My Mega 1 has the RAM chips soldered as a dip package on the board. It's a C103277 Rev2.2.
- before.jpg (21.48 KiB) Viewed 2780 times
So I bought the same SOJ to DIP adapters Troed bought. Also got a 72pin 8MB RAM stick with 60NS chip on it for 10Euro since I probably going to upgrade another Atari. So only need 8 of the chips on the board. Some pin header strips, kynar wire and a 33Ohm resistor is also needed as well.
- parts.jpg (205.63 KiB) Viewed 2780 times
Desoldered the RAM from the motherbord and from the 8MB Ram stick.
- desoldered.jpg (57.31 KiB) Viewed 2780 times
The pin headers can't be put in as normal so you have to push them in a bit and solder them flush with the adapter board otherwise the SOJ RAM chips will not fit. The plastic strips on the header can be moved by just pressing them against a hard surface with pliers. I also sanded the adapter boards to get them to fit snugly on the motherboard since I don't want them to be tilted.
- 3 states.jpg (58.8 KiB) Viewed 2780 times
- fitted.jpg (54.31 KiB) Viewed 2780 times
Run a wire between all pin 5 (adress line A9) and pin 64 on the plcc MMU (MAD9) with a 33ohm resistor in between. It's pin 66 if you got a smd MMU.
- finished top.jpg (162.09 KiB) Viewed 2780 times
- finished bottom.jpg (172.18 KiB) Viewed 2780 times
