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mygodess
10-11-2020, 08:03 AM
57987
I designed a pcb but I need to test it before I make it.
Cause I soldered via my hands.

57988
Protection with yellow plastic board.
The memory is NVRam cause I don't need to change the battery.

57989
I checked the size with real one.

57990
Ended.
This one looks a little bit strange but it works well :)

Burning Fight!!
10-15-2020, 03:16 PM
I was confused on why there was two threads but it's fine I suppose, keep making em and posting them (in a single thread preferrably!).

Do you have a Part No. or datasheet for that flash chip?

DasiyAge
10-15-2020, 08:50 PM
I was confused on why there was two threads but it's fine I suppose, keep making em and posting them (in a single thread preferrably!).

Do you have a Part No. or datasheet for that flash chip?

I also have this question and also what connector PN is used?

Digmac
10-16-2020, 12:27 AM
I was confused on why there was two threads but it's fine I suppose, keep making em and posting them (in a single thread preferrably!).

Do you have a Part No. or datasheet for that flash chip?


I also have this question and also what connector PN is used?
The model of flash chip he’s using is an FM18W08-SG.

lachlan
10-23-2020, 08:27 AM
Would it be possible to directly replace the RAM in the original with a non volatile replacement?

Digmac
10-23-2020, 08:52 AM
Would it be possible to directly replace the RAM in the original with a non volatile replacement?

I checked the data sheets between the original SRAM chip and the FRAM chip used for this project, and the new FRAM chips all have 28 pins, while the original is 24. They have the same amount of I/O lines between the two, but the 28 pin FRAM chip has 15 address lines as opposed to 11 on the original. This isn’t exactly my forte so I’m not sure if it would work by only connecting 11 address lines to the FRAM chip. Someone could try, though.

mikew
10-28-2020, 02:11 PM
I’m not sure if it would work by only connecting 11 address lines to the FRAM chip. Someone could try, though.

If you did that you'd want to ground the unused address lines, otherwise they will be floating and randomly switch high or low which would generate invalid addresses when the SRAM is read or written.

Gamemaster
11-02-2020, 12:01 PM
You can also use this one: https://github.com/neogeodev/NeoMemCard2
Adds some switch and a pretty useless LED.

Actually the design could be a bit better if the fram chip is more at the upper end (other side of the connector).