal.
Unlike the other mods you DO NOT BRIDGE PIN 7 TO GROUND on the encoder chip, we wan't it to switch between PAL and NTSC when selecting 50 or 60 Hz.
The result is true PAL on 50Hz and true NTSC on 60Hz also the switch allows me to disable the crystal when using RGB to avoid interference.
Schematic:
s15.postimg.or...

[@t0nito]

@Prosmerian I didn't mod the main oscillating crystal I added both a 3.58MHz and a 4.43MHz crystal to the video encoder chip with a switch to switch on one or the other, I also added another switch to force the encoder to do PAL or NTSC. Read the description, it's all there.

[@daniel070487]

there is something wrong with ur mod...50 hz no black beams and in 60Hz the sound is still slow...

[@t0nito]

Nothing's wrong, some games don't add black borders, normally the border is the same colour as the background, if you look closely they are there. Sound is indeed faster on 60Hz, turn on the annotations to understand what's going on. My mod has 2 crystals (3.58 MHz and 4.43 MHz). My system is capable of 4 systems (plus RGB) PAL 4.43 / PAL 3.58 / NTSC 3.58 / NTSC 4.43

[@zummone]

This is pretty amazing, and much less complex than I figured it would be.
What's with the different volume levels though? I hope those are not side effects of the mod.

[@t0nito]

zummone No, that's the TV it has always increased the volume in NTSC mode for some reason

[@waltercomunello121]

don't know if you're still reading comments, but I've got one question. On composite LCD a dual oscillator mod gives good PAL signal but on NTSC, while colors are correct and the mod generally works fine, there's a crazy amount of horizontal dot crawl and horizontal ghosting in the bottom part of the screen, littering the image. Using a PAL Mega Drive 2 unit, VA1.8, encoder is the Fujitsu MB3514. I wonder if it's an issue about different passives (filters?) across Mega Drive and Genesis, or if it affects the encoder. I also wonder if it's related to the LCD, and if on CRT it wouldn't be recognizable, or it wouldn't happen at all.
Works flawlessly otherwise.

[@t0nito]

Are you using dual main oscilators? My mod bypasses the internal chroma signal completely and I use independent 4.43 and 3.58MHz crystals.

[@NyaNyaLily]

Question, will this mod also raise the master clock to 53.6931Mhz when set to NTSC?
Meaning that it will actually run at 59.9hz when set to NTSC instead of 59.3hz?

[@t0nito]

No, this only affects the chroma frequency, master clock is untouched.

[@intel386DX]

can this be done without separating the 2 ICs legs and also use 4 pic oscillator rather then 2 pin crystal with additional components ?

[@t0nito]

The main oscillator remains, I added a separate 4.43MHz and 3.58MHz crystal to the colour demod chip

[@intel386DX]

@@t0nito I made the MD2 mod by only adding the additional 4 pin oscillator (3.5M) in my case, and only one cut one trace fowling this guide ruclips.net/video/90scC8EhPqc/видео.html
but I can not find the scheme for model 1 without lifting the ICs legs :( I do not want to lift any legs at all

[@NyaNyaLily]

The link to the image is dead.

[@t0nito]

I added a new link (not mine) in the description to have an idea of the components and I made a new schematic and fixed the link to it.

[@NyaNyaLily]

thanks

[@Angryhelder]

@@t0nito Think you can reupload the image again? Dead in 2022

[@intel386DX]

@@Angryhelder yes I want this scheme too !