Приставки > 4 поколение
How can I change the system of a 20-year-old cloned Sega MD2 to PAL60?(Resolved)
(1/1)
ding765:
I'm from China. I bought this cloned MD2 in 2005. It accompanied me through several summers. I played games like Langrisser II, Romance of the Three Kingdoms, New Genesis, and Uncharted Waters II on this machine. Today, I went back to my hometown and found it. It can still run, but the TV screen doesn't fill the entire screen (there are black borders). I noticed two jumper areas, K1 and K2, in the upper right corner. I tried adjusting them, but the picture didn't change. How can I change it to PAL60? Although it's worthless now, it was a part of my childhood and I don't want to lose it.
Thank you all for your replies. This is the definition of the K1 and K2 setting areas.
https://s2.loli.net/2026/01/30/Lb3XQHE1y7YmPst.jpg
https://s2.loli.net/2026/01/30/NR3XxwPVBrK91mz.jpg
https://s2.loli.net/2026/01/30/gvcmAuQBsDPKRx7.jpg
Please do not post an image with a side larger than 700 pixels using the img tag. ghostdog3
Sanyameloman:
Hi, dude :)
First of all, you need to check that topic:
https://www.emu-land.net/forum/index.php/topic,79285.0.html
Here you can find tables with information about your chip and jumper configuration. Logical "0" means that chip pin connected to the ground, while "1" means connection with +5V (or disconnected both from ground and power supply).
Depending on what generator you have on board (17,734 MHz or 14,302 MHz) choose the required format (column of the first table). For example, for PAL60 with 17,734MHz generator you should only disconnect the 4th pin of SM801 from the ground (see the illustration below for correct counting and compare it with actual position of your chip on the board - in your case you should count the required pin from the upper right corner). The should be associated jumper - please try to find it with multimeter.
Upd: There'se a drop of solder between memory chip and other details on the right side of the board - maybe that's the jumper you need, so you can try to unsolder it.
ding765:
--- Цитата: Sanyameloman от 29 Январь 2026, 23:58:54 ---Hi, dude :)
First of all, you need to check that topic:
https://www.emu-land.net/forum/index.php/topic,79285.0.html
Here you can find tables with information about your chip and jumper configuration. Logical "0" means that chip pin connected to the ground, while "1" means connection with +5V (or disconnected both from ground and power supply).
Depending on what generator you have on board (17,734 MHz or 14,302 MHz) choose the required format (column of the first table). For example, for PAL60 with 17,734MHz generator you should only disconnect the 4th pin of SM801 from the ground (see the illustration below for correct counting and compare it with actual position of your chip on the board - in your case you should count the required pin from the upper right corner). The should be associated jumper - please try to find it with multimeter.
Upd: There'se a drop of solder between memory chip and other details on the right side of the board - maybe that's the jumper you need, so you can try to unsolder it.
--- Конец цитаты ---
I tried disconnecting the solder joint, but the machine won't start. I will continue to try using a multimeter to find the switching point. Thank you for your reply.
binturong_reiko:
Now you need to track six pins of the chip: 1, 2, 3, 4, 44, and 46. All these pins should be routed to K1 and K2.
First, measure the voltage on all of these pins except 44. The solder blob on K1 is most likely the quartz crystal switch. Nope, the pin is shorted to GND. It would also be a good idea to check the VDP mode and region displayed by the 240p test suite.
ding765:
--- Цитата: binturong_reiko от 31 Январь 2026, 15:50:10 ---Now you need to track six pins of the chip: 1, 2, 3, 4, 44, and 46. All these pins should be routed to K1 and K2.
First, measure the voltage on all of these pins except 44. The solder blob on K1 is most likely the quartz crystal switch. Nope, the pin is shorted to GND. It would also be a good idea to check the VDP mode and region displayed by the 240p test suite.
--- Конец цитаты ---
Thank you. I have found the relevant pin definitions by measuring with a multimeter, and I will post them later.
Навигация
Перейти к полной версии