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Hi, i'm pleased to share with you this mod made with Arduino !!.
I have several Arduino models at home and I thought, why not use this micro instead of buying a PIC :-).
Clones are found for less than 2€ and do not require programmers to be programmed.
If you use a clone you have to write the bootloader to program it via serial.

These are the pins used on Arduino:

Pin 6: Input from reset button
Pin 7: Output to console reset
Pin 8: Selection 50 / 60hz (PAL/NTSC)
Pin 9: Language selection EN / JP
Pin 10,11,12: Led R,G,B

Now just remove the LED and replace it with an RGB: (Click to see the tracks to be cut and the pins to use)

The reset input can be taken more easily on pin C33 under the reset button

This is how it works:
If you press the Reset button for less than 400ms;
the console resets

Holding the reset over 400ms but less than 1sec.; (the rgb led turns off)
You change the frequency 50/60hz (PAL/NTSC)

Holding the reset for more than 1sec.; (the rgb led shows the color of region)
Change region:
Green = EU (EN / 50hz)
Blue = US (EN / 60hz)
Red = JP (JP / 60hz)

When the system starts, the LED will flash once if you are in PAL mode and twice if is in NTSC mode.

I'm attaching the program for Arduino, you can use micro or nano version :-)

Asper's console just signed up for testing.[url][/url]

arduino_mod.jpg (275.31 KB)

Arduino pin

md_pic1EN.jpg (1.68 MB)

Mod_image

md_pic3.jpg (333.97 KB)

Mod_complete

MDrive_SW.zip (2.47 KB)

Arduinio source code

[ Hello, Please do not use external image link (see http://www.smspower.org/forums/17232 to understand why). Could you replace your images with proper attachment? Thank you! ]

Bock wrote

[ Hello, Please do not use external image link (see http://www.smspower.org/forums/17232 to understand why). Could you replace your images with proper attachment? Thank you! ]

OK, changed!.

Thank you so much, sorry for the trouble! You can use img tags to then embed images. It's a little more work but it ensure the useful data will be avail for the lifetime of smspower :)

[img]http://www.smspower.org/forums/files/arduino_mod_301.jpg[/img]

Bock wrote

Thank you so much, sorry for the trouble! You can use img tags to then embed images. It's a little more work but it ensure the useful data will be avail for the lifetime of smspower :)

[img]http://www.smspower.org/forums/files/arduino_mod_301.jpg[/img]

Thanks, you're right I didn't know you could link the attached image.
The system renames the inserted file and the correct link must be taken from the image
EG: http://www.smspower.org/forums/files/md_pic1en_131.jpg

Author	Message
zeus074 Joined: 03 Aug 2019 Posts: 7	Mega drive 2 switchless mod with Arduino Posted: Fri Aug 16, 2019 2:28 pm Last edited by zeus074 on Sat Aug 17, 2019 8:28 am; edited 4 times in total
zeus074 Joined: 03 Aug 2019 Posts: 7	Hi, i'm pleased to share with you this mod made with Arduino !!. I have several Arduino models at home and I thought, why not use this micro instead of buying a PIC :-). Clones are found for less than 2€ and do not require programmers to be programmed. If you use a clone you have to write the bootloader to program it via serial. These are the pins used on Arduino: Pin 6: Input from reset button Pin 7: Output to console reset Pin 8: Selection 50 / 60hz (PAL/NTSC) Pin 9: Language selection EN / JP Pin 10,11,12: Led R,G,B Now just remove the LED and replace it with an RGB: (Click to see the tracks to be cut and the pins to use) The reset input can be taken more easily on pin C33 under the reset button This is how it works: If you press the Reset button for less than 400ms; the console resets Holding the reset over 400ms but less than 1sec.; (the rgb led turns off) You change the frequency 50/60hz (PAL/NTSC) Holding the reset for more than 1sec.; (the rgb led shows the color of region) Change region: Green = EU (EN / 50hz) Blue = US (EN / 60hz) Red = JP (JP / 60hz) When the system starts, the LED will flash once if you are in PAL mode and twice if is in NTSC mode. I'm attaching the program for Arduino, you can use micro or nano version :-) Asper's console just signed up for testing.[url][/url] arduino_mod.jpg (275.31 KB) Arduino pin md_pic1EN.jpg (1.68 MB) Mod_image md_pic3.jpg (333.97 KB) Mod_complete MDrive_SW.zip (2.47 KB) Arduinio source code

Bock Site Admin Joined: 08 Jul 2001 Posts: 8652 Location: Paris, France	Posted: Fri Aug 16, 2019 3:54 pm
	[ Hello, Please do not use external image link (see http://www.smspower.org/forums/17232 to understand why). Could you replace your images with proper attachment? Thank you! ]

zeus074 Joined: 03 Aug 2019 Posts: 7	Posted: Fri Aug 16, 2019 4:18 pm
zeus074 Joined: 03 Aug 2019 Posts: 7	Bock wrote [ Hello, Please do not use external image link (see http://www.smspower.org/forums/17232 to understand why). Could you replace your images with proper attachment? Thank you! ] OK, changed!.

Bock Site Admin Joined: 08 Jul 2001 Posts: 8652 Location: Paris, France	Posted: Fri Aug 16, 2019 5:13 pm
	Thank you so much, sorry for the trouble! You can use img tags to then embed images. It's a little more work but it ensure the useful data will be avail for the lifetime of smspower :) [img]http://www.smspower.org/forums/files/arduino_mod_301.jpg[/img]

zeus074 Joined: 03 Aug 2019 Posts: 7	Posted: Sat Aug 17, 2019 8:33 am
zeus074 Joined: 03 Aug 2019 Posts: 7	Bock wrote Thank you so much, sorry for the trouble! You can use img tags to then embed images. It's a little more work but it ensure the useful data will be avail for the lifetime of smspower :) [img]http://www.smspower.org/forums/files/arduino_mod_301.jpg[/img] Thanks, you're right I didn't know you could link the attached image. The system renames the inserted file and the correct link must be taken from the image EG: http://www.smspower.org/forums/files/md_pic1en_131.jpg

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