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prefabpeti

Student
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Feb 21, 2023
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Hello all, my Naomi 2 has just started showing the checkerboard pattern when playing N2 games. N1 games seem fine.

RAM test on N1 and N2 mode are showing as all GOOD. If I hit the SERVICE button as it loads the BIOS you see the screen clear up for a moment on the N2 game. Screen looks OK in BIOS too.

Do I need to leave it running and see if the test starts to show a fault?

I feel like a bit of a fool as I was using my Sun power supply which I acquired quite by surprise instead of my Meanwell.

Starting to think N2 is more trouble than it's worth and to stick to N1!

Any thoughts or tips would be greatly appreciated.
 
Some good news, after leaving it a week or ago and doing lots of RAM tests - finally IC16 is consistently showing as BAD. N1 games have minor corruption in their graphics now.

I'll be looking to swap IC16 and IC18 - thankfully these are 16-bit ICs so a little more of my ability level!
 
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